Installing a Radiant Barrier in the Attic | Alternative Method to Insulate the Attic
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To insulate an attic the conventional way, you need to air seal it from the conditioned space, seal and insulate existing air ducts, and line the attic floor with blown-in insulation. All of this is to be done according to the U.S. Department of Energy's recommended R-Values for attic insulation in the region, which in Ohio is between R-49 and R-60. That method establishes the attic floor as thermal boundary of the building envelope.
The problem with this method is that the attic remains unconditioned, therefore temperatures change drastically as the seasons change. The attic is very cold when it is cold outside, and on hot summer days it can reach temperatures as high as 140 degrees! If you have uninsulated air ducts running through such a hostile environment, the air that you paid to heat and cool is loosing or gaining temperature as it passes through the attic and is released into the rest of your home.
An alternative way to insulate the attic, is to make the attic a part of the conditioned space in your home. That means making the attic as cool as possible during summertime and as warm as possible during wintertime.
To accomplish this, Dr. Energy Saver recommends the SuperAttic System. In this approach, a high R-Value, 4-inch thick, and foil lined rigid foam insulation board, called SilverGlo, is fastened to the underside of the roof, leaving the soffit and ridge vents unobstructed so that the roof can be vented.
The SilverGlo boards are then taped and sealed to prevent air leakage. This process establishes the underside of the roof as the thermal boundary of the house. The insulation will prevent heat conduction in or out of the attic. The radiant barrier on both sides of the SilverGlo will reflect heat back to the outside on hot days, and to the inside on cold days.
An attic insulated with the SuperAttic System has a temperature very similar to the temperature of the living areas of your home. You can use it for storage, and the air ducts in the attic are now running through a conditioned space which conserves temperature. As a result, your home will be much easier to cool and heat.
To learn more about the SuperAttic System or to schedule your free attic evaluation anywhere in the country, visit our website or give us a call!
Twenty five years ago I put Reflectix (rolls of bubble wrap with foil on each side) in my former condo trussed roof. You staple its strengthened edges to the lower inside edges of the roof joists. The rolls are about 28" by 25', therefore easy to transport into attic. They were inexpensive, and you can finish in half a day. It made it so you could stay up in the attic mid-summer indefinitely. Before, you couldn't last ten minutes. I did help the lower living space in summer and winter, especially since both bedrooms had cathedral ceilings. The soffit and ridge vent should stay clear.
Sorry was it asphalt shingles what about longevity of the shingles would.you say as usual better or not ? Thanks
Hows the plywood decking and moisture level up there now? Is it still in good condition?
Leave a 6" air gap on the bottom and top of each strip, stapling the Reflectix to the bottom edges of the 2x12s. This provide ample air flow, with soffit and ridge venting within inches of the ends. @@brad2548
@@brad2548You shouldn’t have any trouble with it. You’re still getting your venting behind the foil. It’s stapled to the trusses, so there’s a channel of air for venting.
@@brad2548 when installing radiant barrier or any insulation to the roof of a home there is critically important things you need to do correctly during installation in order to ensure zero negative impact to the longevity of any roofing materials.
1. Make sure the Soffit & Ridge Vents are free of debris and ventilation is not hindered by any means.
2. Ensure there is a direct or at least open airflow path from the soffit to the ridge vent at all times. Soffit = Intake & Ridge Vent = Exhaust.
Cost Effective Pro Tip: Install gable vents from the soffit up to the ridge vent on all thermal barrier installations done directly to the roof.
Radiant Barrier installations must have a 3-4" air gap between the radiant barrier surface and the bottom of the roof deck and must be done seamlessly using reflective foil tape. I recommend running gable vents with radiant barrier if you're a do it yourselfer but never done this kind of installation before. It's honestly not hard, and it's often easy for people to overthink it.
Essentially you're containing heat, not blocking it. Most people misunderstand this concept, containing roof heat without redirecting it is worse than having zero thermal protection on your roof at all.
When insulating your roof, Ensuring direct and proper airflow between the surface of any thermal/radiant barrier and the roof deck is crucial.
Hi great video and interesting idea. I think the advantage of this over closed or open cell directly against the roof deck is the ventilation cavity which prevents any roof rot which may occur between the deck and the spray foam. With XPS, EPS, GPS etc you're really only getting R4 to 5 an inch so at best that 4" panel is giving you R20 which is way below code in most places (usually R48 or higher). While the space is definitely more moderate than before it's probably not a bad idea to retain the existing insulation above the ceiling too. The video doesn't mention whether the space should be conditioned as well, i.e. cracking a supply or return into that space to manage humidity.
Some of those attics look huge. That this silver barrier looks $$$
WOW😲 This looks fantastic...an attic that looks neat and organized,ducts look clean...it looks beautiful.
If you can't afford 4" go with 1" foil covered on one side. I pay $8 for a 4 x 8 around here on the after market. Makes a huge difference and you loose less head room in a shallow attic. Stored items will no longer cook or freeze like before.
This system works well up to point there is zero air leakage from attics to roof.
In wintertime, If there is any seam that the moist, warm air can leak from conditioned attic to the roofing, it can condensate on rafters and sheathing faster and more severe than conventional system because in conventional system, if there is any leakage from ceiling to unconditioned attic, there are still enough room for moist air before condensation forms and with reasonable attic venting, you will be fine.
This system is like cathedral or flat roof that are more susceptible to condensation
Makes sense. My problem would be I couldn't find leaks in the roof very fast or locate them easily.
Dasdfjkl,
Yeah, that could be a problem, you killjoy.
Marvelous Wonderful the venting should prevent mold growth by drying the roof out, but if a big leaks run down those foam boards and soaks the top plate...?
Also represents some challenges to vent any future ducting, like bathroom fans or range hoods through the roof.
you'd have the same problem with a completely foam-filled ceiling too
I live in a story and a half, so our central air does not cool the upstairs. th-cam.com/users/postUgkxxsUnXhGsSJLim_XnMHyQK0u3XVaW-CGn I ordered two of these units because our upstairs is so long with tandem rooms. I just got these three days ago and hooked them up today. These are so much easier than trying to insert window air and needing a frame for them. The Black and Decker are made really nice (actually better quality than I had expected) , they were easy to install. I only had to cut a few inches off the end of window insertion. They are not as quiet as central air , but they cooled down the room really fast and I am very happy with them. The only downfall I would say , is they will require a little more space. Our rooms are quite large, so it was no problem. I would recommend these units to anyone.
good luck getting this in your attics, this must be for mansions not the smaller homes cuz you will have to cut these into super small pieces in order to get this system in most attics. i wanna see the cost of these sheets and labor to install vs the cost savings compared to more modern blown in systems
True, but I've been planning to install an entrance to that area through the ceiling of one of my closets.. There is no way I can get up there now.
is it true that radiant barriers decrease the life of your roof?
@@inquisitvem6723 No. But don't do anything to the outside of your roof. Don't seal with clear coat or paint with reflective, etc...
Assuming you are in a very hot climate, the savings will be huge.
yes, i live in houston, texas. it is hot and humid here for like 8-9 months out of the year!
I gotta move to the Greater Cleveland area to get this? Damn, there's always a catch.
I wonder if the insulation in this application needs to be fire proof to any particular standards?
I don;t know how valid my thoughts are with other effects of this system. I would be concerned the smaller air space below the shingles would make them hotter on the underside and not last as long. The radiant barrier not only reflects the heat back to the roof, but traps the shingles in between a hot UV input from the sun, and a closer, hot radiation of heat on their backside. So the expense of installing Silver Glow, and a shortened shingle life (very expensive) could make for a lot of excess money put out.
+Lee Brewer I was thinking the same thing.
Why don't they just show a temperature test in that rafter space, both with their product, and without.
cameriqueTV I'm sure it reduces it
You could look at it this way. If no foam board is installed to the rafters sure there is overall air flow. However there could be lots of stagnate areas that it’s not flowing as much as it should.
If the foam board is installed then each and every rafter void will have equal air flow. Just my thoughts.
I might have missed it. I don't think you mentioned what "conditioned space" means. The house is conditioned?
He means making your attic air conditioned, just a few degrees different than the rest of the house: 2:16
If you have a roof leak water from behind these, how will you see it?
I agree that the rafters need to be vented but pictured here is excessive. I have a shed style roof I just built and its only 8" deep and the insulation is 4" with a 4" gap to vent. My eaves are open and the building is wonderful all year. Zero issues. I am in a mild climate which means its rarely freezing in the winter BUT its nasty hot in the summer but its as if the house was under trees its so cool. A roof doesnt require massive gaps to vent as shown here. A few inches will do it.
I hear if your attic contains your duct work, if it gets extremely cold your ducks may quack ?
John Hales 😆
As long as you do not eat the ducts it is ok.
I only raise turkeys in my attic. No ducks. If your ducks are quacking...apply more duck tape to their beaks.
🤣🤣🤣🤣🤣🤣🤣🤣🤣
Punch yourself
What if you have a water leak somewhere on the roof? How would you know?
Looks like the makings of a grow room.
So how then would you detect a roof leak?
My question, is what if roof develops a leak? How would you know? I'm concerned leak could go on and on and ruin roof without you knowing about it. Now if roof leaks, we see it come through to top of ceiling of room below and so can fix it right away.
barb1283 You're spot on, with a leak. With this system, the homeowner would never know their shingles/roof is leaking, until the leak stained the walls in the house, if it ever would (depends where the water decided to run down).
But that isn't the installer's (of this foam board) problem. They don't have to look at the future problems, like leaks, like baking the shingles due to excessive heat build-up of the roof itself. All they look at, is the $$$ for the installation of the foam.
Dan Inms Yeah, so according to you it is better not insulate house at all JUST IN CASE when MAYBE some 10 years from now your roof will develop a leak you will be able to spot it. And until then, put POS fiberglass batts and spend a fortune trying to heat and cool you house??? Wow dude, you are a genius.
barb1283 if it did leak, it would hit the barrier, and run out of the soffit, outside of the home instead of through the ceiking above your new tv or newborn crib.
Barb, You're correct. Tool Guy, you're a Major Tool.
Any isolated roof need a vapour barrier, so how could you even detect a leak?
Great approach,, for the good old school built homes,,that I as a contactor always built,,, but the new half ass builder's are convincing people to use truss,, with no benefits at all where you don't need to span over 24 feet,,,a good honest contractor would tell you that first hand,,and that you won't have any storage space at all when he's done,,saving himself on labor and maternal...
wow a lot of complainers....well let me see if i can help. We had a new roof put on last year... Cool Roof tiles with this Radiant Barrier. We did research on how BAD insulation blown in can cause health concerns and I did not want any of that. Lets not even mention the fire risks. This was done in less than a week -with a whole roof replaced... and it looks AWESOME! Even in our Garage. Our Electric bill in the summer was pretty even -no spikes. And so far this COLD Winter, we are saving a little... not as much i admit. But inside temperature is much more comfortable at a lower level. Were also using a portable heater on an enclosed patio, so that would probably acct for the pricing... anyhow we are thankful to Kern Golden Roofing in Kern County for doing a great job. Only mishap i would say is ''keep tarps over anything in the garage''. The removers laid tarps but they then took them off, when it came time to put roof back on-well left a bit of a mess. Very happy with this option. Highly recommend.
And they checked the level of the current insulation, did not remove so i don't know why anyone would say there's no insulation over the ceiling. With the radiant ceiling you don't have to meet any requirement level, but i had them chk over the current to be sure there wasn't any needing patched. We still get mice in there sadly in winter...trying to find where they are getting in... through the garage we believe.
a sealed in heated mice excrement experiment. THATS gotta be good for health. ;-/
They only come on winter- but i definitely agree its not good~ they seem to stick to over my room area to drive me nuts- but then like right now they arent in there so i dont know if the dog got them when they come out. It really sounds bigger then a mouse or rat even. Again don't know how something would get in
This looks like the most expensive method you could use. If you're trying to REDUCE the heat in that space, I think you could use foam spray, aluminum foil, thin reflecting batts, etc. I'll bet that even spraying the underside of the roof with aluminum paint would help.Hmm, I think I'll do an experiment to check on that.
Expensive? You know how expensive spray foam is?
Lol it’s not paint it’s a vapour barrier …
This product would have to be installed in new construction format. To be retrofitted through most houses after the fact with attic access openings of 2'x4' or like our 16"x20" opening could not happen. Unless it was cut up beyond repair.
There's a misconception about the attic space and it's conditioning. Unless you add vents to blow hot or cold air into the attic, then that space is not "conditioned" by this method of insulation. I'd leave whatever insulation is on top or your ceiling in place even if I chose their method. Energy is wasted in a home in the summer by three ways, convection (hot air from outside gets in via doors, windows, leaks at electrical plugs on outer walls, etc...), conduction (hot air outside on walls or in the attic creates a driving force of heat transfer into the colder room inside, insulation just slows that heat transfer rate down), and radiation from the sun (black or darker objects like roofs absorb and let the radiation pass through while shiny objects like aluminum reflect it). This product addresses all the heat transfer problems really well but probably is way too expensive to have a good payout. Don't know what the R-value of the foamboard is. Also, some people mentioned roof venting and the answer is you leave it alone or add more if the soffitt to roof venting is inadequate.
Steve Henry I think they add a vent and a return
Good points, but dont you think that conduction and convection effects are (or can be) cancelled out or mitigated? Radiation is taken care of by the foil (and to some degree metal roof (light colours, especially). While it is true that it costs more to put the insulation in the slopes, it gives you added space and it is much easier to control and fix issues if there are leaks (air or water). One other way of insulating is using spray foam (hard), but it is expensive. Why isn't styrofoam not used as insulation? In my area, I only have the spray or fiber glass option.
Some 1 John i
Folks are looking at long range survival w/o gas or electric heating. Homes with R 100 Ceilings and R 50 walls.
This video doesn’t make sense to me in that are large penetrations via the existing soffits running along the eaves. These guys are saying spend $thousands on foam boards and labor installation to slow down the entry of outside hot or cold air into the attic. I suppose the foam boards stops convection transfer of heat or cold via the roof, but I would just make sure the attic has as much R value insulation as possible, like 38 on horizontal surfaces and at least 19 on knee walls and vertical surfaces. I also have a ridge vent fir the full length of the roof peak. These guys just don’t make sense to me.
I'm just going to make a box out of this and live in it.
ROB NATION wow cool stuff, never heard of it!
Lol !!!!
SIP panels rule for new construction.
You're hilarious
Basically you are suggesting to adopt the You Tube videos covering building shelters for feral cats to building insulated boxes for humans to live in....? Lol!
How is the use of this going to effect the wood trusses,Alex ventilation and plywood decking in the long run ? Does this create ice bridges from one bird block o the other ? Should each birdblock/truss tail ends be individually vented with the traditional ventilation holes in each bay ?
So if (when) you get a roof leak, where does the rain water go and how could you possibly trace the point of the leak with the roof totally sealed off?
I could see where this could be useful when designing new construction, but 1) it would be a nightmare with truss built homes and 2) the roof better be built to superior standards to ensure no leaks.
Why would this method be preferred over spraying foam between the rafters? Wouldn't it be cheaper that way and you would achieve the same thing?
The code allows spray foam directly applied to the roof sheathing in many states, however many people say that spray foam does not allow the sheathing to breathe and cool in the summer. They also say the excessive heat can cause damage to the sheathing and shorten the life of the asphault shingles. I am a retired contractor and I think the jury is still out on this one.
I'm with you Bourne, I think it is undetermined how it truly effects things. Contractor myself and I just figured this was going to extremely expensive.
SailingandSuch Yep, the jury is still out. And what was it you were saying that was going to be extremely expensive?
To install those thick foam panels in an attic. No telling what one of those things cost. Also, in my area we have 50/50 stick built and truss roof systems so they would only work on half the houses. I would think it would be major pain to get these around and have them fit tight and seal tightly in your typical attic vs the nice open display they have with no bracing in the way.
SailingandSuch In my attic, I was considering doubling up on that 2" Dow foam board and sealing it with expanding foam. It's gotta be cheaper than the stuff in this video.
I've been doing this for 15 years with duct board. I offer this when selling a new heating and cooling system.
Quest - can the duct board be painted? And to get a finished look can drywall be installed over it?
Dr. Energy Saver could you please put together a video on how to obtain an R80 roof? I have been reading about passive solar homes and that they should have an R80 roof but have not found how to achieve such a roof. Your help would be greatly appreciated!
Where can I buy these boards?
thank you for this video! Attic insulation seemed hectic and I let the professionals at Pure Eco Inc handle it
Like the idea of boxing the rafters from soffit to ridge vent convection would probably be faster as the roof heats up
Is there an advantage to this silver glow stuff over regular rigid foam board insulation panels? I have to imagine it would be cheaper to buy a bunch of the panels at home depot and do this myself. Thoughts?
how does this product work with high wind? such as hurricane force winds to help pockets of trapped attic space air in the inner joist/beam spaces not collect depressurizing, and subsequently re-pressurization from not ripping the roof off with the limited air flow moving through the eaves vents and the ridge vent via joist or whatever now created by the sealed space?
Soooooo when you coming to Florida, cuz every home here needs this!
Wouldn't the foam panels get a better seal if the panel edges were shiplap joints or the foam was installed in two staggered layers?
Yes
Any idea on cost per SF?
DrEnergySaver Cleveland. can i seal my attic like you did in this video with 3/4 inch foam board or 3/4 R-matte plus 3 R3.2 that is sold at home depot. if so, would i have to make a box in the raffters so that my attic fans and pull the heat out in the summer. i live in deep deep south texas were the days are 105 and the nights are in the mid 90. and winter time it doesnt get to cold, heck i went to the beech on christmas day. thank you -mike
Is this type of insulation not Normal in America in England most of not all builds I’ve been a part of have used this ?
They point at all the issues with sealing the attic floor, and sealing the attic roof instead is logical, but they then conflate this with their product, as if all the issues with sealing the attic floor (pipes, wiring, a/c ducts) are also a problem with the attic roof - which they are not.
It looks like a great product, and would be ideal for a new build or renovation, but to back-install this in many homes would be slow = expensive, compared to spraying, etc.
Hi how would this radiant insulation install work in Portugal Algarve . The Algarve is hot in summer with cold nights in winter. Humidity is average 65 -85 % I think ! With a tiled exterior roof air gap ( 25mm) insulation board air gap 25mm) then plasterboard for the inner finish . Q..
1: would this be an effective install with at most 50mm radiant insulation -board .
2: is there a concern of sweating in different conditions ?
Thank you .
How exactly would you get a huge chunk of that foam with the radiant barrier up through your attic doorway? Cut it up into many small pieces?
Id like to see them do this video in my 1200 square foot home attic.
I will love to see how you access those foam boards into the access hatch
How do you cover the hip roof section to keep ventilation up the rafters? Do you have to add spacer wood?
Love this idea I was looking at spray foam but this is a do it yourself project
Depending on building codes, you would not be able to remove the ceiling insulation to add this type of radiant barrier. Required in my climate, vapour barrier, insulation. No exceptions! Unless you had blown in foam insulation in the ceiling, of course. Those sheets of foam insulation at 4" thick are about R-20 (2" = R-10). A sheet of 2" 4' X 8' sheet Dow polystyrene foam board is around $40 dollars. Can't imagine what the cost of this product would be, but it wouldn't be cheap. The minimum R-value ceiling by code in my territory is R-50. Good idea, though, if you live in the southern states.
There in Ohio?
In Cleveland that attic could double as a place to cool off after the Browns lose !
OHHHHHHHHHH!!!
Door how do called door thing called like look to tim3sorderupper ladder echo in fade the sun cook the watering the looked to wasdiana reyes
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Sole Ornelas please stop
What about when you have a Bounus Room and want to sheetrock the Area and use it as a Living Space?
What if the ridge of the roof isn't vented. But you do have vents on either side of the house for the attic. Could you still do what you're showing us?
I have a standing seam galvanized steel roof, which has lasted 98 years already. It was not constructed to ventilate. It is virtually a sealed roof. The original insulation was under the attic floor--about two or three inches of wool between the attic floor joist with floor boards covering virtually the whole attic floor. Decades ago someone installed fiberglass batting between the rafters, but the distance between the rafters varies. That together with the increasing brittleness of the backing paper of that fiberglass batting has caused it to fall out in strips. Over the years people have tried to staple it back up, with marginal success. I have removed all of that batting between the rafters. I am closing the eves with inch thick styrofoam board. My plan is to hire someone to spray a couple of inches of closed-cell polyurethane foam on the underside of the roof--between the rafters directly on the roofing lathe and the bottom side of the standing seam roofing that is visible between the pieces of lathe. How many inches of closed cell urethane spray should I have applied? I am thinking about spraying open cell foam insulation over (on the underside of) the closed sell foam. What comments do you have about this approach to improving the insulation of my house roof.
A silver glow is what the salesman or saleswoman gets after they sell you this stuff. Lol
So if its reflecting all that heat back on out to the roof, what is the long term effect on the shingle? unless you have a metal roof, youre looking at increasing the deterioration rate. Maybe not significantly but it seems it would have some effect.
that is why you use the CORRECT shingle type!
So with this system you will be heating and cooling the attic as well as the living space. That would be less cost effective than the traditional method. No mention of the R value compared to the traditional insulation method.
The installation seems straightforward for regular stick built roofs. I'm not too sure how that would work for pre-manufactured trusses. I guess it could be done but it would have to be a lot more difficult.
Where can you buy Silverglo for DIY installation?
In addition. The weather is similar in SW Washington minus humidity during the winter/summers. Is it typically safe to close foundation events during winter without creating dry/brown rot. Wood rot conditions?
What about condensation in humid climates like Florida? Can this age your roof or adversely effect it if installed improperly?
Hi sweety
this 4 foam is great.
however, you wasted a huge potential space for more insulation between the rafters. you could have sealed this foam between each rafter...with air gap of course....
OR:
you could have put several different types of insulation between the rafters with an air gap and still put those four inches over that
2 things you don't mention. 1 is that my attic is not so perfect like your example. My joists on the side do not go smoothly to the ridge vents Cross joists would stop the flow of air, so something would have to be done to allow the venting to continue. Also my attic has a place that is not even accessible because it is so close to the roof. 2nd my gas furnace is in the attic , I suppose there is enough air to support combustion , TRUE?
Great video and I think this is the future of attic insulation
Thanks in advance
Dennis... After A year , no answer... Where are the salesmen now?
09/15/2018 , still no answer from these guys. I give up on them
Raping other people that don't know any better I would guess !
What efficiency is your furnace? If it is above 80% they should be able to duct an air intake to the exterior of your attic, along with the exhaust. They commonly do this with basement furnaces as well, although it is possible to have the room provide the air for proper combustion as well.
I wouldn’t be surprised if it still gets hot inside an attic insulated this way. How’s the heat inside supposed to get out?
Foam burns yeah. I hope your board has rockwool or fibreglass inside.
1. how will this material comply with R316.4 for foam plastics in attic spaces? 2. this assembly will only work if each rafter bay has its own eave vent and there is an upper vent connected to all rafter bays.
So how will you know if your roof is leaking and needs repairs. Also I was thinking the spray foam or paint but not good when you have to do replacing. My aunts house doesn't have any insulation and if you use her restroom in the summer you'll come out drenched in sweat. Why are all restrooms like that even with central air.
Yah, but there's not a soffit vent under every roof joist in my situation. How do the other ones get vented then?
I suspect this would only work with a continuous roof vent at the ridge of a gabled roof.
In the Netherlands and the rest of Europe the Roof panels are insulated so need to do it after the job is done .
That is so untrue. Many buildings in Europe do not have insulated roof panels. Only newer homes use that construction method.
What about the rafter spaces that don't have eave vents? Usually it's only 1 in 6 that are vented.
That's substandard and probably violates code.
Confused doesnt this system mean you are heating and cooling all this extra space meaning the HVAC system you have already installed is no longer sufficient? In Florida I would not want to be trying to cool all that space. I already shot spray foam in all those voids but I still have kept my conventional attic floor insulation.
Absolutely no discussion of cost vs benefit. This is simply and purely an ad.
As a construction worker i can tell you this is not gonna be cheap.
This type of insulations in australia usually cost around $40/sqm compare to $8/sqm of normal R3.0 ceiling insulation
And you are looking at 10times more in labour cost.
you can save up to 20% on your energy bills with radiant barrier film... this is without the foam board...
Who cares about cost, how does it FEEL? That's the number one most important reason to insulate things, otherwise nobody would bother heating and cooling at all.
Indeed but still an interesting concept. No glass fiber in the air... just makes me wanna smile.
Seems like the best installation of this type of insulation should go above the wood sheeting and under a metal style roof. I did this with just two inch Styrofoam and cut cooling heating costs drastically.
They do that, too, it’s preferred, but only feasable if you were already going to be replacing a roof.
Styrofoam? Did you paint it silver before installing?
What about pest, like bees or wasp? If they get in, they would be unnoticed
Thank goodness
How do we prepare the insulation of a metallic chimney before we put insulation everywhere ?
This rigid insulation looks like 4" thick, is that correct? What is the R-Value for this single layer?
will this not cause ice damming on the eves as there is no insulation between the eve vents? Is that not the purpose of the foam attic batts to allow insulation to get to the edge of the overhang?
Also a great place to run your GeoThermal pipes. Which will add to the space climate stabilization, and make the transfer underground that much more effective.
I understand the concept of sealing the attic like the a living space but do you have to install another air duct coming off your unit and if you did would that make you unit run harder?.
If a firework to start, how toxic is that material?
Once that catches fire, how fast does it melt and spread?
I just had this installed. The four inch foam blocking. Is there supposed to be fill gap foam between every piece square block? They installed it and I noticed that there wasn’t foam or caulking between each piece. I can feel some airflow and thought it was supposed to be air sealed? Also at the base where the roof meets the soffit. The foam blocking doesn’t sit flush. It sits outside and in front of the silver glow above it. I just spent 7500 and I haven’t noticed a difference. I actually had to turn my heat up. I’m worried that if the foam isn’t flush with the walls below. That any heat that comes up the wall will be lost. Is there a quality control guy I can have come out?
This method is known as ´a warm roof´ in the U.K. Used mostly in new build.
Can I use this in my garage up here in Canada’s north, the same way you have it in demonstration.
Instead of blocking, could you install the rigid foam, then put closed cell foam in there? Small amount of foam, less labor.
Sounds great, but the illustration is only for a flat portion of a roof. What about a more complex roof shape with corners, or "hips"? The rafters at the corner (the hip-jack rafters) nail into the main hip rafter before it reaches the top of the roof. If something is put over the top of those rafters, there is no way for the air to flow from the soffit to the ridge vent. Do you just forget about soffit ventilation for those portions of the roof? If so, wouldn't those portions of the roof be prone to overheating in the summer or ice-damming in the winter, as there is no air flow through those sections of the roof?
For a shop. I need to insulate the ceiling without a sheet rock cover. I was thinking fiberglass with foil.
its not actually conditioned space. it would be compared to double pane window. The space would allow for the air gap between hot and cold. would be nice to see the cost difference between the two rafters or joists.
Is it safe to say this product is not recommended for truss roof systems?
How do you tell if you have a roof leak?
Hoe can you ever detect a leak when you always have to use a vapour barrier?
But with that system, do you need to install vapor barrier on the ceiling? Thank you for answering.
Why?
How would you vent the roof in a post and beam house? No room for soffit vents, and it currently has gable end vents?
If the roof starts leaking, it is not possible to notice a leak damage behind these panels. I would use detachable foil layer instead. Kind of like a curtain with the curtain rings and rods on top and bottom so that it is movable for inspection. Also I would use forced ventilation for the attic in order to vent the heat out.
Compared to spray in it is much better. A small hole can be made for camera inspection
Where does the heat come from that's heating the attic? Its coming threw the ceiling that is under insulated.
@M Detlef between and over the ceiling beams,not the roof rafters.you stop the heat loss at the ceiling. The attic should be as cold as the outside.
It seems your just transferring the the insulation blanket from the floor of the attic to the rafters of the attic. If the maximum insulation factor is achieved by 4 inch thick foamboard, how does it compare in R-value to fiberglass pink crosslinked batting that's 36 inches deep on the attic floor. No HVAC or utilities are installed in attics in Canada, so there's no value there for us. You may gain a storage space, but the home's furnace or A/C/ system is still going to be providing the BTU's to heat or cool the extra space. If hot solar heat is entering through the roof deck and being reflected back through the roof deck by the insulation, how does this affect the performance and longevity of roofing shingles? What is the capital cost of such an installation and how does it compare to a traditional system?
If you have a TV antenna in the attic this will render it useless. The foil blocks the signal. Also, if you have a very tall roof it would require ladders to install it in the upper parts of the roof deck and a LOT of material would be needed. I guess you could build a second ceiling in the attic so as to not need to go all the way up to the existing roof deck.
What's a TV antenna..?
*Woodrow Williams* Blocking electromagnetic waves would be amazing, but unfortunately we are also turning the whole Attic into an (energeticaly) toxic "Reich-Accumulator", due to the combination of Aluminium foil and the synthetic material. If we can avoid the alu-foil and put fiberglass or similar material, then it would be a great idea. The biggest problem however is the alu foil.
But would help out if emp went off
@@DennisMathias It's like a record player or an 8 track tape player. Hell, I guess a normal cassette player falls into this category too (I feel old).
how much does it cost per sheet?
Don't know but I bet it's a shitload installed from these guys !!
I bet it's stupid pricy, and you would get much better performance out of 2 layers of board with overlapping seams. Those seams will transfer energy fairly efficiently no matter how well they are caulked.
Great, you're absolutely correct and would be easier overall.
Like two hundred per sheet at 4 inches thick.
if you have to ask....
How is this suppose to work with a truss roof attic??? Looks like spray foam would be the only way rather than your ridged foam installation
What if you only have gables and a attic fan? Will this still work?
But would you get condensation on the side exposed in the attic and can mice still barrel thru the new insulation?
You would not get condensation if you have the right venting.
Is this publication still good, this information is over 10 yrs old? Do you have a modern foam or is it still 4" thick, ? Where can I buy 4" thick foam boards?