I've personally seen a metal roof installed directly on the shingles, had been there 35 years. The bottom looked like the day they laid it down. Architectural shingles underneath as well. That roof is now 50 us years old and still brown. The color held up very well considering the age. Was likely a simple latex polyester
I agree also. Big companies have sales quotas to meet and want to sell you the whole package to make more money. I seen a 30 plus year roof over shingles and still in good shape
@@YOUARESOFT. I would add a vapor barrier (synthetic udl) it's cheap and keeps the paint warranty valid through the manufacturer. I was just stating what I've personally seen and been in the family metal business 30 plus years
On existing shingles.. If no leaks.. 1/2 lap felt . 1/4" fan fold foam. 2" screws and metal of choice.. I have several 30+ year metal roofs with no leaks and no problems , they are exposed fastener roofs. After the first year , a fastener inspection is always mandatory for my roofs . Just the odds that a few will land on a decking seam and work loose . Sales men are clueless to what is going on ( most of em).
Hi Keith! My existing tar shingle roof on my garage is from 1977 and I want to do a standing seam metal roof over top of it. If the plywood decking is in good shape, am I ok to do this? Or based on it's age, should I be replacing all the decking?
Don't listen to them. They are high. Put down some felt paper right over your shingles. Trim all the overhang off the shingles.( I popped a chalk line and cut the overhang with a skill saw on shallow setting.) Let metal roof overhang about 2 inches. Go to town installing your metal roof. Oh yeah, be sure to use 2 inch screws. And do a watertight job with the flashing. The metal roof plus the shingles underneath add some additional insulation value to your house. Mine is 10 years with no leaks. Did it myself. FYI . I had bad leaks before I installed the metal roof. You can do it with strips of wood but the name of this video, Is can it be done? Yes, it can be done. P.S. I hate people that talk in circles and confuse the listener. Most people are looking for a simple Direct answers and to stay on topic. ( it ain't rocket science )
I’m actually thinking about doing the opposite. I have a metal roof that’s leaking. I want to put shingles over it. Can it be done. I’m going to do it myself. I live in a trailer home.
You basically put a bandaid over it and didn’t resolve the issue. If there was a leak then there is wood damage that wasn’t fixed and now when you go to replace the metal roof it will be 2-3x as expensive since there will be 2 layers to remove and even more wood to replace now. But hey, who wants to think long term just slap a barn roof over it. Because that’s what metal roofs are for- barns.
@@cohco9320 It is called a Roof Over, poles 4x6 or 5x5 alongside the trailer 2 x12 career and a rafters decking and shingles over the trailer , You can not add anything over a metal roof on a trailer . It will not hold a load . By chance if you have a plywood deck you could remove the metal and use shingles on the trailer if it is not 20 years old or older. I seen Trailers that come from Florida to Missouri only had 2x2 rafters 2x4 walls . shingles 10x10 sq foot 220 pounds, metal 10x10 foot sq 60 pounds .
@@cohco9320 much easier to build a 2x4 frame and screw the r-panel to the frame that is setting on top of the trailer. Be sure to tie it down though or it will be like a kite in the wind.
First, I would offer my opinion that it is always better to strip a roof before any reroof, for all the reasons stated, but especially for the ability to do a proper inspection. However I personally feel that the issues raised are generally overstated. I have never hesitated to do standing seam over one layer of resonably flat asphault shingles. You are only adding perhaps 1/3 the weight of a asphault roof so load is not an issue in most cases, and will in most cases be less if you are in snow country because the load will be released when the snow slides.I don't quite agree with the emphasis you have placed on moisture issues. The small amounts of moisture that may accumulate under a metal roof(residential anyway) will easily dissipate quickly under normal conditions. The problems arise when exccess moisture is being created in the living space and not being dealt with properly.Common issues in the northeast where I live? Wet cellars is a very common one, propably the worst in residential. Drying firewood in the house.Hot tubs.Large families(lots of showers, baths, etc.).And of course a leaking roof , due to improper installation or age. All these things get a lot worse in the winter when that excess water can become frost and accumulate to pretty significant quantities.Often you can't get rid of that kind of moisture with a vented ridge cap or gable end vents.My point is if you eliminate the cause of the excess moisture that solves the issue more easily that trying to mitigate it .In other words, fix youe cellar, vent baths propery, etc. . I always use a slipsheet no matter what I go over. But again I think you might be overstating the issue of laying the metal panels directly over shingles. The given reason is the expasion and contracton causes abrasion to the contact service. But really, you make it not like there's theres someone under there with a belt sander! I have removed many metal roofs that were installed directly over asphault and never have encountered evidence of this issue. What is the coefficient of expansion on a 25 foot panel, maybe 1/16 of an inch spread over 25 feet. It would take a thousand years to wear through.But I personally love the new synthetic barriers; they're cheap and I always use them. Having said all this I do not really disagree with any that you have said.Yours is the safest plan of action.I recently did a reroof that had rolled roofing/wood shakes/asphault(yes, asphaut over wood shakes)/asphault/ and the customer actually wanted to go over all that with standing seam to save what I knew was going to to an expensive strip.I simply refused and they took my advice, but that sure shows how extreme things can get sometimes. But often you can look at a job , say this is not going to be an issue in this particular situation and you can save the customer some money. Anyway , thanks for the informative video.
Thanks for sharing wow. So you would say it's OK with metal over shingle given that it's fairly even and free of bulging spots? Also you mentioned about synthetic barrier which brand? And I saw lot of people do 1x4 wood trip framing over existing shingles and attach metal roof on that wood grid they created. Is that not recommended?
@@JJ-pf7qo It's hard to give you aspecific answer, but I install double lock standing seam which is in a category of it's own . If you are thinking snap-lock or screw-down (exposed screw fastener) then strapping the roof may be a requirement for going over old shingles. It would be a requirement for a screw down roof as the screws will leak if they don't go into a hard surface. Snap-lock may be a case where the manufacture may also require purlins installed over shingles to honor warranty for their own reasons. If you have substrate issues(water damage,etc.) you really should strip it. So I never meant to say go over every shingled roof. just that there is no reason in my opinion not to go over them just because they are there. If I go over them with my standing seam thay have to be in pretty good shape. With strapping you've got a lot more flexability . As far as membrane every lumber yard or metal supplier has a selection and basically all are sutible these days for metal underlayment. I use Rhino roof a lot, and also the more expensive Roof top guard. Also keep in mind that if you go over shingles you can't install a water and ice shield barrier menbrane if your in ice dam country like I am. With double locked standing seam I seal the seams top to bottom with caulk but this would not be possible with screw down or most snap locks as far as I know.
been there done that....1937 house...tore off one layer of asphalt shingles to find another one underneath, tore that one off to find the original roof material of cedar shingles.....doubled strapped (1x4s) over cedar shingles...first layer vertical, checking/adjusting for plane, second layer horizontal, creating a good airspace. Next was tar paper laid vertical with half overlap (uses more paper but makes handling the panels with no possible damage to paper way easier) I installed this 6/12 pitch roof singlehanded! The panels were 3 feet wide "M-form" predrilled on the ground to a 18 inch diamond pattern. That was 16 years ago and I couldn't be happier with the roof.
My shingles roof is set on metal 2X3 steel. the shingles were recently painted with Lanco Siliconizer to seal the shingles, which are about 8-10 years old. roof looks fine, a couple of spots have been replaced due to plywood rot, but 99% is fine. Considering the shingles have been painted over with silicone-based paint, can I place pre-painted, ENAMELED (both sides) Steel roof directly on the shingles ?
When you use one by four strapping over the shingles nailed directly into each rafter, it creates a completely new deck and every screw is installed into a fresh piece of new wood. That is the only way to go. If you screw metal directly through shingles, you have no idea what you’re screwing into underneath the shingles. Strapping eliminates that issue
Also the bottom of the roof deck gets scratched exposing bare metal on the bottom creating a spot to rust quicker, air gaps are also a common part of the insulating properties. Also furring allows a space for insulation to be added.
Question regarding roof vents on an existing shingled detached unheated garage. Decking in perfect condition, 12 years old. Wanting to strap 1x4 and roof over but roof has 2 roof vents on each side of the roof at the ridge Simple gable ended roof). Can I simply roof over them or do they sell metal style roof vents for rib roofing? Thank you. Location Ontario Canada.
The right way to do it is the same as how solar panels are applied, using a few inches of air space. This is what the advantage is. So just have large metal panels vs the small solar panels, and this basically shades your roof. Its not rocket science, just practical fact of sun vs shade and reflectivity vs conducting and radiating heat. Just make sure you make the air gap large enough to make clearing leaf build up easy. What you will also consider doing is deadening the metal from underneith. This will help make it quiet when it rains and with wind. This gives me an idea!!!
carport has shingles that blow off and want a metal roof and guy wants to put 1x6's up and attach metal roof to 1x6's .It is only one shingle roof on it .I live in southside VA ,up on a hill and it is always windy here
Need to strip the entire roof, (several trips to the landfill (30 miles away)), ice shield entire roof ( very expensive), 1" strapping at recommended spacing and valley flashing. Then all the pricey metal gable and eave moldings, etc. and then the metal roofing of course. My roof deck is mint so I think I'll chance the "over the shingles" method.
Very true installed metal roofs in Austin. Installed every roof stripping all the shingles and phelp then put the ice shield. I believe if your having a leak or something that’s is already weak just adding weight to the problem
There is a downside to tear offs. Mostly with smaller crews,they might tear off Thursday n Friday. Rooftop delivery comes Monday with fell paper , weather shield,drip edge. If it rained over weekend the truck is still coming. Hey guys the roof is dry enough, get to work. Hey boss how is the plywood ever going to dry? When it rots we get another job out of it. I would imagine this could happen when your metal roof guys show up.
I bought a old farm house with standing seem over shingle over wood shingle. House caught on fire. Fire department showed up and had to strip most of the steel off before attacking the fire. Normally they would simple knock a hole in the roof to allow the flames to go up instead of climb the roof inside. But because the medal was over all that it just made it hard to attack. Once the medal was off and the roof was opened up then they could drop water in from the top down. But by that time the damage was done. In that region if it was a normal standing seem it would be medal over wood slats. Again if it had a house fire it would be easier to punch holes and vent the fire because there wouldn't have been near as much fuel sitting directly under the metal.
Rod they could have axed a hole in the steel the same as a wood roof . was it a Rule Fire Department or a City fire department , Volunteer firefighters ? Volunteer and Rule are not as well trained as City . I live in Rule and if I have a Fire my house would be gone by the time they get to the fire . 45 minutes and they have to haul water from the creek 15 minutes away for the pump trucks . was not about the steel roof it was the lack of knowledge firefighting . ;)
@@John-ze3vo Thanks I still spell words that have the same meaning wrong where and were rule and rural . One of my draw backs ADD in School in the 60s 70s .
As with everything else on the internet, no simple yes or no is found. Simply put, yes, you can put a tin roof over shingles. I recently purchased enough tin to roof my log cabin in the mountains of NC and the company I purchased my tin from told me about the liner I needed. It is basically Tyvek. It gives you a heat barrier.
What is your recommended to put a metal roof over a shingle roof 40 years it's house? Because I want to change of this year please let me know soon ASAP
We recommend removing the old shingles before installing the new metal roof. It allows you to fix any decking issues, address ventilation problems, apply a new dry-in, and minimize the potential for oil canning. -Thad
We have a cabin that is used only in the summer. It is uninsulated. Inside the cabin we look up and see the decking and framing/joists etc. CAN WE INSTALL THE METAL ROOF RIGHT OVER THE SHINGLES? OR DO WE NEED TO USE 1X4's (FIRRING / STRAPPING)?????? Please settle this argument we are having within the family. This is a fly in cabin, and we can not get a contractor out there, so we will be doing it all by ourselves this summer. We need guidance! Thanks.
Install roof panel from the peak to just below the opening, install the remaining panel below with a u shaped cutout keeping in mind to go underneath the top panel at least 6". Install vent and the vent flashing.
I'm putting in vented ridge cap and deleting the roof vents. Also running flex vents up to the ridge cap. Don't know if it's "right" but most modern construction uses vented ridge roofing.
One of the best things about a metal roof is the thermal properties. Metal cools down much quicker in the evening, keeping the house cooler in the summer. Asphalt has a lot more mass and holds heat longer. Covering asphalt with metal roofing defeats this significant benefit of a metal roof. This is enough reason for me to remove the old roofing.
the answer is yes, but make sure you have ventilation, such as 2X4 strapping and the barrier, such as the radiant barrier, on top of the existing decking, in this scenario the shingles. I am gonna do it.
We live in Atlantic Canada. Damp and wet and boat loads of snow. Our camp has had Metal. Right on the shingles for Decades. We left the ends open and the cap has room for air flow. We also have solar panels on the roof and a wind mill. It's been great for 20 years. We haven't had any of the issues these people are talking about. The roof is light grey to reflect the heat. We also have a solar heater box that we use a sheet of the same color. To cover in summer. A light grey roof will reflect the heat.
my house was built in 2004 and only has 1 shingle roof but lots of exhaust vents for 4 bathrooms and 1 for the heat pump and a metal chimney and the big round roof vents that are for the attic .I see here the seem to cut the bathroom exhaust vents and to me that traps moisture between the shingles and the metal .I don't want that .I live in southside va 15 minutes from the nc border .My house is 2x6 studs with 4 feet of blown in insulation in the attic .I want to have shingles torn off and the waterproof membrane put on
All metal roofing panels are installed on strips of wood that is screwed down to rafters and decking. The answer is YES you can and like 20 houses in my subdivision did it over existing roofs. And NO you don't need any underlayment because you still have your old roof that will be doing the exact same thing and more. (LOL) Condensation? Nope again; the wood strips allows air to flow under the metal panels. Hot air rises! They are intentionally trying to confuse the audience by going off on tangents about bullshit. 10 - 1 says they all work in sales positions and have never installed a metal roof in their lives.. (ehhe)
if i wanted to extend the roof to add an over hang on a gable roof could this be done by using the 2x4 strips that are nailed down for the metal roofing. I assume there it would work just not sure if it would be frowned upon or if Im missing anything.
What about metal shingle roofing? I don't think they have any wood strips underneath them... Would it still be fine to install metal shingles right over them?
Just had Hy Grade Roofing install a metal roof at my house. Worst decision I could have made. They promised to install the roof in 4-6 weeks, of course they were late. When they finally showed up without the proper equipment and damaged my property. They are really proud of the “Quality Audit” that they do, but of course they won’t give you a copy of the audit…lol BTW -the “Quality Audit” they did at my house consisted of 2 guys coming over to pickup the leftover junk they left at my house for a month. They never even went up on the roof! Save your money use someone else!
Good info. Novice roofer here. I didn't know...what I didn't know. The cooling and retaining heat issue, I think, is a big one for me. Answers my question. NOT the best Idea.👍
Put your metal roof on. Just don't seal up the caps. It will breath just fine and last well before you are dust. Only metal roofs the "blow off" have wood planks underneath. Never seen direct to one layer roof have problem unless incompetently installed.
Yes you can put metal over shingles. Make sure you have a 3 tab roof. If the shingles are curled simply cut the tabs off. Nail synthetic felt over the shingles for a vapor barrier.
This would be the way it should be done, but sometimes the cost of repairing what existing damage is revealed after removing the shingles, may lead to replacing a full roof. I know it's best to do it right, but, for me who totaly is living on Survivor Benefits, I'm shortcutting , by placing tin roof over all of it. Please don't take my advice. As later, I'm sure it have to be do e right. Like, repairing first. I'm in a great need of a roof repair, but, with my income, I would never be able to afford it. A tin roof, is in my wish list.
I have a 100 yr. old house,, before I bought it someone installed a metal roof but were smart about it,, they removed all of the old roofing right down to the rafters, installed new Decking, and then installed the Metal roof-- I’m extremely thankful they took the extra and more expensive steps because I would NOT want 2 or 3 old shingle roof’s doing who knows what underneath a brand new Metal one....
what about 1 vertical board layer screwed to the stuctural wood, then some 1x4s horizontally over the top of that? assuming the screws are flexible and not brittle, of course, like #12 5" stainless screws.
One of my concerns would be the weight of metal installed over shingles, i know its common to have two layers of shingles which would be heavy. So how heavy is a metal roof compared to shingles? I currently have only one layer but would prefer to tear them off before installing metal especially considering how soggy the ground can stay for extended periods here, I have enough problems keeping the house leveled and out of China without adding even more poundage on top of it all
Actually a metal roof is lighter compared to a shingled roof. On avg metal roofs weight 1.4lbs per square foot compared to 2 to 5 pounds per square foot. I'm getting ready to install a metal roof over my old single layered shingled roof.
One thing they don't mention about a roof over is that if ur new roof leaks, u have ur original (no leak)? roof under it. I think many contractors want to reduce liability and charge more for a tear off first? Tear offs add a lot of costs but if ur rich, go for it. It usually boils down to ur budget.
Daveat191 26 ga roofing will hold 300 pounds at 2 foot centers I weight 200 and walk on my roof . I have built over 50 pole barns and roofed many homes with steel , homes 10 years old 15 # felt over the old roof no furring , older than 10 I use furring strips 1 x 2 every 2 foot . you can walk on it . roof over 20 strip it first and use underlayment . homes with 2 layers of shingles strip it .
@@JCcanU How much do you find it can save you? The application + materials of the furring strip VS. strippping the roof and disposal. 1/3 the cost for that part?
@@vincentcummings5508 if the roof has 2 layers or more asphalt shingles you want to remove them , in Code area they do allow up to 3 layers , other code only 2 . Heavy snow belt . Landfill charge by the ton plus the labor to strip the roof if the roof is in good shape not buckled sunk between truss not all wavie I will apply right over the asphalt shingles . when its all wavie I use fur strip . 150.00 $ a ton 3 ton =450.00 and 4 guys 20 a hour 4-8 hours to strip 640 =1090 $ furring 1.50 ea x 140 = 210 $ saving 800 bucks, Not counting fuel and time going to the landfill . I have used a dump truck 400 bucks plus the 100 in fuel landfill is 100 miles one way . I try to keep my caust down unless it has to be done.
I am so confused as to what to do. I have had 4 different companies come out. Two told me that metal over shingles is no problem. The other two said it's best to strip the roof. I have two layers of shingles. They are clearly worn out and curling. They are very brittle and easily snap. I luckily do not have leaks yet. Two companies said the weight shouldn't affect anything and the old shingles mean nothing. The other two companies said that removing the shingles is best for air flow. Any moisture will cause rot under the new metal roof. What are y'all's opinions?
We maintain that removing the old shingles is best practice because it gives you the ability to identify any problems and ensure that the substrate you're attaching your new metal roof to is the best it can be. The companies that suggested shingle removal are right in that if there's moisture trapped in the existing materials, it can cause rot and damage. If you want further clarification on this please let me know! -Thad
You can but the true its not gonna be ok maybe some people like it but to me its better to remove the shingles and we have to fix wherever we need to fixed so to me its not right to put a new roof and hold playwood it's bad
Everything we have watched on your video talks about proper installation. We are located in southern New Jersey in a high wind area. We definitely want a metal roof but where can we go to find a contractor that is truly qualified to install metal roofing. Those that we have found say they are qualified but how do we know for sure? Can you give us any guidance that will keep us out of trouble.
Hey, Carol, great question! Awesome job doing your due diligence before deciding on your contractor; it's the first step in any successful roof installation. Here are some ideas and things to think about during your search: A qualified contractor needs to have references, appropriate licenses/insurance, proof of experience, and positive reviews. Check out some of their previous work online or in person, make a phone call to a couple of their former customers, ask at the Better Business Bureau and your state-affiliated roofing association about them and their work. Here's a blog article you can check out about finding contractors: bit.ly/finding-best-metal-roofing-contractors And here's a clip from a Q&A episode we did on the subject as well: th-cam.com/video/DrJiEO3UmDk/w-d-xo.html Lastly, if you want some questions to ask a roofing contractor yourself about their qualifications and your project, download this free checklist of questions here: bit.ly/contractor-questions-checklist I hope this helps, and please let me know if I can do anything else! Once you find someone, feel free to let me know how your experience went. I'd love to hear about it! Thanks for stopping by and dropping your question! -Thad
@Sam Radowick If you don't want tpo strip the roof or any contractor that sells a job without removing the shingles are just flat money grubbing greedy contractors that have nothing but thieir own pocketbook in mind and not the quality or lifetime of the roof They use excuse of why charge the customer more and pretend to act like its the customers pocket book they are protecting but in the long run that saved money goes into the contractors pocket . Ive sold hundreds of roofs metal shingle TPO hot mop torch and every kind of metal u-panel r-panel 5 vee standing seam with clips without clips 3 tab 20 yr 3 tab 25 tr architectual 30 yr 50 yr and lifetime and out of all those applications not 1 manufacturer will stand behind not 1 of their roofs installed over another roof . So find a legitimate contractor that will do the job right and compare apples to apples . sure you may get a cheaper metal roof price but are they using 24 guage flashing or 26 are they using lifetime screws or the cheap ones that back out after 10 15 yrs . are they installing your new roof over existing shingles etc. its the little things that matter . And finally check the codes where you live and check with your insurance.. Would hate to have to remove that roof and reinstall it because of a guy who claims to have been doing it his way for 20 yrs and never had a problem !! I can say this doing it the correct way and Ive never had a recall and offered 10 yr warranty to boot thats over and above local 3 yr warranty from competition and 5 yr on liable issues from court on workmanship ..
@Sam Radowick Nothing political here im just saying the cost of removing the old roof however minimal it could be compared to the overal cost of the job should not dictate the proper way to put a roof on . However if leaving the shingles on is the way a person wants to do it when putting the metal roof on i think that 1x4 latting or nailers should be fastened to rafters with a ring shank nail every 24 inches to attach the panels to . Thats my opinion that worked in my grsat state of Texas thanks for your input as well . But to tell the truth you said alot but never said anything . What i learned from you is that the 7th nail must be a waste which the 5 and 6 could be too if nailing to a good deck not plywood . And seriously ive never heard so much crying abour removing a roof on a roof job . Isnt that the whole reason your there because the roof is leaking or has failed . But by god removing it makes no sense . I call BS . The only roof i would think to leave would be a total retrofit over say a spray foam mess .. my opinion
@Sam Radowick lol. Overkill thats a term that is debatable . My grandfather had a saying and yes he was a wiseman . Never seems to be enough money or time to do the job right the first time . But isnt it funny how there is always enough time and money to go back and do it over .. overkill is not using upgraded screws instead of cheap two piece screws that back out after 15 years and leak . Overkill is not using 24 guage flashing on all metal roofs so that you dont have to warehouse 24 and 26 and hope the right ones get put on your 24 gu standing seam so a better way is to purchase all flats or coils 24 guage and you insure quality on all roofs and uts a extra selling point for a screw down 26 guage job bonus 24 on the flashing .. over kill is a term used by people that tend to shave corners instead of operating smart . Large ir small when you have been a roof project for 14 months and you go to get your final check and nothing is on your punch out list to collect that check u did something right and i promise my name will stay in good standing .
Yes you can, but it is not advisable on a wood shingle or shake roof considering the cost of the metal and how you want it to look when you're done. If you do then you must lay down 2x4 skip sheeting that would be nailed to the rafters with 16P ring-shank nails for a more sturdy sheeting. If you use 1x4 skip sheeting your steel may look warped, and or puckered because wood shingles or shakes do not lay flat. If your question is about laying it over Comp shingles, then all you would have to do is lay down 1x4 skip sheeting. The comp shingles should be sufficient to act as a moisture barrier.
Better to roof over shingles. When I attach 1x4 I screw into rafter. I measure for location. Test with screw first I hit rafter 8/10 times. When I miss then reset till hit. Once that is done then attach roof to 1x4’s. The shingles add thermal mass and one more layer of water protection. Roofers that strip roof is looking to make more money. If roof is wood shingle I would then strip to allow for more even application.
You would think in 2021 instead of using the wood for decking that gets weak/starts deteriorating after 20 years they could come up with a lifetime osb type sheet that is reasonable in price. Think it is more a money maker, so you have to spend. A better waterproof synthetic roof decking would be much better. I been in same house for 21 years and about 15 years in, my decking was going bad in different spots, took around 15 sheets. Now 6 years later I can see a couple spots looking wavey. I want to do a metal roof on new house I am buying in a couple weeks(will be needing roof within 2-3 years), cost is complicated, so hopefully I can afford it.
I appreciate the fact that u guys spent your time to answer questions here on this topic,However when guy says one shouldn’t metal roof over shingles over shingles over shingles it kind of implies people are idiots and some are,I would hope there are few people(if any) that would put shingle over shingle over shingles the way he said that was very condescending!!!Fact is if those companies that do metal roofing didn’t charge an absolutely absurd amount of money to have this wonderful procedure done!!!I am not trying to be insulting,but let’s face it though there has been huge efforts made to bring this procedure to market those efforts(engineering,product development etc) has been paid for I’m guessing a thousand times over and again,and it sure seems by the outrageous amount roofing companies charge they’re trying to STILL hit the customers with every single pricing overage that is possible,while justifying this tactic by insulting other companies installation practices,workmanship etc(wether true or not)while at the same time glorifying their own as a means to jack consumers for their products!!!It seems this is the American way to do business anymore,and honestly it makes me sick knowing it,Everyone wants to maximize profits,and there is nothing wrong with that,but to take full advantage every single time is corrupt!!Ive always felt that when you offer a quality product and apply it with workmanship based in nothing but good old fashioned pride,knowledge and the fact that you appreciate those who are paying you money theyve(usually)worked hard to obtain,you gain a customer for life one who you don’t have to ask to refer your company but instead because you’ve given him a job well done for a price he’s not going to hear a month later when telling people about said job is twice if not more than he should’ve paid,that person will get your company work based off all those things I’ve mentioned!!!
The elephant in the room is what does the code require. If the code says do a tear-off then I'd do a tear-off. No one wants to be liable for damages caused by not following the code.
I am in the business and I installed my metal roof over my shingles. I have a roof under my roof. As they explained, it is not a good idea in every situation. Many things must be taken into consideration and the install has to be done correctly. You can completely strip a shingle roof, buy high grade materials, then have it installed by lunk heads and mine over shingles will out last it. High grade materials + Installation Expertise = A metal roof that lasts and lasts!
Dirk Diggler -Thx. My dad (Pennsylvania) has an old 1930-40’s style asbestos shingle (look like concrete) Roofer attached un-treated 2x4’s on top of old shingles then installed the metal roofing sheets. Should he have used treated 2x4’s? Appreciate your answer!✌️
Major Payne I’m in Florida, so we deal with different environmental stresses here than your dad would deal with, such as ice dam damage. Also, not sure how much condensate would come into play up there. Personally, I would use pt wood just in case. However, if the roof panels and fasteners do their job, assuming they are installed properly, hopefully dad will not have to deal with water/moisture come in contact with his non pt wood. If pt or not, once water makes it to that wood then the roof’s ability to properly shed water has been compromised. Hopefully he will never have to worry about water making it past his panels or fasteners and coming into contact with that wood. If possible, have the roofers use a larger ZAC fastener. I like the wider head. It spreads the load better and there is a larger neoprene washer, offering a bit more surface for any water to work past.
Two things please. 1. do you mean the existing shingles be removed and then put a metal roofing. 2. Is it possible to explain with slides or pictures for more clarity for people like me with no knowledge please
Yes, we recommended removing the existing shingles before putting on a new metal roof so you can properly inspect and deal with the decking material underneath. Here is a video about how to install metal over shingles if you decide to leave them on: th-cam.com/video/sjDNBgTdeBo/w-d-xo.html And here is a video on how to repair roof decking if you decide to take them off: th-cam.com/video/X_mPiNLYsvQ/w-d-xo.html -Thad
@@TheMetalRoofingChannel Thank you for the detailed videos. One more thing can you give a price comparison of Asphalt shingles vs metal roofing rather reroofing, I would say.
I have so many questions about metal roofing and also changing the style of our roof itself... I have been trying to find someone who is really legit.. ( more of someone who is interested in doing a collaboration and sharing with people that having a it done and done right is worth it). I am in Huntsville Alabama- no desire to DIY I just think it would be better to have metal roof put on because our roof looks like it really needs to be repaired.
Shingles last 15 to 25 years for the same price. Steel will last 50 years and can be painted for a fresh look at any time . barns built in 1890 and look they still have a steel roof . rusted but standing .
I've done many go for it work on good ventilation you can actually flatten a roof better shimming the purlins lay felt if not using purlins over three and one works good place screws at the highs in the shingles if not using purlins spray paint your plywood seams use a cheat stick to mark your panels 4 screw placement and marking any other obstacles I used to pre-drill waste of time anymore I just marked locations now with my cheat stick to get started snap a line on your drip start with second panel and by the way never use resin paper not not sure what that guys education is but it ain't roofin If you do go directly over shingles with no Perkins. It will be little bumpy clean well run felt no plastic cap u will see them through metal could run vertical while doing your sheets
No petroleum left in shingles. The shingles of 60 years ago are nothing compared to the recycled cereal box shangles that you can purchase today. Sun dries them up and they chip away when the plastic tar dries from the seal line. They end up in the neighbors yard after a windstorm. Plus many other cardboard box shangle issues. Metal roof here it is wood deck on residential roof with appropriate underlayment then metal roof. No wood perlin unless it's a pole barn. Never EVER should you apply steel over 20 grit sand paper aka shingles. It will Rust from inside out due to thermal expansion. Back and forth movement over time. Apply metal roofing to a solid wood substrate any time you can in residential projects. I recommend a True standing seam metal roof with 24gauge Akzo Nobel,PPG, Or Kynar hylar paint systems. 40 year warranty on some of these paint systems.
1st guy. The question is: can you? Answer: Yes. So should you?? Thanks 2nd dude. I get the feeling these roofers are not liking to do a metal roof OVER shingles. I have shingles now in Florida, my neighbor just put metal over really good shingles cause that is what she wanted....my roof is good too, doesn't leak and why should I tear off all the asphalt, start over with a bare roof...I don't believe these clowns.
As a building contractor of 30 years, NO NO !! , there is no benefit to putting metal over shingles, the minimum weight of a bundle of shingles is 110 lbs ,per 10 × 10 foot area, just tear the shingles off,, any roofing contractor that tells you to leave them, just don't want to take them off,,
how can you see through the shingle if you are getting the fasters to hold mabe wood is half rotten no way in hell where can you find the studs mabe they arent perfectly on center and mabe they are off and the faster is just barely in rafter take the shingles off and do it right plus you are putting more weight on already a existing roof dot skimp on your roof its the single most important part of your home if it come off then you got to do it all over again extra expense
I've personally seen a metal roof installed directly on the shingles, had been there 35 years. The bottom looked like the day they laid it down. Architectural shingles underneath as well. That roof is now 50 us years old and still brown. The color held up very well considering the age. Was likely a simple latex polyester
I agree also. Big companies have sales quotas to meet and want to sell you the whole package to make more money. I seen a 30 plus year roof over shingles and still in good shape
i screw the metal roof right into the shingles?
@@YOUARESOFT. I would add a vapor barrier (synthetic udl) it's cheap and keeps the paint warranty valid through the manufacturer. I was just stating what I've personally seen and been in the family metal business 30 plus years
On existing shingles..
If no leaks..
1/2 lap felt .
1/4" fan fold foam.
2" screws and metal of choice..
I have several 30+ year metal roofs with no leaks and no problems , they are exposed fastener roofs.
After the first year , a fastener inspection is always mandatory for my roofs . Just the odds that a few will land on a decking seam and work loose .
Sales men are clueless to what is going on ( most of em).
so if you hit a seam and the screw is loose do you put in a larger diameter screw to seal the hole up?
@@charleswittmer2477 yes , I also pulled screw out and put solar seal caulk in the hole and on the screw let it set up a little and snug it up.
What if you have existing small leaks? Same recommendation or? Thanks
@@cajun869 I would at a minimum look at decking from attic and decide if decking is ok- not rotten , if not ,,, I don't see a problem with doing it.
Great points in this video but I have done over 100 of them with no issues an I do a thorough inspection of the roof beforehand
Hi Keith! My existing tar shingle roof on my garage is from 1977 and I want to do a standing seam metal roof over top of it. If the plywood decking is in good shape, am I ok to do this? Or based on it's age, should I be replacing all the decking?
Don't listen to them. They are high. Put down some felt paper right over your shingles. Trim all the overhang off the shingles.( I popped a chalk line and cut the overhang with a skill saw on shallow setting.) Let metal roof overhang about 2 inches. Go to town installing your metal roof. Oh yeah, be sure to use 2 inch screws. And do a watertight job with the flashing. The metal roof plus the shingles underneath add some additional insulation value to your house. Mine is 10 years with no leaks. Did it myself. FYI . I had bad leaks before I installed the metal roof.
You can do it with strips of wood but the name of this video, Is can it be done? Yes, it can be done.
P.S. I hate people that talk in circles and confuse the listener. Most people are looking for a simple Direct answers and to stay on topic. ( it ain't rocket science )
I’m actually thinking about doing the opposite. I have a metal roof that’s leaking. I want to put shingles over it. Can it be done. I’m going to do it myself. I live in a trailer home.
You basically put a bandaid over it and didn’t resolve the issue. If there was a leak then there is wood damage that wasn’t fixed and now when you go to replace the metal roof it will be 2-3x as expensive since there will be 2 layers to remove and even more wood to replace now. But hey, who wants to think long term just slap a barn roof over it. Because that’s what metal roofs are for- barns.
@@cohco9320 It is called a Roof Over, poles 4x6 or 5x5 alongside the trailer 2 x12 career and a rafters decking and shingles over the trailer , You can not add anything over a metal roof on a trailer . It will not hold a load . By chance if you have a plywood deck you could remove the metal and use shingles on the trailer if it is not 20 years old or older. I seen Trailers that come from Florida to Missouri only had 2x2 rafters 2x4 walls . shingles 10x10 sq foot 220 pounds, metal 10x10 foot sq 60 pounds .
@@cohco9320 much easier to build a 2x4 frame and screw the r-panel to the frame that is setting on top of the trailer. Be sure to tie it down though or it will be like a kite in the wind.
This was done more by lawyers than roofers.
First, I would offer my opinion that it is always better to strip a roof before any reroof, for all the reasons stated, but especially for the ability to do a proper inspection. However I personally feel that the issues raised are generally overstated. I have never hesitated to do standing seam over one layer of resonably flat asphault shingles. You are only adding perhaps 1/3 the weight of a asphault roof so load is not an issue in most cases, and will in most cases be less if you are in snow country because the load will be released when the snow slides.I don't quite agree with the emphasis you have placed on moisture issues. The small amounts of moisture that may accumulate under a metal roof(residential anyway) will easily dissipate quickly under normal conditions. The problems arise when exccess moisture is being created in the living space and not being dealt with properly.Common issues in the northeast where I live? Wet cellars is a very common one, propably the worst in residential. Drying firewood in the house.Hot tubs.Large families(lots of showers, baths, etc.).And of course a leaking roof , due to improper installation or age. All these things get a lot worse in the winter when that excess water can become frost and accumulate to pretty significant quantities.Often you can't get rid of that kind of moisture with a vented ridge cap or gable end vents.My point is if you eliminate the cause of the excess moisture that solves the issue more easily that trying to mitigate it .In other words, fix youe cellar, vent baths propery, etc. .
I always use a slipsheet no matter what I go over. But again I think you might be overstating the issue of laying the metal panels directly over shingles. The given reason is the expasion and contracton causes abrasion to the contact service. But really, you make it not like there's theres someone under there with a belt sander! I have removed many metal roofs that were installed directly over asphault and never have encountered evidence of this issue. What is the coefficient of expansion on a 25 foot panel, maybe 1/16 of an inch spread over 25 feet. It would take a thousand years to wear through.But I personally love the new synthetic barriers; they're cheap and I always use them.
Having said all this I do not really disagree with any that you have said.Yours is the safest plan of action.I recently did a reroof that had rolled roofing/wood shakes/asphault(yes, asphaut over wood shakes)/asphault/ and the customer actually wanted to go over all that with standing seam to save what I knew was going to to an expensive strip.I simply refused and they took my advice, but that sure shows how extreme things can get sometimes. But often you can look at a job , say this is not going to be an issue in this particular situation and you can save the customer some money. Anyway , thanks for the informative video.
Thanks for sharing wow. So you would say it's OK with metal over shingle given that it's fairly even and free of bulging spots? Also you mentioned about synthetic barrier which brand? And I saw lot of people do 1x4 wood trip framing over existing shingles and attach metal roof on that wood grid they created. Is that not recommended?
@@JJ-pf7qo It's hard to give you aspecific answer, but I install double lock standing seam which is in a category of it's own . If you are thinking snap-lock or screw-down (exposed screw fastener) then strapping the roof may be a requirement for going over old shingles. It would be a requirement for a screw down roof as the screws will leak if they don't go into a hard surface. Snap-lock may be a case where the manufacture may also require purlins installed over shingles to honor warranty for their own reasons. If you have substrate issues(water damage,etc.) you really should strip it. So I never meant to say go over every shingled roof. just that there is no reason in my opinion not to go over them just because they are there. If I go over them with my standing seam thay have to be in pretty good shape. With strapping you've got a lot more flexability . As far as membrane every lumber yard or metal supplier has a selection and basically all are sutible these days for metal underlayment. I use Rhino roof a lot, and also the more expensive Roof top guard. Also keep in mind that if you go over shingles you can't install a water and ice shield barrier menbrane if your in ice dam country like I am. With double locked standing seam I seal the seams top to bottom with caulk but this would not be possible with screw down or most snap locks as far as I know.
been there done that....1937 house...tore off one layer of asphalt shingles to find another one underneath, tore that one off to find the original roof material of cedar shingles.....doubled strapped (1x4s) over cedar shingles...first layer vertical, checking/adjusting for plane, second layer horizontal, creating a good airspace. Next was tar paper laid vertical with half overlap (uses more paper but makes handling the panels with no possible damage to paper way easier) I installed this 6/12 pitch roof singlehanded! The panels were 3 feet wide "M-form" predrilled on the ground to a 18 inch diamond pattern. That was 16 years ago and I couldn't be happier with the roof.
Thanks for sharing, Francois! -Thad
What if you put a sandwhich of black tar/felt paper between the exsisting shingles and new metal roof? Thanks in advance?
Just put the 1x4s
My shingles roof is set on metal 2X3 steel. the shingles were recently painted with Lanco Siliconizer to seal the shingles, which are about 8-10 years old. roof looks fine, a couple of spots have been replaced due to plywood rot, but 99% is fine. Considering the shingles have been painted over with silicone-based paint, can I place pre-painted, ENAMELED (both sides) Steel roof directly on the shingles ?
I painted my roof with pintura siliconada, can I put directly over there the metal roof???
When you use one by four strapping over the shingles nailed directly into each rafter, it creates a completely new deck and every screw is installed into a fresh piece of new wood. That is the only way to go. If you screw metal directly through shingles, you have no idea what you’re screwing into underneath the shingles. Strapping eliminates that issue
Changing a metal slate shingle roof for standing seam. Thanks to you guys i was able to ask relevant questions. Thank you
YES its done all the time!!!!!
Also the bottom of the roof deck gets scratched exposing bare metal on the bottom creating a spot to rust quicker, air gaps are also a common part of the insulating properties. Also furring allows a space for insulation to be added.
What rust are you talking about the reason you putting metal is so that no leaks
Yes yes yes. Best to insulate also. U are correct sir
Can metal roof be fastened to 2x4 only or do i need plywood . Im covering an open porch .
Question regarding roof vents on an existing shingled detached unheated garage. Decking in perfect condition, 12 years old. Wanting to strap 1x4 and roof over but roof has 2 roof vents on each side of the roof at the ridge Simple gable ended roof). Can I simply roof over them or do they sell metal style roof vents for rib roofing? Thank you. Location Ontario Canada.
The right way to do it is the same as how solar panels are applied, using a few inches of air space. This is what the advantage is. So just have large metal panels vs the small solar panels, and this basically shades your roof. Its not rocket science, just practical fact of sun vs shade and reflectivity vs conducting and radiating heat. Just make sure you make the air gap large enough to make clearing leaf build up easy. What you will also consider doing is deadening the metal from underneith. This will help make it quiet when it rains and with wind. This gives me an idea!!!
carport has shingles that blow off and want a metal roof and guy wants to put 1x6's up and attach metal roof to 1x6's .It is only one shingle roof on it .I live in southside VA ,up on a hill and it is always windy here
For those of you who don't want to listen to inane chatter, THE ANSWER IS YES.
Like the man said - it's not can you but should you.
Thanks I didn't even watch the video because of your spoiler alert.
@@c.j.wesson7843 10 minutes of your life that you can spend anywhere you want! You're welcome.
Thanks for your comment, you saved me from having to listen to babbling
Of course they’re going to advise against. Woodwork is their bread and butter. More labor equals more 🤑
Need to strip the entire roof, (several trips to the landfill (30 miles away)), ice shield entire roof ( very expensive), 1" strapping at recommended spacing and valley flashing. Then all the pricey metal gable and eave moldings, etc. and then the metal roofing of course. My roof deck is mint so I think I'll chance the "over the shingles" method.
Agreed! Can you also spot the vague/ barely knowledgeable sales man lingo.
Very true installed metal roofs in Austin. Installed every roof stripping all the shingles and phelp then put the ice shield. I believe if your having a leak or something that’s is already weak just adding weight to the problem
There is a downside to tear offs. Mostly with smaller crews,they might tear off Thursday n Friday. Rooftop delivery comes Monday with fell paper , weather shield,drip edge. If it rained over weekend the truck is still coming. Hey guys the roof is dry enough, get to work. Hey boss how is the plywood ever going to dry? When it rots we get another job out of it. I would imagine this could happen when your metal roof guys show up.
Can you put the metal sheets right on the OSB with out strapping? I'll be putting Dupont synthetic underlayment down first then the metal.
Yes you can just paper it first.
Of course you can. It’s standard practice. We’ve done hundreds of them. Some over 25 years ago, no problems.
as long as it dont leak and doesnt fly off ..DO IT !
I bought a old farm house with standing seem over shingle over wood shingle. House caught on fire. Fire department showed up and had to strip most of the steel off before attacking the fire. Normally they would simple knock a hole in the roof to allow the flames to go up instead of climb the roof inside. But because the medal was over all that it just made it hard to attack. Once the medal was off and the roof was opened up then they could drop water in from the top down. But by that time the damage was done. In that region if it was a normal standing seem it would be medal over wood slats. Again if it had a house fire it would be easier to punch holes and vent the fire because there wouldn't have been near as much fuel sitting directly under the metal.
Rod they could have axed a hole in the steel the same as a wood roof . was it a Rule Fire Department or a City fire department , Volunteer firefighters ? Volunteer and Rule are not as well trained as City . I live in Rule and if I have a Fire my house would be gone by the time they get to the fire . 45 minutes and they have to haul water from the creek 15 minutes away for the pump trucks . was not about the steel roof it was the lack of knowledge firefighting . ;)
and with insurance, you got a new home FREE!!
@@lostintime8651 good luck with ins for rural home without water supply. A above ground pool is a water supply.
@@JCcanU rural not rule
@@John-ze3vo Thanks I still spell words that have the same meaning wrong where and were rule and rural . One of my draw backs ADD in School in the 60s 70s .
if a roof could be layed over with metal. it would be less waste than tear off and re roof.
As with everything else on the internet, no simple yes or no is found. Simply put, yes, you can put a tin roof over shingles. I recently purchased enough tin to roof my log cabin in the mountains of NC and the company I purchased my tin from told me about the liner I needed. It is basically Tyvek. It gives you a heat barrier.
Thanks…kept them from wasting time. Tyvek roof done
You didn't buy tin, you bought steel.
@@sugardippedtitz No, I purchased tin roofing, which is pressed steel.
What is your recommended to put a metal roof over a shingle roof 40 years it's house?
Because I want to change of this year please let me know soon ASAP
We recommend removing the old shingles before installing the new metal roof. It allows you to fix any decking issues, address ventilation problems, apply a new dry-in, and minimize the potential for oil canning. -Thad
Ok great,
thank you so much
Thanks. This helped me make a decision to just do a tear down. We have 1000% humidity, monsoon, blast furnace summers here.
We have a cabin that is used only in the summer. It is uninsulated. Inside the cabin we look up and see the decking and framing/joists etc. CAN WE INSTALL THE METAL ROOF RIGHT OVER THE SHINGLES? OR DO WE NEED TO USE 1X4's (FIRRING / STRAPPING)?????? Please settle this argument we are having within the family. This is a fly in cabin, and we can not get a contractor out there, so we will be doing it all by ourselves this summer. We need guidance! Thanks.
so you are gonna fly the metal panels in?
how do you do the exhaust vents that come out of the roof for bathrooms and also chimneys
Install roof panel from the peak to just below the opening, install the remaining panel below with a u shaped cutout keeping in mind to go underneath the top panel at least 6". Install vent and the vent flashing.
I'm putting in vented ridge cap and deleting the roof vents. Also running flex vents up to the ridge cap. Don't know if it's "right" but most modern construction uses vented ridge roofing.
One of the best things about a metal roof is the thermal properties. Metal cools down much quicker in the evening, keeping the house cooler in the summer. Asphalt has a lot more mass and holds heat longer. Covering asphalt with metal roofing defeats this significant benefit of a metal roof. This is enough reason for me to remove the old roofing.
the answer is yes, but make sure you have ventilation, such as 2X4 strapping and the barrier, such as the radiant barrier, on top of the existing decking, in this scenario the shingles. I am gonna do it.
We live in Atlantic Canada. Damp and wet and boat loads of snow. Our camp has had Metal. Right on the shingles for Decades. We left the ends open and the cap has room for air flow. We also have solar panels on the roof and a wind mill. It's been great for 20 years. We haven't had any of the issues these people are talking about. The roof is light grey to reflect the heat. We also have a solar heater box that we use a sheet of the same color. To cover in summer. A light grey roof will reflect the heat.
I have a hip roof and my attic heat is like 200 degrees. On this old house show, I saw foam instillation on a metal roof.
Yes ... no problems !
I put my own own. No problem for 20years check screws sometimes
my house was built in 2004 and only has 1 shingle roof but lots of exhaust vents for 4 bathrooms and 1 for the heat pump and a metal chimney and the big round roof vents that are for the attic .I see here the seem to cut the bathroom exhaust vents and to me that traps moisture between the shingles and the metal .I don't want that .I live in southside va 15 minutes from the nc border .My house is 2x6 studs with 4 feet of blown in insulation in the attic .I want to have shingles torn off and the waterproof membrane put on
All metal roofing panels are installed on strips of wood that is screwed down to rafters and decking. The answer is YES you can and like 20 houses in my subdivision did it over existing roofs. And NO you don't need any underlayment because you still have your old roof that will be doing the exact same thing and more. (LOL) Condensation? Nope again; the wood strips allows air to flow under the metal panels. Hot air rises! They are intentionally trying to confuse the audience by going off on tangents about bullshit. 10 - 1 says they all work in sales positions and have never installed a metal roof in their lives.. (ehhe)
if i wanted to extend the roof to add an over hang on a gable roof could this be done by using the 2x4 strips that are nailed down for the metal roofing. I assume there it would work just not sure if it would be frowned upon or if Im missing anything.
What about metal shingle roofing? I don't think they have any wood strips underneath them... Would it still be fine to install metal shingles right over them?
yep they know what they have read. they don't know what they don't know as the old man told me 50 years ago.
Just had Hy Grade Roofing install a metal roof at my house. Worst decision I could have made. They promised to install the roof in 4-6 weeks, of course they were late. When they finally showed up without the proper equipment and damaged my property. They are really proud of the “Quality Audit” that they do, but of course they won’t give you a copy of the audit…lol BTW -the “Quality Audit” they did at my house consisted of 2 guys coming over to pickup the leftover junk they left at my house for a month. They never even went up on the roof! Save your money use someone else!
Good info.
Novice roofer here. I didn't know...what I didn't know.
The cooling and retaining heat issue, I think, is a big one for me.
Answers my question. NOT the best Idea.👍
Thats what im thinking too. Really save a ton of time and work to not strip it but the heat retention issue is hard to ignore
Put your metal roof on. Just don't seal up the caps. It will breath just fine and last well before you are dust. Only metal roofs the "blow off" have wood planks underneath. Never seen direct to one layer roof have problem unless incompetently installed.
What if you don't have any decking
Is the $400.00 - $600.00 per ton metal roofing through Alibaba true?
U can , ventilation is the key .
If using galvalume metal you can go directly over shingles does not heat up and hold heat No air gap needed
Yes
Yes you can put metal over shingles. Make sure you have a 3 tab roof. If the shingles are curled simply cut the tabs off. Nail synthetic felt over the shingles for a vapor barrier.
That's ridiculous you remove the entire asphalt shingles and start from scratch way cheaper and wayyy more structurally sound
@Sam Radowick "simply cut the tabs off" it is no longer waterproof.
Can one install tin without a roof? 🤔
Yeah because I'm checking for code or getting permits. Out in the country. I don't even know what that is
I would strip the shingles just to lower the total roof load. Besides with the shingles gone you can inspect the underlayment.
This would be the way it should be done, but sometimes the cost of repairing what existing damage is revealed after removing the shingles, may lead to replacing a full roof. I know it's best to do it right, but, for me who totaly is living on Survivor Benefits, I'm shortcutting , by placing tin roof over all of it. Please don't take my advice. As later, I'm sure it have to be do e right. Like, repairing first. I'm in a great need of a roof repair, but, with my income, I would never be able to afford it. A tin roof, is in my wish list.
Why get rid of another layer of protection from water intrusion?
I have a 100 yr. old house,, before I bought it someone installed a metal roof but were smart about it,, they removed all of the old roofing right down to the rafters, installed new Decking, and then installed the Metal roof-- I’m extremely thankful they took the extra and more expensive steps because I would NOT want 2 or 3 old shingle roof’s doing who knows what underneath a brand new Metal one....
what about 1 vertical board layer screwed to the stuctural wood, then some 1x4s horizontally over the top of that? assuming the screws are flexible and not brittle, of course, like #12 5" stainless screws.
I put 1/4 folded insulation over the shingles then metal. No problems after 30 years.
What significant issues are present if shingles are architectural shingles?
With the architect shingles you would have to put the furring strips or just tear off the existing roof.
@@davebrakefield161 I did mine and everything is fine, I only tear off the caps
Insane! They blow a lot of crap but don’t tell you what you really need to know which is you don’t apply it directly over the shingles!
One of my concerns would be the weight of metal installed over shingles, i know its common to have two layers of shingles which would be heavy. So how heavy is a metal roof compared to shingles? I currently have only one layer but would prefer to tear them off before installing metal especially considering how soggy the ground can stay for extended periods here, I have enough problems keeping the house leveled and out of China without adding even more poundage on top of it all
Actually a metal roof is lighter compared to a shingled roof. On avg metal roofs weight 1.4lbs per square foot compared to 2 to 5 pounds per square foot. I'm getting ready to install a metal roof over my old single layered shingled roof.
@@AlexMarkovRus Thanks! That's a considerable difference! I know it's relative to the gauge of metal used but definitely good to know!
@@BK-bh7wn It's still a lot of extra weight either way, especially in snowy regions i wouldnt want all that on my roof.
One thing they don't mention about a roof over is that if ur new roof leaks, u have ur original (no leak)? roof under it. I think many contractors want to reduce liability and charge more for a tear off first? Tear offs add a lot of costs but if ur rich, go for it. It usually boils down to ur budget.
Works both ways. What if you had a leak in your original roof and have possible deck board damage? Old roof gotta go.
@@BlackMan614 what are the chances of it leaking in the same place?
@@hardset-vi3ze What does that have to do w/ anything? If you have deck board damage w/ possible mold - it has to be removed. End of story.
@@BlackMan614 who said anything about deck board leaks? I didn't. If you know you have a bad board or weak area...fix it first, of course.
the carport was built in 2006 and is an A frame
furring strips-----how can you walk on your roof to clean gutters, branches ets ?????
buy a roof rake genuis!
Daveat191 26 ga roofing will hold 300 pounds at 2 foot centers I weight 200 and walk on my roof . I have built over 50 pole barns and roofed many homes with steel , homes 10 years old 15 # felt over the old roof no furring , older than 10 I use furring strips 1 x 2 every 2 foot . you can walk on it . roof over 20 strip it first and use underlayment . homes with 2 layers of shingles strip it .
Because the furring strips are supported 100% by the existing solid deck. You aren't removing the old decking so you are fine.
@@JCcanU How much do you find it can save you? The application + materials of the furring strip VS. strippping the roof and disposal. 1/3 the cost for that part?
@@vincentcummings5508 if the roof has 2 layers or more asphalt shingles you want to remove them , in Code area they do allow up to 3 layers , other code only 2 . Heavy snow belt . Landfill charge by the ton plus the labor to strip the roof if the roof is in good shape not buckled sunk between truss not all wavie I will apply right over the asphalt shingles . when its all wavie I use fur strip . 150.00 $ a ton 3 ton =450.00 and 4 guys 20 a hour 4-8 hours to strip 640 =1090 $ furring 1.50 ea x 140 = 210 $ saving 800 bucks, Not counting fuel and time going to the landfill . I have used a dump truck 400 bucks plus the 100 in fuel landfill is 100 miles one way . I try to keep my caust down unless it has to be done.
CODE SMODE PSSST
I am so confused as to what to do. I have had 4 different companies come out. Two told me that metal over shingles is no problem. The other two said it's best to strip the roof.
I have two layers of shingles. They are clearly worn out and curling. They are very brittle and easily snap. I luckily do not have leaks yet.
Two companies said the weight shouldn't affect anything and the old shingles mean nothing. The other two companies said that removing the shingles is best for air flow. Any moisture will cause rot under the new metal roof.
What are y'all's opinions?
We maintain that removing the old shingles is best practice because it gives you the ability to identify any problems and ensure that the substrate you're attaching your new metal roof to is the best it can be. The companies that suggested shingle removal are right in that if there's moisture trapped in the existing materials, it can cause rot and damage. If you want further clarification on this please let me know! -Thad
You can but the true its not gonna be ok maybe some people like it but to me its better to remove the shingles and we have to fix wherever we need to fixed so to me its not right to put a new roof and hold playwood it's bad
Everything we have watched on your video talks about proper installation. We are located in southern New Jersey in a high wind area. We definitely want a metal roof but where can we go to find a contractor that is truly qualified to install metal roofing. Those that we have found say they are qualified but how do we know for sure? Can you give us any guidance that will keep us out of trouble.
Hey, Carol, great question! Awesome job doing your due diligence before deciding on your contractor; it's the first step in any successful roof installation. Here are some ideas and things to think about during your search: A qualified contractor needs to have references, appropriate licenses/insurance, proof of experience, and positive reviews. Check out some of their previous work online or in person, make a phone call to a couple of their former customers, ask at the Better Business Bureau and your state-affiliated roofing association about them and their work. Here's a blog article you can check out about finding contractors: bit.ly/finding-best-metal-roofing-contractors
And here's a clip from a Q&A episode we did on the subject as well: th-cam.com/video/DrJiEO3UmDk/w-d-xo.html
Lastly, if you want some questions to ask a roofing contractor yourself about their qualifications and your project, download this free checklist of questions here: bit.ly/contractor-questions-checklist
I hope this helps, and please let me know if I can do anything else! Once you find someone, feel free to let me know how your experience went. I'd love to hear about it! Thanks for stopping by and dropping your question! -Thad
@@TheMetalRoofingChannel Thank you for all the help.
@@TheMetalRoofingChannel your blog is broken.... link failed
Give this a try:
How to find contractors blog - sheffieldmetals.com/learning-center/finding-best-metal-roofing-contractors/
-Thad
How about purlins....then apply titanium, gaskets, then metal??
Yes.no.yes.no.yes.no....wait what?????!!!
You can, but it's always better to take off the old material ,check for any problems and then install the new metal roof.
@Sam Radowick If you don't want tpo strip the roof or any contractor that sells a job without removing the shingles are just flat money grubbing greedy contractors that have nothing but thieir own pocketbook in mind and not the quality or lifetime of the roof
They use excuse of why charge the customer more and pretend to act like its the customers pocket book they are protecting but in the long run that saved money goes into the contractors pocket .
Ive sold hundreds of roofs metal shingle TPO hot mop torch and every kind of metal u-panel r-panel 5 vee standing seam with clips without clips 3 tab 20 yr 3 tab 25 tr architectual 30 yr 50 yr and lifetime and out of all those applications not 1 manufacturer will stand behind not 1 of their roofs installed over another roof . So find a legitimate contractor that will do the job right and compare apples to apples . sure you may get a cheaper metal roof price but are they using 24 guage flashing or 26 are they using lifetime screws or the cheap ones that back out after 10 15 yrs . are they installing your new roof over existing shingles etc. its the little things that matter . And finally check the codes where you live and check with your insurance.. Would hate to have to remove that roof and reinstall it because of a guy who claims to have been doing it his way for 20 yrs and never had a problem !! I can say this doing it the correct way and Ive never had a recall and offered 10 yr warranty to boot thats over and above local 3 yr warranty from competition and 5 yr on liable issues from court on workmanship ..
@Sam Radowick Nothing political here im just saying the cost of removing the old roof however minimal it could be compared to the overal cost of the job should not dictate the proper way to put a roof on . However if leaving the shingles on is the way a person wants to do it when putting the metal roof on i think that 1x4 latting or nailers should be fastened to rafters with a ring shank nail every 24 inches to attach the panels to . Thats my opinion that worked in my grsat state of Texas thanks for your input as well . But to tell the truth you said alot but never said anything . What i learned from you is that the 7th nail must be a waste which the 5 and 6 could be too if nailing to a good deck not plywood . And seriously ive never heard so much crying abour removing a roof on a roof job . Isnt that the whole reason your there because the roof is leaking or has failed . But by god removing it makes no sense . I call BS . The only roof i would think to leave would be a total retrofit over say a spray foam mess .. my opinion
@Sam Radowick lol. Overkill thats a term that is debatable . My grandfather had a saying and yes he was a wiseman . Never seems to be enough money or time to do the job right the first time . But isnt it funny how there is always enough time and money to go back and do it over .. overkill is not using upgraded screws instead of cheap two piece screws that back out after 15 years and leak . Overkill is not using 24 guage flashing on all metal roofs so that you dont have to warehouse 24 and 26 and hope the right ones get put on your 24 gu standing seam so a better way is to purchase all flats or coils 24 guage and you insure quality on all roofs and uts a extra selling point for a screw down 26 guage job bonus 24 on the flashing .. over kill is a term used by people that tend to shave corners instead of operating smart . Large ir small when you have been a roof project for 14 months and you go to get your final check and nothing is on your punch out list to collect that check u did something right and i promise my name will stay in good standing .
Yes you can, but it is not advisable on a wood shingle or shake roof considering the cost of the metal and how you want it to look when you're done. If you do then you must lay down 2x4 skip sheeting that would be nailed to the rafters with 16P ring-shank nails for a more sturdy sheeting. If you use 1x4 skip sheeting your steel may look warped, and or puckered because wood shingles or shakes do not lay flat. If your question is about laying it over Comp shingles, then all you would have to do is lay down 1x4 skip sheeting. The comp shingles should be sufficient to act as a moisture barrier.
Great video and great channel. Thank you!
What about copper coated metal roots
Hello, thanks for the comment! Did you mean, can you put a cooper clad metal roof over a shingle roof?
Better to roof over shingles. When I attach 1x4 I screw into rafter. I measure for location. Test with screw first I hit rafter 8/10 times. When I miss then reset till hit. Once that is done then attach roof to 1x4’s. The shingles add thermal mass and one more layer of water protection. Roofers that strip roof is looking to make more money. If roof is wood shingle I would then strip to allow for more even application.
Come do my roof 😁
You would think in 2021 instead of using the wood for decking that gets weak/starts deteriorating after 20 years they could come up with a lifetime osb type sheet that is reasonable in price. Think it is more a money maker, so you have to spend. A better waterproof synthetic roof decking would be much better. I been in same house for 21 years and about 15 years in, my decking was going bad in different spots, took around 15 sheets. Now 6 years later I can see a couple spots looking wavey. I want to do a metal roof on new house I am buying in a couple weeks(will be needing roof within 2-3 years), cost is complicated, so hopefully I can afford it.
You could used treated wood for your decking but it wouldn't be cheap.
Y would code say no?
I appreciate the fact that u guys spent your time to answer questions here on this topic,However when guy says one shouldn’t metal roof over shingles over shingles over shingles it kind of implies people are idiots and some are,I would hope there are few people(if any) that would put shingle over shingle over shingles the way he said that was very condescending!!!Fact is if those companies that do metal roofing didn’t charge an absolutely absurd amount of money to have this wonderful procedure done!!!I am not trying to be insulting,but let’s face it though there has been huge efforts made to bring this procedure to market those efforts(engineering,product development etc) has been paid for I’m guessing a thousand times over and again,and it sure seems by the outrageous amount roofing companies charge they’re trying to STILL hit the customers with every single pricing overage that is possible,while justifying this tactic by insulting other companies installation practices,workmanship etc(wether true or not)while at the same time glorifying their own as a means to jack consumers for their products!!!It seems this is the American way to do business anymore,and honestly it makes me sick knowing it,Everyone wants to maximize profits,and there is nothing wrong with that,but to take full advantage every single time is corrupt!!Ive always felt that when you offer a quality product and apply it with workmanship based in nothing but good old fashioned pride,knowledge and the fact that you appreciate those who are paying you money theyve(usually)worked hard to obtain,you gain a customer for life one who you don’t have to ask to refer your company but instead because you’ve given him a job well done for a price he’s not going to hear a month later when telling people about said job is twice if not more than he should’ve paid,that person will get your company work based off all those things I’ve mentioned!!!
god gave us brains to get through the bs but you gotta either study or pay someone to study it themselves.
The elephant in the room is what does the code require. If the code says do a tear-off then I'd do a tear-off. No one wants to be liable for damages caused by not following the code.
Great point! -Thad
I am in the business and I installed my metal roof over my shingles. I have a roof under my roof. As they explained, it is not a good idea in every situation. Many things must be taken into consideration and the install has to be done correctly. You can completely strip a shingle roof, buy high grade materials, then have it installed by lunk heads and mine over shingles will out last it. High grade materials + Installation Expertise = A metal roof that lasts and lasts!
Dirk Diggler -Thx. My dad (Pennsylvania) has an old 1930-40’s style asbestos shingle (look like concrete) Roofer attached un-treated 2x4’s on top of old shingles then installed the metal roofing sheets. Should he have used treated 2x4’s? Appreciate your answer!✌️
Major Payne I’m in Florida, so we deal with different environmental stresses here than your dad would deal with, such as ice dam damage. Also, not sure how much condensate would come into play up there. Personally, I would use pt wood just in case. However, if the roof panels and fasteners do their job, assuming they are installed properly, hopefully dad will not have to deal with water/moisture come in contact with his non pt wood. If pt or not, once water makes it to that wood then the roof’s ability to properly shed water has been compromised. Hopefully he will never have to worry about water making it past his panels or fasteners and coming into contact with that wood. If possible, have the roofers use a larger ZAC fastener. I like the wider head. It spreads the load better and there is a larger neoprene washer, offering a bit more surface for any water to work past.
Dirk Diggler -Thank ya very much Sir! Good advice✌️
They begin to answer the question at :46 second mark
Thanks! All the questions are time stamped in the description so you can jump ahead to any question. -Thad
This is like a government staff gathering to solve and respond a question!😅
Basically they are ssying to rebuild the dang roof before installing....no need with corrugated metal. They ate tking strictly standing seam
Two things please. 1. do you mean the existing shingles be removed and then put a metal roofing. 2. Is it possible to explain with slides or pictures for more clarity for people like me with no knowledge please
Yes, we recommended removing the existing shingles before putting on a new metal roof so you can properly inspect and deal with the decking material underneath. Here is a video about how to install metal over shingles if you decide to leave them on: th-cam.com/video/sjDNBgTdeBo/w-d-xo.html And here is a video on how to repair roof decking if you decide to take them off: th-cam.com/video/X_mPiNLYsvQ/w-d-xo.html -Thad
@@TheMetalRoofingChannel Thank you for the detailed videos. One more thing can you give a price comparison of Asphalt shingles vs metal roofing rather reroofing, I would say.
I have so many questions about metal roofing and also changing the style of our roof itself... I have been trying to find someone who is really legit.. ( more of someone who is interested in doing a collaboration and sharing with people that having a it done and done right is worth it).
I am in Huntsville Alabama- no desire to DIY I just think it would be better to have metal roof put on because our roof looks like it really needs to be repaired.
Shingles last 15 to 25 years for the same price. Steel will last 50 years and can be painted for a fresh look at any time . barns built in 1890 and look they still have a steel roof . rusted but standing .
you can do whatever you want in mississippi....
Especially in tunica
@@stevenrobbins5425 only the white people talk to their siblings down here that marry your sister stuff is with the people from West Virginia
@@stevenrobbins5425 You are an idiot. I'm so sorry I shouldn't t say that. Oh what the hell... You are a fucking idiot!
How is it complicated??? It's a simple question. And the answer is yes!!!
Codes gotta love em
What about over a shed? We were going to put metal directly over shingles
AZ is based on local building code.
Trapped air or non moving air is a better insulator then moving air . Period
Only in a vacuum. Yes, I am correct. Good day.
I've done many go for it work on good ventilation you can actually flatten a roof better shimming the purlins lay felt if not using purlins over three and one works good place screws at the highs in the shingles if not using purlins spray paint your plywood seams use a cheat stick to mark your panels 4 screw placement and marking any other obstacles I used to pre-drill waste of time anymore I just marked locations now with my cheat stick to get started snap a line on your drip start with second panel and by the way never use resin paper not not sure what that guys education is but it ain't roofin
If you do go directly over shingles with no Perkins. It will be little bumpy clean well run felt no plastic cap u will see them through metal could run vertical while doing your sheets
and then when you're done all that put a big fat period at the end of your nice really long sentence.
Go back to school and pay attention in English class. Your words make you should like some ignorant dipshit.
No petroleum left in shingles. The shingles of 60 years ago are nothing compared to the recycled cereal box shangles that you can purchase today. Sun dries them up and they chip away when the plastic tar dries from the seal line. They end up in the neighbors yard after a windstorm. Plus many other cardboard box shangle issues. Metal roof here it is wood deck on residential roof with appropriate underlayment then metal roof. No wood perlin unless it's a pole barn. Never EVER should you apply steel over 20 grit sand paper aka shingles. It will Rust from inside out due to thermal expansion. Back and forth movement over time. Apply metal roofing to a solid wood substrate any time you can in residential projects. I recommend a True standing seam metal roof with 24gauge Akzo Nobel,PPG, Or Kynar hylar paint systems. 40 year warranty on some of these paint systems.
1 layer Old shingles...
1/2 lap felt then 1/4 foam board.
2 inch screws and metal of choice will out live you !
Done!
Hmmm
Of course you can. You can put a shingle roof over a metal roof.
lol!~
y would u want to?
"The other thing is is...."
"is is"?
The gap will only turn into massive bee best!!!
Massive bee nest?
1st guy. The question is: can you? Answer: Yes. So should you?? Thanks 2nd dude. I get the feeling these roofers are not liking to do a metal roof OVER shingles. I have shingles now in Florida, my neighbor just put metal over really good shingles cause that is what she wanted....my roof is good too, doesn't leak and why should I tear off all the asphalt, start over with a bare roof...I don't believe these clowns.
As a building contractor of 30 years, NO NO !! , there is no benefit to putting metal over shingles, the minimum weight of a bundle of shingles is 110 lbs ,per 10 × 10 foot area, just tear the shingles off,, any roofing contractor that tells you to leave them, just don't want to take them off,,
Remove the shingles do it right the first time
Now steal roofers going down😑😛now the Steel roofers 🤫going down 🤫🤫🤫🤫🤫
how can you see through the shingle if you are getting the fasters to hold mabe wood is half rotten no way in hell where can you find the studs mabe they arent perfectly on center and mabe they are off and the faster is just barely in rafter take the shingles off and do it right plus you are putting more weight on already a existing roof dot skimp on your roof its the single most important part of your home if it come off then you got to do it all over again extra expense
B/
Try concrete shingles