In Alaska, metal roofs are expensive, but they are considered premium. A pro and con is that snow slides off them. This prevents heavy snow loads on your house, but also creates safety concerns. The other major pro is that asphalt tiles catch fire pretty easily from embers whereas metal does not. This is not a small feature for remote places. We have forest fires every year somewhere in the state.
Well, for whatever reason it's very cheap here. Sometimes even used as building cladding. Where I grew up basically every house used it, and plenty of farm sheds too.
In Oz it's closer to 100% metal roofs, and usually colorbond (which has a 30 year warranty, and more like 70 year+ lifespan) and bushfire resistant which matters for us! Honestly, Aussies don't understand why people would use shingles (tiles are fine too)
@@darrenmx I chose plain gal (silver) so it would reflect heat, with Colorbond guttering. A lot of people in Brisbane do the same. All the old steel roofs in the area were painted a standard red, but there's none left in my street now.
- yep, that is the Australian story too... Nowadays all rainwater installs tend to be flagged as "garden and grey water use only". I have been so many places that without the rainwater tank, we'd all be dead - add a particulate and carbon filter - the best water around (avoid roofs with lead flashing or lead paint - Most tin (galv/zinc) ) roofs in Aussie never get painted (historically lead paint isn't great for drinking water) - colorbond lasts - a lifetime (until it doesn't, hopefully it is truly nontoxic) we all get thinner materials as the years go on, reducing useful life, better to go as heavy as is available..
Earthquakes earthquakes & earthquakes. So glad here in Christchurch when the earthquakes struck to have a corrugated iron roof. All those people with concrete of old clay ties with problems. Concrete tiles can be seen a lot on post WW2 houses. The house next door, now gone, was a concrete house with concrete tiles - post WW2 material shortages.
It's bizarre, because I saw loads of concrete tile roofs at the time that had jumped ship, but ours remained completely intact - we had about 15 tiles jiggle down a few cm, but that was it. I thought the builders back in the 70s had done a bit of a $hit job only wiring every fourth tile down, but from what I saw on other places, that was actually extremely diligent
Concrete tile was still very common on new builds until about the mid 2000's, here in the top part of Shirley (technically Marshlands) probably 60% are concrete tile built in the mid 2000's. The roofs held up very well, not aware of any rebuilds, and didn't see any roofing work post quakes. Most of the 1950's state houses in different suburbs also seemed to do pretty well, but I remember seeing roof damage in some T3 areas, Linwood, Woolston, Aranui etc.
@@petercroft9895 You can't beat a well built house. We were living in a Rimu framed, brick clad, concrete tiled house during the Chch earthquakes. The house was built in the 60s and the original owner had the builders go the extra mile. Every pile was double wired to the floor beams. The bricks were hollow with rebar through them and every tile was wired on. The chimney was short and fat. Nothing moved or failed on that house.
We had those in Australia as well. You could always tell an Austerity built home as they used fewer beams, frames, etc for the roof. They always had characteristic dips along the peaks. Most if not all by now have been replaced. Concrete tiles were a thing in Australia from the 60's untill the late 70's when homes were still being made from double brick. I had a home with them and would never get another due to the dust in the roof space and the fragility and need to repoint. Premium builds got terracotta tiles that were much better durability wise and were a lot lighter. Most people went for steel.
With butol roofs we fixed the movement issue by gluing a silicon backed tape over all the joins on the plywood before laying that way the butol had a bit more freedom to move, this is from a roofer in nz
As an NZ homeowner I always go metal because I get up on my roof for maintenance work and metal is safe for walking on..No problem water blasting it either or painting it.
I have a few houses with a variety of roofing materials and have owned others and been responsible for larger residential apartment and commercial buildings over the years. They all have their pluses and minuses. The current houses are between forty and fifty years old. The iron roofs have required painting and attention to nails working up or tech screw isolators falling off, and the concrete ones repointing and the odd tile replacement- I haven't bothered to paint them as I consider it primarily cosmetic. I think both are good as long as they are done properly and with good quality products at the beginning, and then looked after. The good thing with concrete tiles is that they are immune to corrosion unlike iron roofs which I have seen corrode through from the back by the gutter and corrosion at the laps, as well as failure in the colour coating. The only metal roofing I would use if I was building would be the heavier gauge long run clipped (no penetrations) commercial stuff. It is thicker and very strong and doesn't buckle when you look at it like domestic iron sheet or tiles which are very thin these days. The penetrations caused by tech screws or nails in iron roofs have been the cause of most of my problems over the years as well as poor workmanship on flashings. Like everything there is no perfect system.
I enjoyed reading your comments. Steep roof of any kind will last longer. Nobody seems to talk about this. My house has 50 year asphalt shingle in a hot environment in California, but I have a steep roof and very well ventilated attic. The roof will last longer than that, longer than 50 years The early demise most asphalt shingle roof is in proper ventilation in the attic because of code violations when construction is done. Almost 100% of the time ventilation is not properly done. Cooks off the roof and the underlayment
i feel like you overlooked the location of your buildings. are your rusty builds close to the ocean? sea winds carry salt that f steel up. you use aluminum sheets and flashings. and if your around rotorua ways geothermal shit is a thing too. ahhh perfection is obtainable just expensive
I have a lot of experience with asphalt shingles in Canada where they are used almost exclusively. I think that you have to be out of your mind to use asphalt shingles in NZ. 1. Proper installation cannot be assumed, especially when many NZ roofs are irregular and the guys nailing the shingles are low on the construction trade ladder (always, everwhere) . And you can't see what they are doing. (a) Besides what do you know about what is a proper job? (b) Assuming that the roofer- boss is competent and honest. 2. I don't know what NZ UV will do to them, but I do know what wind will do. The shingles will lift off. Does NZ have heavy wind? How heavy? How often? See also point #1, above. 3. Shingle roofs need to be replaced periodically. They rarely last the estimated life. Roofing over them is OK, but will reduce the life of the new layer. (Will your roof (in NZ made of those thin sticks) take the added weight?) You can't put on a third layer; you need to strip the roof. More work, dumping fees, lots of expense. And you still will have only a temporary asphalt shingle roof. (4) Asphalt shingles is a new material in NZ How long did it take NZ to figure out the changes in construction code and materials that resulted in an epidemic of leaky houses and commercial buildings?
East coast of Oz and it is rare to see a new build done tiles. Colour Bond metal roofs need zero maintenance as a rule and are so quite you have to look outside to see if it is raining. Old corrugated iron rooves were noisy but using modern installation methods have fixed that problem.
Yeah it's really about the install, have to put rubber down between the metal and the joists or you get resonance issues. Also depends a bit on the guage and type.
I live in NZ I have had “tin” roofs and concrete tile both. These are the most common types here. Steel is far superior. Concrete tiles are fine until the grouting and tiles start cracking. After 18-20 years in my experience.
Hi, i feel i need to jump in here and correct some misinformation... for clarity, i supply and install in Auckland Concrete, Clay ( you didn't mention), and slate. For lifespans of the roofing products you've mentioned lets go by what manufacturers are prepared to guarantee their product for with metal roofing guaranteed for the least and, in many cases, a third of the lifespan. The maintenance on metal roofing far exceeds that of the others. Concrete tiles do not require repainting. This is cosmetic only - no idea why you mention pitting etc. Slate does not require ply sheeting - it is the same as Concrete and clay .. underlay and battens. The meterage rates you have mentioned are generally off. And to be honest if metal roofing is that per m2 i clearly need to get my drill out .......
I’m glad somebody came in here and defended slate and concrete. Done right, by design and also by installation, there should be no underlayment required. Go to Switzerland and check it out, buildings that are hundreds of years old with large slate format. In the USA where I am at, the premature demise of asphalt shingle is overheating because of improper and in adequate attic ventilation below. It is almost never done right. And the inspectors don’t check it out properly.
If you've been in a decent earthquake, you never forget the sound of heavy tiles rattling above you. Having experienced the Canterbury quakes, I will always prefer a single story weatherboard house, with longrun roofing. Everything needs to be able to flex and move without falling on the occupants.
In Vancouver BC some houses have cedar shingle roofs. I had my roof redone last year with asphalt shingles. I did look into alternatives, but none were readily. available. ( Material ,trades, codes,)
Cost & reliability would be my explanation for the popularity of long-run roofing. With most roofing work being subcontracted for a fixed price the installer is aiming to fit the roof ASAP so they can achieve turnover, it is generally easier to see if shortcuts have been taken with a long-run roof while other roof types can look alright but have hidden problems. Various long-run designs with penetration features can have problems also which is why gable end or standard hip valley designs cause the least problems. Color steel is competitively priced although when the roof contractor adds 40% to the material & labor rates to the main builder who adds their margin to the customer as well you can see why expensive materials quickly become uneconomic for most house buyers. The Christchurch earthquake has made a major difference in concrete tile sales, I remember that 20 years ago there was a significant % of houses were built with concrete tiles however it is rare to see them installed now.
it would take longer and probably cost as much to clad a roof in 18mm marine grade playwood as it would to do a metal roof, then the shingles go on after, timber is so much more expensive in nz than North america, same reason all house over there the walls are all cladded in chip board before the cladding and we just put up building paper and a few sheets of 7mm for bracing
We have metal roofs in PH made of galvanized iron/steel but they rust and develop holes or leaks easily, sometimes within 1 or 2 years. They don't look nice and grey like in NZ and they're usually covered with paint. Maybe that's the reason for the rusting?
I prefer a roof that lats a 100 years with proper maintenance like concrete tiles, had mine for 35 years no issues. Leaky homes has caused lots of issues for NZ consumers customers as no one in NZ ever assumes responsibility builders, manufacturers, certifying agencies i.e local councils or government watching from the side.
I can of a couple more reason's. Durability and low maintenance being number one. Our metal roof is over 50 years old. Had it resprayed and checked. Some of the old leadheads were replaced with tek screws. Also it was easy to remove the old gas fire. And it looks like new again. Other consideration is after the earthquakes. Houses with metal roofs had less weight up top and kept the frame together. Houses with tile tended to collapse or warped. Id say metal is superior in most cases. The only concern is high wind storms and we've had alot in our region. But it did survive but is still a concern for me. Other being heavy rain cause of the noise. We can barely talk in our house when it rains heavily. Which we never got with a tile or the flat roof home. Also the noise of light planes and helicopters. Seem to be even worse under a steel roof. If we had more noise insulation maybe it would be perfect.
I am in the Philippines where we built a new home four years ago and covered it with metal roofing. The metal roofing is .6 mm in thickness made of mild steel and factory painted. When you look at it today you’ll see that each and every panel is rusting at the joint of the next overlapping sheet. It’s only surface rust for now but soon I’m sure it will eat its way through. What do I do to control this rust?!
I've had two houses with galvanized iron roofs only needing replacement after 100 years. I've not got much faith that the current metal roofs will last that long
Slate roofs do not need a substrate such as ply; often mount on battens (as per the interlock tiles at 5m) into which they are nailed. Historically were in effect a lightly ventilating roof with no membrane layers or ply though planking was used for bigger structures such as churches and cathedrals. A better system is the French "crochet" (hook) mount which if using stainless steel not only is extremely durable but enables rapid repairs in rare event of damage and age-related deterioration (repairing 140 + year old slate roofs with delaminating tiles or battens rotted/wormed needing replacement) or modifications such as installing roof lights or dormers. The advantage the crochet fix has is prevents wind lift (and was introduced in the Western regions such as Brittany where wind exposure is very high) as hooks to base whereas nails fix at top. Very rapid tile fitment to battens with no fixings in effect; just tightly gripping metal clips. On remedial work not using nails and potentially damaging internal cladding etc from shocks from hammering can be important and stainless screws are not cost effective on price and labour compared to speed of the crochet method and ease of recycling. Personally advocated ,for extra strength on every roof that I built, to incorporate ply or planking for historic aesthetics sympathetic to the building and breather membranes but choice nonetheless remains use tantalized battens and stainless crochets and good Welsh slate for the best aesthetic and definitely good for at least 100 years; much more durable than anything else. Whereas the human eye likes minimalist aesthetics it lingers on fractals and curves. A slate clad roof built on a green timber pegged-oak traditional roof drying to add sumptuous curves is my favourite; strong, durable, aesthetics to die for.
I don't like how NZ houses are being built now. They aren't! I have only seen town houses go up. Where we used to build 1 house on a section, now, there are 5 to 10 houses. It looks ugly. It looks 3rd world. We need to expand by creating new suburbs.
New Zealand also thought non-thermally broken aluminium joinery was a great idea too. Double glazing means nothing if it's wrapped up in a big heat sink. Thankfully this has changed, but I've love to see a return to timber joinery. The Europeans still swear by timber, aluminium is their least preferred option and PVC is their standard offering. They know winter as much as anyone while the average kiwi is often found in substandard housing with a winter power bill that could make Bill Gates cry.
I mean metal roofs are the best roofs or at least one of the best roots of all time that you can get. So I don't blame them for getting metal roofs and they're so much more options nowadays than what there used to be.
A dark anything roof creates a very hot roof space. But concrete tiles hold that heat in, whereas a steel roof will dissipate the heat much more quickly. It’s all about thermal mass. Here in WA most steel roofs are of a light color, it’s interesting to see that the vast majority of new builds and reroofs here in Western Australia are in long run steel, not that long ago that tiles were the thing
I totally agree that tin is the way to go BUT why on earth is black the colour these days? I cant imagine being a roofer putting black iron up in summer, insane! Ive driven around new subdivisions of late and I would estimate 90% are black, where have all our coloured roofs gone?
A cool video and very in formative. Did the Canadians ever mention why steel/long run wasn't very common for residential roofing? I always found this a little strange as well as things like little to no stormwater systems from the down pipes on their roofing. Cheers
@@mesodan pretty happy we don't really have HOAs here in NZ although some areas (normally more affluent) can have some pretty extreme building covenants to abide by.
The thickness is 0.42mm. you can nick one side then rip it with your hands. This is controlled by steel companies who dictate the code. More profit as these very expensive $30 m2 , are ruined by hail. Any other roof is more expensive _$30 000+
Concrete tile roofs in a country with earthquakes was always a stupid idea. Membrane roofs only for very low pitch where you want it to leak. Slate roof if you win lotto. Pressed metal roofs dent too easily and look like absolute shit. Longrun it is. Good value, good looks, longevity, low maintenance, doesn't leak, doesn't kill you in an earthquake.
@@yingle6027I don't see why it couldn't. Have a decent pitch to it and it will shed snow better than asphalt, plus if you're concerned about loading, the battens can just be spaced closer. As for the temperature changes, concealed fixing methods can allow for longitudinal expansion and the sheet profile will handle the lateral expansion easily.
@@glenni249snow loads are massive. I'm from America and lived in Alaska and Montana near Canada. Up to 2 meters of snow and it has to be shoveled off. It's a safety issue getting on the roof and it's a safety issue if the snow has fallen for a long period and the snow is like an avalanche onto a person entering or exiting a door.
Metal roofs are just the ideal type of roof for NZ - tried and proven! They're relatively light in weight (compared with tiles) but *very* strong, and they add good structural strength which helps to deal with earthquakes.
Australia produces metal sheet material which seems to dominate our housing construction because it’s the only product produced for builders. Regardless of what products are better, metal sheet roofing it’s simply all that’s supplied on mass to the building industry and subsidised by the Australian government
I used to fix barn roofs in the UK. Most roofs I worked on were over 400 years old and still worked great. They were either natural tiles or thatch. I now live in NZ, builds here are shit and only built for 20 years which is pathetic
Practically all new houses in NZ are “cookie cutter” houses All look the same and they’re built as cheap as possible with highest profit by the same group of builders That’s why steel is predominantly used it’s quick and cheap! Oh for some decent Architect (not draftsperson) designed houses 😂
Both issues are easily solveable. Install a damper like rubber between the joists and the roof to reduce resonance. Paint with rubber paint, or buy roofing that is textured. Use standing seam roofing instead of corrugated. And the heat, just don't paint it dark? White is best for reflecting solar gain anyways. And of course, insulate.
My grandfather put a metal roof on his house in 1946. (This is the US). It is now 2024. The same roof installed in 1946 is still there and hasn't had a single leak in the past 78 years. I'm in that house right now typing this. If this roof lasts until 2046 I wouldn't be surprised. All we do is paint it occasionally.
@@linmal2242 The problem with the modern stuff is it is so thin and the coating is so thin. It SEEMS better, but it is extremely easy to scratch the coating while installing it, compared to the older iron, which usually came as bare steel and you painted it as soon as you installed it. So people have a modern "colour steel" roof and think it will be fine, and it rusts through in a tenth of the time of the older, thicker steel.
@@uncletiggermclaren7592 galvanised iron is a fraction of the thickness it once was. we have a galvanised fence erected in the 50's and it is still good. but it is so much thicker and stronger than the new stuff.
@@TaylerMade Oh yeah it was thicker, like three times as thick. My family have owned scrap metal yards since 1964. Quite a few times when I was a child, we scrapped whole industrial buildings, off sites so new buildings could be built. I remember a couple of times we got corrugated roofing off buildings, that had painted trademarks and batch numbers on the underside of it from the 1850s "Made in Sheffield, G.B." sort of thing. I remember quite well, because we had two old guys worked for us on light duties, and my twin and I used to be "cheeky" by carrying anything we found that had old trademarks on it, and ask them "Look, this is something you might have made, when you were young !". I think that sort of steel production for large sheets of steel didn't get underway here in New Zealand until the 20th century. They used to import the sheets, and roll them here.
I was a licensed builder on the east coast of Florida - hurricane alley - for 30 years (then an LBP in NZ for almost 20 years). I lived on the beach and had many opportunities to inspect and repair hurricane damaged roofs. After the worst hurricanes (about 1 - 2 per year) I would drive all up and down the beach to look at the hurricane damage. So in Florida, probably 90% of roofs are asphalt shingle, 8% are tile, and maybe 2% are metal. What I typically saw after a hurricane: Almost all asphalt shingle roofs were stripped bare, and the ceilings were flooded with rain. Most of the tile roofs had lost a substantial amount of tiles, often only on one side of the roof. But NONE of the metal roofs suffered any damage at all. However, there is this to consider: In the US, all roofs are built with trusses or rafters at 600mm on center, then 5/8" plywood is nailed (and often glued as well) onto the roof, followed by waterproof roofing felt (black paper). For metal roofs, the metal is then placed directly on top of the plywood + felt and screwed at a pattern specified in the Building Code. It's guaranteed for 50 years.
Concrete tile rooves are heavier as discussed, therefor requiring more battens rafters/trusses and bigger lintels. But the other reason they are specified less is because NZ has increased the earthquake demands on all buildings. Its hard to get enough bracing in the walls to hold the building up in an EQ.
Engineered trusses can easily handle the weight of tiles. Just wrap the roof and exterior walls in 12 mm plywood, like all US houses. Using gib for bracing is stupid beyond belief.
@@sunjamrblues The problem is not the extra structure to hold the concrete tiles up, it's because an earthquake causes the building to shift. The tiles add a lot of mass high in the home and an earthquake the bottom and top of the building will move relative to each other. The greater that roof mass is the more force it takes to accelerate and decelerate. Imagine holding a sledgehammer perfectly straight up and having to move it side to side without dropping it. You can definitely do it, but the structure of the house has to be much sturdier to handle the side loads and thus more expensive than it would otherwise need to be. A lighter roof is an overall much more cost effective choice, even if the concrete has a long service lifespan.
@@bradleylong3230 Same situation in California and Oregon, which regularly get earthquakes. Standard practice throughout earthquake zones in North and South America: Studs are at 400 o.c., trusses at 600 o.c., walls and roof all covered in 12mm plywood, then the cladding or roofing goes on top of the plywood. The trusses are tied to the concrete footings by a series of various straps, or even by cables. That's why when you see a video of tornado damage, a few houses in the midst of it all remain undamaged. Those are the newer houses, built with proper strapping and fasteners. The older houses were built similar to NZ, and they don't survive.
It's the same in Australia. My corrugated galvanised steel roof is 113 years old. Lightweight means a very simple roof frame. And it's inexpensive and so easy to work with. Never have to worry about cracked tiles in a hail storm either.
I would be VERY surprised if you still had the original roof material. 60 years at best unpainted. My home to was built before federation and has had a new corrugated iron roof fitted in the 60's. My father showed me the pictures of it before replacement and it had rusted through the galv in many areas. Mostly due to lime mortar used to build the chimneys. You can easily tell by the thickness of the steel.
@@dazaspc It has the original style Lysaght stampings underneath; slot headed screws with lead washers, painted (though now very faded), and I'm 80km from the coast. Plus, my neighbour who's known the house since 1931 told me it's all original. There are a few small rust holes which I block up with silicone as they appear, but it still has a long way to go. I've just had 30 years out of my galvanised rainwater tank, and that I do have to replace.
@@cool386vintagetechnology6 So it hasnt been exposed for many years or are you refering to stamped steel ceilings? Mine was made from Wattle and Daub still in ok condition.
@@adamali2886 People tend to sleep at night mate, the people living next to where I live had solar installed, they ran most of their electrical intensive amenities during the day, and anyway most people installing solar do it for the compounding savings they will receive from a private tributary power supply and if one is in necessitative need of power at night, getting a battery will help with that.
Reading peoples responses has been very interesting, but my preference for steel rooves is fairly prosaic. I just enjoy listening to the rain hitting the roof.
Sounds like you’ve only been in old badly insulated houses. It has to be completely pouring down before youll even hear the rain, let alone have it interrupting conversation in a reasonably insulated house.
@@TheShortStory As people have mentioned ceiling insulation nullifies bird noise and reduces rain noise to a pleasant background noise...Hail is still pretty loud though.
Ours is low pitched corrugated roof and its around 50 years old. We have replaced some sheets as they were getting rusty and painted it, should've painted it before to be honest. One of the biggest problems with metal roofs are new roofs rusting when they are nailed/screwed onto the roof as they rust by the screws. Need to paint the roof after they're installed even when replacing old sheets.
Was going to replace to concrete tiles with a metal roof. They were never looked after. I might also redo the fences around the property with metal as well like is popular in Australia. It's just so much less maintenance.
Realistically the most important thing that drove this is quick and easy installation. Most average houses in NZ are built before they're sold. The future owner has no word in what materials are used. It is in the builders' best interest to get houses done quicker, cheaper and get to market faster. Of course, that doesn't mean that this video is incorrect, just wanted to point out a significant business factor that I think plays a lot bigger role in this than the benefits of the material themselves. Especially in the past 10-15 years, when NZ population grew by about 25% and there simply weren't enough builders and houses to keep up with the demand.
I am Canadian and a roofer and I will only cover my buildings with metal unless it is a greenhouse. Shingles have far too many seams and it just does not last like metal does. I look for thicker metal with a baked on paint. that keeps the rust and dents away. One important difference in NZ is also that so many people use rain water cisterns while here in Canada we often drill wells. Collecting rainwater from an asphalt roof is disgusting. Metal is good though
I used to watch the Kiwi tiny house channel. But every single one was black metal and exposed timber. It was the most boring architectural display on earth.
@@mabamabam I think because we went for years with the same white houses with orange/grey/brown roofs. It still seems kind of fresh to have grey/black homes and the hide well against dark NZ bush.
i prefer metal roofs, better waterproofing... but with all new housing projects, it depends on design. sadly people are filling the whole blocks and use internal gutters that are difficult to waterproof if they arnt designed right. the idea of having an internal gutter just doesnt sit well with me long term.
Funny that concrete tiles declined in use and installation between 2010 and 2019, I wonder what events happened Oh yeah three major earthquakes, whoops (For those who don't know, Christchurch 2010 and 2011, and Kaikoura 2016.)
I was swayed by my builder 20 years ago to go with concrete tiles and boy do I regret that now. Every time the gutters need cleaning a bloody tile gets broken and needs to be replaced. Something else I didn't consider was that a tin roof makes your home more *secure* that a concrete tile one. Takes less than a minute once on the roof to lift a couple of tiles (they only secure every second row) and you are into the house. Not so easy or quite with corrugated iron.
@@DavidLee-cw6ci "5 Tactics of Rooftop Burglars and how to stop them Recently there has been an increased volume of residential and business break ins via roofs. Many roofs have become the weakest point-of-entry and burglars are taking advantage of this at both business and residential premises. After gaining access to the inside of the roof, the burglars frequently locate the alarm system by following cables in the roof and then proceed to rip out or cut all cables to disable the alarm system. " August 15, 2022 Security Notices
Because a Metal Roof will last a life time, unlike Tiles which will last maybe 20 to 40 years before problems, with Tiles you can run into structural issues in modern times, Americans have no idea on roofing using their vinyl tiles. Look around Australia, there are buildings with Metal Roofs that have 100 year old steel roofs.
I just replaced my concrete tiles on my 1940s state house…original tiles. I decided on getting terracotta tiles. It looks amazing! The house has a really steep pitch so I didn’t want to do colour steel, didn’t think it would look right. I also felt that terracotta gives your 100+yrs, natural product and no more expensive than colour steel. I’m surprised more people don’t get this on these houses designed to take the load of a heavy roof.
@@HaggisPower yup really strong. You could take them off after 80+ yes clean them and put them back on. The tiler had just done the whole Dunedin railway station and that’s what they did!!
Im in the UK, All my homes had slate tiles. Underneath them is a membrane and batons like you guys do for metal tile roofs. Definitely no plywood. Although our flat roofs have plywood or OSB usually covered by rubber, fibreglass or bitumen.
Metal for me because fire will only mean needing to waterblast and paint assuming a fire proof situation under it. For cladding same again or fibrecement. Rockwool under both and steel supports, not timber. Timber only under the rockwool. Context, adjacent to Northland forest/bush. Only a matter of time before a fire comes through. Insurance doesn't replace irreplaceable personal items...
Great video. As for flat roofs a tpo membrane is better than butynol mostly because at the substrate joints you can double lap the tpo and weld the joints. I agree as a designer and quantity surveyor my preferred metal roof profiles are corrugated or the diamond profiles LT7 and BB900. Not a hurge fan tray roofs or 5 rib myself.
In Alaska, metal roofs are expensive, but they are considered premium. A pro and con is that snow slides off them. This prevents heavy snow loads on your house, but also creates safety concerns. The other major pro is that asphalt tiles catch fire pretty easily from embers whereas metal does not. This is not a small feature for remote places. We have forest fires every year somewhere in the state.
Interesting didn't think I'd learn anything reading the comments, but I've never been to the states (I am from NZ) lol.
Well, for whatever reason it's very cheap here. Sometimes even used as building cladding. Where I grew up basically every house used it, and plenty of farm sheds too.
In Oz it's closer to 100% metal roofs, and usually colorbond (which has a 30 year warranty, and more like 70 year+ lifespan) and bushfire resistant which matters for us! Honestly, Aussies don't understand why people would use shingles (tiles are fine too)
@@darrenmx I chose plain gal (silver) so it would reflect heat, with Colorbond guttering. A lot of people in Brisbane do the same. All the old steel roofs in the area were painted a standard red, but there's none left in my street now.
I would imagine sliding is a function of the angle, but tiles on a sharp angle would be tricky
Another thing to consider is if you want to capture the water from the roof for drinking. Steel is great. Asphalt is poisonous.
It takes at least 5mm of rain on a concrete tile roof before any water starts getting into the water tank.A metal roof you harvest every rain drop
Silicone spay sealing concrete makes it shed water better. It also helps prevent lichen. Also prevents tiles cracking in freezing weather.
- yep, that is the Australian story too... Nowadays all rainwater installs tend to be flagged as "garden and grey water use only". I have been so many places that without the rainwater tank, we'd all be dead - add a particulate and carbon filter - the best water around (avoid roofs with lead flashing or lead paint - Most tin (galv/zinc) ) roofs in Aussie never get painted (historically lead paint isn't great for drinking water) - colorbond lasts - a lifetime (until it doesn't, hopefully it is truly nontoxic) we all get thinner materials as the years go on, reducing useful life, better to go as heavy as is available..
@@kadmow Good to know. Soon lots of home owners will be taking loans to buy a few sheets of tin..
Earthquakes earthquakes & earthquakes. So glad here in Christchurch when the earthquakes struck to have a corrugated iron roof. All those people with concrete of old clay ties with problems. Concrete tiles can be seen a lot on post WW2 houses. The house next door, now gone, was a concrete house with concrete tiles - post WW2 material shortages.
It's bizarre, because I saw loads of concrete tile roofs at the time that had jumped ship, but ours remained completely intact - we had about 15 tiles jiggle down a few cm, but that was it. I thought the builders back in the 70s had done a bit of a $hit job only wiring every fourth tile down, but from what I saw on other places, that was actually extremely diligent
Yup, that's what I wanted to say. I'd add that older people, who I suspect are the main house builders, have seen more earthquakes and the results.
Concrete tile was still very common on new builds until about the mid 2000's, here in the top part of Shirley (technically Marshlands) probably 60% are concrete tile built in the mid 2000's. The roofs held up very well, not aware of any rebuilds, and didn't see any roofing work post quakes. Most of the 1950's state houses in different suburbs also seemed to do pretty well, but I remember seeing roof damage in some T3 areas, Linwood, Woolston, Aranui etc.
@@petercroft9895 You can't beat a well built house. We were living in a Rimu framed, brick clad, concrete tiled house during the Chch earthquakes. The house was built in the 60s and the original owner had the builders go the extra mile. Every pile was double wired to the floor beams. The bricks were hollow with rebar through them and every tile was wired on. The chimney was short and fat. Nothing moved or failed on that house.
We had those in Australia as well. You could always tell an Austerity built home as they used fewer beams, frames, etc for the roof. They always had characteristic dips along the peaks. Most if not all by now have been replaced. Concrete tiles were a thing in Australia from the 60's untill the late 70's when homes were still being made from double brick. I had a home with them and would never get another due to the dust in the roof space and the fragility and need to repoint. Premium builds got terracotta tiles that were much better durability wise and were a lot lighter. Most people went for steel.
And the sound of rain on a tin roof is fantastic
Nothing like laying in bed on a cold rainy night listening to the rain. Almost as good as sex.
Er without insulation too loud, clay tiles so much quieter
@@Froggability We have ceiling insulation with a higher R factor number than wall insulation.
I love the sound of rain on a metal roof. Listening to it right now actually.
as someone who sleeps in a iron shed, imma take that as sarcasm. so loud cant hear anything else
With butol roofs we fixed the movement issue by gluing a silicon backed tape over all the joins on the plywood before laying that way the butol had a bit more freedom to move, this is from a roofer in nz
Most house in Australia also now have colour bond roofs, including my house! They are safer and stronger and last well, longer than I'll live.
They are cheaper and quicker to repair as well if storm damage happens.
@@shadowbanned5164 , yep!
One of those things we have but never think about 😂 loving all this "sudden" kiwi content yt is recommending.
As an NZ homeowner I always go metal because I get up on my roof for maintenance work and metal is safe for walking on..No problem water blasting it either or painting it.
I have a few houses with a variety of roofing materials and have owned others and been responsible for larger residential apartment and commercial buildings over the years. They all have their pluses and minuses. The current houses are between forty and fifty years old. The iron roofs have required painting and attention to nails working up or tech screw isolators falling off, and the concrete ones repointing and the odd tile replacement- I haven't bothered to paint them as I consider it primarily cosmetic. I think both are good as long as they are done properly and with good quality products at the beginning, and then looked after. The good thing with concrete tiles is that they are immune to corrosion unlike iron roofs which I have seen corrode through from the back by the gutter and corrosion at the laps, as well as failure in the colour coating. The only metal roofing I would use if I was building would be the heavier gauge long run clipped (no penetrations) commercial stuff. It is thicker and very strong and doesn't buckle when you look at it like domestic iron sheet or tiles which are very thin these days. The penetrations caused by tech screws or nails in iron roofs have been the cause of most of my problems over the years as well as poor workmanship on flashings. Like everything there is no perfect system.
I enjoyed reading your comments.
Steep roof of any kind will last longer. Nobody seems to talk about this.
My house has 50 year asphalt shingle in a hot environment in California, but I have a steep roof and very well ventilated attic. The roof will last longer than that, longer than 50 years
The early demise most asphalt shingle roof is in proper ventilation in the attic because of code violations when construction is done. Almost 100% of the time ventilation is not properly done. Cooks off the roof and the underlayment
@@steveperreira5850interesting
In Australia we have nearly no asphalt roofing
Nearly all concrete tiles or corrugated metal
i feel like you overlooked the location of your buildings. are your rusty builds close to the ocean? sea winds carry salt that f steel up. you use aluminum sheets and flashings. and if your around rotorua ways geothermal shit is a thing too. ahhh perfection is obtainable just expensive
Long run stands up in storms and doesn’t catch ablaze with falling embers. I prefer standing seem myself.
I have a lot of experience with asphalt shingles in Canada where they are used almost exclusively. I think that you have to be out of your mind to use asphalt shingles in NZ. 1. Proper installation cannot be assumed, especially when many NZ roofs are irregular and the guys nailing the shingles are low on the construction trade ladder (always, everwhere) . And you can't see what they are doing. (a) Besides what do you know about what is a proper job? (b) Assuming that the roofer- boss is competent and honest. 2. I don't know what NZ UV will do to them, but I do know what wind will do. The shingles will lift off. Does NZ have heavy wind? How heavy? How often? See also point #1, above. 3. Shingle roofs need to be replaced periodically. They rarely last the estimated life. Roofing over them is OK, but will reduce the life of the new layer. (Will your roof (in NZ made of those thin sticks) take the added weight?) You can't put on a third layer; you need to strip the roof. More work, dumping fees, lots of expense. And you still will have only a temporary asphalt shingle roof. (4) Asphalt shingles is a new material in NZ How long did it take NZ to figure out the changes in construction code and materials that resulted in an epidemic of leaky houses and commercial buildings?
Long run metal is also the best by far for mounting Solar Panels!
Out here in rural Canada tin rooves have become much more common. They're loud but very durable. Won't go back to asphalt
Loud? How can you not love the sound of rain?
@@blackterminal I've got concrete tiles and love how quiet it is.
East coast of Oz and it is rare to see a new build done tiles. Colour Bond metal roofs need zero maintenance as a rule and are so quite you have to look outside to see if it is raining. Old corrugated iron rooves were noisy but using modern installation methods have fixed that problem.
@@duster8100 myself I like noisy rain on the roof.
Yeah it's really about the install, have to put rubber down between the metal and the joists or you get resonance issues. Also depends a bit on the guage and type.
I live in NZ I have had “tin” roofs and concrete tile both. These are the most common types here. Steel is far superior. Concrete tiles are fine until the grouting and tiles start cracking. After 18-20 years in my experience.
Hi, i feel i need to jump in here and correct some misinformation... for clarity, i supply and install in Auckland Concrete, Clay ( you didn't mention), and slate.
For lifespans of the roofing products you've mentioned lets go by what manufacturers are prepared to guarantee their product for with metal roofing guaranteed for the least and, in many cases, a third of the lifespan.
The maintenance on metal roofing far exceeds that of the others.
Concrete tiles do not require repainting. This is cosmetic only - no idea why you mention pitting etc.
Slate does not require ply sheeting - it is the same as Concrete and clay .. underlay and battens.
The meterage rates you have mentioned are generally off.
And to be honest if metal roofing is that per m2 i clearly need to get my drill out .......
I’m glad somebody came in here and defended slate and concrete. Done right, by design and also by installation, there should be no underlayment required. Go to Switzerland and check it out, buildings that are hundreds of years old with large slate format.
In the USA where I am at, the premature demise of asphalt shingle is overheating because of improper and in adequate attic ventilation below. It is almost never done right. And the inspectors don’t check it out properly.
Hailing from the UK, slate tile roofs are common. Probably the the best roofing material? Can last in excess of 100 years with no maintenance.
If you've been in a decent earthquake, you never forget the sound of heavy tiles rattling above you. Having experienced the Canterbury quakes, I will always prefer a single story weatherboard house, with longrun roofing. Everything needs to be able to flex and move without falling on the occupants.
In Vancouver BC some houses have cedar shingle roofs. I had my roof redone last year with asphalt shingles. I did look into alternatives, but none were readily. available. ( Material ,trades, codes,)
As an Aussie most of our roofs are metal/ Colourbond too.
Cost & reliability would be my explanation for the popularity of long-run roofing. With most roofing work being subcontracted for a fixed price the installer is aiming to fit the roof ASAP so they can achieve turnover, it is generally easier to see if shortcuts have been taken with a long-run roof while other roof types can look alright but have hidden problems. Various long-run designs with penetration features can have problems also which is why gable end or standard hip valley designs cause the least problems. Color steel is competitively priced although when the roof contractor adds 40% to the material & labor rates to the main builder who adds their margin to the customer as well you can see why expensive materials quickly become uneconomic for most house buyers.
The Christchurch earthquake has made a major difference in concrete tile sales, I remember that 20 years ago there was a significant % of houses were built with concrete tiles however it is rare to see them installed now.
Terrific video. 👏👏👏
we use tin here in aus and i really like them. i think they look great and are really easy to do.
Great video mate. Re membrane pricing - more like $150-$180m2 depending on product and size/difficulty these days.
it would take longer and probably cost as much to clad a roof in 18mm marine grade playwood as it would to do a metal roof, then the shingles go on after, timber is so much more expensive in nz than North america, same reason all house over there the walls are all cladded in chip board before the cladding and we just put up building paper and a few sheets of 7mm for bracing
When you omit the plywood for shingles, the roof needs to be braced, interesting that this is preferred over plywood in NZ
We have metal roofs in PH made of galvanized iron/steel but they rust and develop holes or leaks easily, sometimes within 1 or 2 years.
They don't look nice and grey like in NZ and they're usually covered with paint. Maybe that's the reason for the rusting?
Bro where did you get the video footage from at 2:50 that’s my home town I recognised it straight away😂😂
I prefer a roof that lats a 100 years with proper maintenance like concrete tiles, had mine for 35 years no issues. Leaky homes has caused lots of issues for NZ consumers customers as no one in NZ ever assumes responsibility builders, manufacturers, certifying agencies i.e local councils or government watching from the side.
I can of a couple more reason's. Durability and low maintenance being number one. Our metal roof is over 50 years old. Had it resprayed and checked. Some of the old leadheads were replaced with tek screws. Also it was easy to remove the old gas fire. And it looks like new again.
Other consideration is after the earthquakes. Houses with metal roofs had less weight up top and kept the frame together.
Houses with tile tended to collapse or warped.
Id say metal is superior in most cases. The only concern is high wind storms and we've had alot in our region. But it did survive but is still a concern for me.
Other being heavy rain cause of the noise. We can barely talk in our house when it rains heavily. Which we never got with a tile or the flat roof home. Also the noise of light planes and helicopters. Seem to be even worse under a steel roof. If we had more noise insulation maybe it would be perfect.
I am in the Philippines where we built a new home four years ago and covered it with metal roofing. The metal roofing is .6 mm in thickness made of mild steel and factory painted. When you look at it today you’ll see that each and every panel is rusting at the joint of the next overlapping sheet. It’s only surface rust for now but soon I’m sure it will eat its way through. What do I do to control this rust?!
Sounds like bad quality. Get some rust stopper treatment and treat the rusted areas. Sand your roof and repaint. If you don't you'll get holes.
I've had two houses with galvanized iron roofs only needing replacement after 100 years. I've not got much faith that the current metal roofs will last that long
Are these sqm prices in nzd or usd?
Slate roofs do not need a substrate such as ply; often mount on battens (as per the interlock tiles at 5m) into which they are nailed. Historically were in effect a lightly ventilating roof with no membrane layers or ply though planking was used for bigger structures such as churches and cathedrals. A better system is the French "crochet" (hook) mount which if using stainless steel not only is extremely durable but enables rapid repairs in rare event of damage and age-related deterioration (repairing 140 + year old slate roofs with delaminating tiles or battens rotted/wormed needing replacement) or modifications such as installing roof lights or dormers. The advantage the crochet fix has is prevents wind lift (and was introduced in the Western regions such as Brittany where wind exposure is very high) as hooks to base whereas nails fix at top. Very rapid tile fitment to battens with no fixings in effect; just tightly gripping metal clips. On remedial work not using nails and potentially damaging internal cladding etc from shocks from hammering can be important and stainless screws are not cost effective on price and labour compared to speed of the crochet method and ease of recycling. Personally advocated ,for extra strength on every roof that I built, to incorporate ply or planking for historic aesthetics sympathetic to the building and breather membranes but choice nonetheless remains use tantalized battens and stainless crochets and good Welsh slate for the best aesthetic and definitely good for at least 100 years; much more durable than anything else. Whereas the human eye likes minimalist aesthetics it lingers on fractals and curves. A slate clad roof built on a green timber pegged-oak traditional roof drying to add sumptuous curves is my favourite; strong, durable, aesthetics to die for.
Downsides of metal roofing? How’s the rain patter?
What’s the minimum pitch fo metal roofs in New Zealand?
I don't like how NZ houses are being built now. They aren't! I have only seen town houses go up. Where we used to build 1 house on a section, now, there are 5 to 10 houses. It looks ugly. It looks 3rd world. We need to expand by creating new suburbs.
good stuff mate. video like this is so good for the industry. keep on learning and teaching !! thanks !
New Zealand also thought non-thermally broken aluminium joinery was a great idea too. Double glazing means nothing if it's wrapped up in a big heat sink. Thankfully this has changed, but I've love to see a return to timber joinery. The Europeans still swear by timber, aluminium is their least preferred option and PVC is their standard offering. They know winter as much as anyone while the average kiwi is often found in substandard housing with a winter power bill that could make Bill Gates cry.
I mean metal roofs are the best roofs or at least one of the best roots of all time that you can get. So I don't blame them for getting metal roofs and they're so much more options nowadays than what there used to be.
They don't have to worry about hail Storms !
Better because you can hear the rain. Great for sleeping
A dark anything roof creates a very hot roof space. But concrete tiles hold that heat in, whereas a steel roof will dissipate the heat much more quickly. It’s all about thermal mass. Here in WA most steel roofs are of a light color, it’s interesting to see that the vast majority of new builds and reroofs here in Western Australia are in long run steel, not that long ago that tiles were the thing
I totally agree that tin is the way to go BUT why on earth is black the colour these days? I cant imagine being a roofer putting black iron up in summer, insane! Ive driven around new subdivisions of late and I would estimate 90% are black, where have all our coloured roofs gone?
A cool video and very in formative. Did the Canadians ever mention why steel/long run wasn't very common for residential roofing? I always found this a little strange as well as things like little to no stormwater systems from the down pipes on their roofing. Cheers
I know steel is banned by HOAs in some areas of the US for architectural reasons.
Apparently they are “too industrial” looking.
@@mesodan pretty happy we don't really have HOAs here in NZ although some areas (normally more affluent) can have some pretty extreme building covenants to abide by.
Metal roofs are affordable.
In the real world, we purchase what we can afford.
It's really this simple 🙂🙏
Didn't NZ invent corrugated iron? My dad had a 1890 house with it in Dunedin. It may have been a newer addition of course
gotta be the most common in Australia too.
A better question would be why does any Australian use tile roof? They weight too much. As for the USA. Why something that can burn.
Damn YT did it again ! I live in a flat in Portugal so why am I watching this ?
I feel he missed maintenance needed for metal roofs, it absolutely is not just a wash, they definitely need repainting every 10 to 15 years or so.
Nothing sounds better than rain on an iron roof.
The thickness is 0.42mm. you can nick one side then rip it with your hands. This is controlled by steel companies who dictate the code. More profit as these very expensive $30 m2 , are ruined by hail. Any other roof is more expensive _$30 000+
Lighter,very durable,safer in earthquakes and because of the lighter weight the supporting structure suffers less damage in a quake.
Concrete tile roofs in a country with earthquakes was always a stupid idea. Membrane roofs only for very low pitch where you want it to leak. Slate roof if you win lotto. Pressed metal roofs dent too easily and look like absolute shit. Longrun it is. Good value, good looks, longevity, low maintenance, doesn't leak, doesn't kill you in an earthquake.
My house has a 50 year old steel roof.. Not rusting and sounds great when it rains... Stick your 10 or 15 year covering.
Guy has one of the thickest kiwi accents I've ever come across - and I'm a kiwi lol
Hmm, didn't know that about concrete tiles
Houses are governed by earthquake regulations that’s why there are few problems when they have earthquakes, which are not uncommon.
So why do they use asphalt roofing in Canada? They just like it costing more and taking longer?
Heavy snow and temp changes. Metal roof can't handle that.
@@yingle6027I don't see why it couldn't. Have a decent pitch to it and it will shed snow better than asphalt, plus if you're concerned about loading, the battens can just be spaced closer.
As for the temperature changes, concealed fixing methods can allow for longitudinal expansion and the sheet profile will handle the lateral expansion easily.
@@glenni249 Near 100 deg celcius yearly temp difference in places in Canada, whatever their roofs it'd have to be pretty solid!
@@glenni249snow loads are massive. I'm from America and lived in Alaska and Montana near Canada. Up to 2 meters of snow and it has to be shoveled off. It's a safety issue getting on the roof and it's a safety issue if the snow has fallen for a long period and the snow is like an avalanche onto a person entering or exiting a door.
Because they want to help the Australian Iron ore industry maybe 🤔
All New Zealand metal as far as I'm aware.
Metal roofs are just the ideal type of roof for NZ - tried and proven!
They're relatively light in weight (compared with tiles) but *very* strong, and they add good structural strength which helps to deal with earthquakes.
Australia produces metal sheet material which seems to dominate our housing construction because it’s the only product produced for builders.
Regardless of what products are better, metal sheet roofing it’s simply all that’s supplied on mass to the building industry and subsidised by the Australian government
I used to fix barn roofs in the UK. Most roofs I worked on were over 400 years old and still worked great. They were either natural tiles or thatch.
I now live in NZ, builds here are shit and only built for 20 years which is pathetic
Practically all new houses in NZ are “cookie cutter” houses All look the same and they’re built as cheap as possible with highest profit by the same group of builders
That’s why steel is predominantly used it’s quick and cheap! Oh for some decent Architect (not draftsperson) designed houses 😂
Same thing in Australia. Little houses made of ticki tacki.
This Maori man knows a lot about building houses.
A dark metal roof creates a sauna, under it.
the noise in a rainstorm is thunderous also
Both issues are easily solveable. Install a damper like rubber between the joists and the roof to reduce resonance. Paint with rubber paint, or buy roofing that is textured. Use standing seam roofing instead of corrugated. And the heat, just don't paint it dark? White is best for reflecting solar gain anyways. And of course, insulate.
Me, a Filipino: you guys have non-metal roofs?
My grandfather put a metal roof on his house in 1946. (This is the US). It is now 2024. The same roof installed in 1946 is still there and hasn't had a single leak in the past 78 years. I'm in that house right now typing this. If this roof lasts until 2046 I wouldn't be surprised. All we do is paint it occasionally.
Yep. Keep the rust away and the roof should last as long as the wood that holds it up.
@@SteveWithers Well the modern roof sheeting has excellent coating systems much improved since 1946 !
@@linmal2242 The problem with the modern stuff is it is so thin and the coating is so thin. It SEEMS better, but it is extremely easy to scratch the coating while installing it, compared to the older iron, which usually came as bare steel and you painted it as soon as you installed it.
So people have a modern "colour steel" roof and think it will be fine, and it rusts through in a tenth of the time of the older, thicker steel.
@@uncletiggermclaren7592 galvanised iron is a fraction of the thickness it once was. we have a galvanised fence erected in the 50's and it is still good. but it is so much thicker and stronger than the new stuff.
@@TaylerMade Oh yeah it was thicker, like three times as thick.
My family have owned scrap metal yards since 1964. Quite a few times when I was a child, we scrapped whole industrial buildings, off sites so new buildings could be built.
I remember a couple of times we got corrugated roofing off buildings, that had painted trademarks and batch numbers on the underside of it from the 1850s "Made in Sheffield, G.B." sort of thing.
I remember quite well, because we had two old guys worked for us on light duties, and my twin and I used to be "cheeky" by carrying anything we found that had old trademarks on it, and ask them "Look, this is something you might have made, when you were young !".
I think that sort of steel production for large sheets of steel didn't get underway here in New Zealand until the 20th century. They used to import the sheets, and roll them here.
I was a licensed builder on the east coast of Florida - hurricane alley - for 30 years (then an LBP in NZ for almost 20 years). I lived on the beach and had many opportunities to inspect and repair hurricane damaged roofs. After the worst hurricanes (about 1 - 2 per year) I would drive all up and down the beach to look at the hurricane damage. So in Florida, probably 90% of roofs are asphalt shingle, 8% are tile, and maybe 2% are metal. What I typically saw after a hurricane: Almost all asphalt shingle roofs were stripped bare, and the ceilings were flooded with rain. Most of the tile roofs had lost a substantial amount of tiles, often only on one side of the roof. But NONE of the metal roofs suffered any damage at all. However, there is this to consider: In the US, all roofs are built with trusses or rafters at 600mm on center, then 5/8" plywood is nailed (and often glued as well) onto the roof, followed by waterproof roofing felt (black paper). For metal roofs, the metal is then placed directly on top of the plywood + felt and screwed at a pattern specified in the Building Code. It's guaranteed for 50 years.
There not obsessed. It like Australia.. metal is cheaper.
Earth quakes are the main reason why metal roofs are used mostly. Concrete tiles are more dangerous in an earthquake
Very true, I never thought about that
the same reason why most home were made from timber not brick
We love steel roofs in Oz too, and we don't have earthquakes like you guys do.
incorrect
@@VanillaMacaron551but we love tiles also
And one big benefit of the corrugated metal roof is the quality of the rain water is cleaner and the best for drinking water.
Concrete tile rooves are heavier as discussed, therefor requiring more battens rafters/trusses and bigger lintels. But the other reason they are specified less is because NZ has increased the earthquake demands on all buildings. Its hard to get enough bracing in the walls to hold the building up in an EQ.
Engineered trusses can easily handle the weight of tiles. Just wrap the roof and exterior walls in 12 mm plywood, like all US houses. Using gib for bracing is stupid beyond belief.
@@sunjamrblues The problem is not the extra structure to hold the concrete tiles up, it's because an earthquake causes the building to shift. The tiles add a lot of mass high in the home and an earthquake the bottom and top of the building will move relative to each other. The greater that roof mass is the more force it takes to accelerate and decelerate. Imagine holding a sledgehammer perfectly straight up and having to move it side to side without dropping it. You can definitely do it, but the structure of the house has to be much sturdier to handle the side loads and thus more expensive than it would otherwise need to be. A lighter roof is an overall much more cost effective choice, even if the concrete has a long service lifespan.
@@bradleylong3230 Same situation in California and Oregon, which regularly get earthquakes. Standard practice throughout earthquake zones in North and South America: Studs are at 400 o.c., trusses at 600 o.c., walls and roof all covered in 12mm plywood, then the cladding or roofing goes on top of the plywood. The trusses are tied to the concrete footings by a series of various straps, or even by cables. That's why when you see a video of tornado damage, a few houses in the midst of it all remain undamaged. Those are the newer houses, built with proper strapping and fasteners. The older houses were built similar to NZ, and they don't survive.
It's the same in Australia. My corrugated galvanised steel roof is 113 years old. Lightweight means a very simple roof frame. And it's inexpensive and so easy to work with. Never have to worry about cracked tiles in a hail storm either.
I would be VERY surprised if you still had the original roof material. 60 years at best unpainted. My home to was built before federation and has had a new corrugated iron roof fitted in the 60's. My father showed me the pictures of it before replacement and it had rusted through the galv in many areas. Mostly due to lime mortar used to build the chimneys. You can easily tell by the thickness of the steel.
@@dazaspc It has the original style Lysaght stampings underneath; slot headed screws with lead washers, painted (though now very faded), and I'm 80km from the coast. Plus, my neighbour who's known the house since 1931 told me it's all original. There are a few small rust holes which I block up with silicone as they appear, but it still has a long way to go. I've just had 30 years out of my galvanised rainwater tank, and that I do have to replace.
@@cool386vintagetechnology6 So it hasnt been exposed for many years or are you refering to stamped steel ceilings? Mine was made from Wattle and Daub still in ok condition.
@@dazaspc it's the exterior roof.
As a sparky that does Solar in NZ, I'm so glad most of our roofs are either corrugated or trapezoidal. Concrete tile is an absolute pain
what happens when there is no sun
@@adamali2886 People tend to sleep at night mate, the people living next to where I live had solar installed, they ran most of their electrical intensive amenities during the day, and anyway most people installing solar do it for the compounding savings they will receive from a private tributary power supply and if one is in necessitative need of power at night, getting a battery will help with that.
Iron works. 25+ years minimum .55 mm thick.
@@greywolf7422we have solar installed to ensure continuity of supply. We have 3 freezers, 2 fridges. Home kill and wild game plus vege garden.
as a roofer, i hate you. 🤣🤣
Reading peoples responses has been very interesting, but my preference for steel rooves is fairly prosaic. I just enjoy listening to the rain hitting the roof.
That’s exactly the reason I don’t like metal roofs: too loud when it rains, hails or birds decide to have a party on top of it
Sounds like you’ve only been in old badly insulated houses. It has to be completely pouring down before youll even hear the rain, let alone have it interrupting conversation in a reasonably insulated house.
@@TheShortStory (anticon insulation sorts that out...)
@@TheShortStory As people have mentioned ceiling insulation nullifies bird noise and reduces rain noise to a pleasant background noise...Hail is still pretty loud though.
If you're thinking of building or re-roofing your house in NZ and installing solar, we love long run metal roofs.
One reason is that metal roofing is considered a light roof which makes it easier and cheaper to design the trusses.
I think the Canterbury earthquakes had a hand in the reduction of concrete tile rooves.
Also on roofs.
@@biggest23 Bugger! Thanks for the spell check!
@@stevedunlop9623 ….No worries brother, we’re all in this cultural maintenance routine together mate.
I have a relatively low-pitched metal roof and it's starting rust at the overlaps. May have to replace it with some other material in the near future.
Ours is low pitched corrugated roof and its around 50 years old. We have replaced some sheets as they were getting rusty and painted it, should've painted it before to be honest. One of the biggest problems with metal roofs are new roofs rusting when they are nailed/screwed onto the roof as they rust by the screws. Need to paint the roof after they're installed even when replacing old sheets.
@@bFORCe2003better use some profile that allows the screws to be concealed
Was going to replace to concrete tiles with a metal roof. They were never looked after. I might also redo the fences around the property with metal as well like is popular in Australia. It's just so much less maintenance.
Internal gutters and flat roofs are idiotic.
Realistically the most important thing that drove this is quick and easy installation. Most average houses in NZ are built before they're sold. The future owner has no word in what materials are used. It is in the builders' best interest to get houses done quicker, cheaper and get to market faster. Of course, that doesn't mean that this video is incorrect, just wanted to point out a significant business factor that I think plays a lot bigger role in this than the benefits of the material themselves. Especially in the past 10-15 years, when NZ population grew by about 25% and there simply weren't enough builders and houses to keep up with the demand.
hit the nail on the head 😉
I am Canadian and a roofer and I will only cover my buildings with metal unless it is a greenhouse. Shingles have far too many seams and it just does not last like metal does. I look for thicker metal with a baked on paint. that keeps the rust and dents away.
One important difference in NZ is also that so many people use rain water cisterns while here in Canada we often drill wells. Collecting rainwater from an asphalt roof is disgusting. Metal is good though
Concrete tile roofs performed very badly during the Christchurch earthquake. After that they slowly dropped in popularity in NZ
Maybe add the kiwi’s obsession with having everything black too… 😂😂😂😂😂
I used to watch the Kiwi tiny house channel. But every single one was black metal and exposed timber. It was the most boring architectural display on earth.
@@mabamabam yea I thought the same thing….
@@mabamabam I think because we went for years with the same white houses with orange/grey/brown roofs. It still seems kind of fresh to have grey/black homes and the hide well against dark NZ bush.
We New Zealander's sure do love our black houses 😂
Here I thought it was Metal music they were referring to in the headline 😆 that’s probably true as well 🤘🏻
i prefer metal roofs, better waterproofing... but with all new housing projects, it depends on design. sadly people are filling the whole blocks and use internal gutters that are difficult to waterproof if they arnt designed right. the idea of having an internal gutter just doesnt sit well with me long term.
Funny that concrete tiles declined in use and installation between 2010 and 2019, I wonder what events happened
Oh yeah three major earthquakes, whoops
(For those who don't know, Christchurch 2010 and 2011, and Kaikoura 2016.)
Tile roofs are ugly IMO. This is not just a NZ thing, most Aussies use colourbond steel roof now. I despise tile roofs and would never choose one.
Its also an earthquake zone so you probably don't want a couple of tonnes of ceramic tiles on top of you when it hits :D 🤔😆
I was swayed by my builder 20 years ago to go with concrete tiles and boy do I regret that now. Every time the gutters need cleaning a bloody tile gets broken and needs to be replaced. Something else I didn't consider was that a tin roof makes your home more *secure* that a concrete tile one. Takes less than a minute once on the roof to lift a couple of tiles (they only secure every second row) and you are into the house. Not so easy or quite with corrugated iron.
Depends on tile. I'm 110kg an never broke one.
I have never ever ever heard of a house getting robbed by an intruder removing roof tiles. Talk about imaginary problems.
@@DavidLee-cw6ci "5 Tactics of Rooftop Burglars and how to stop them
Recently there has been an increased volume of residential and business break ins via roofs.
Many roofs have become the weakest point-of-entry and burglars are taking advantage of this at both business and residential premises.
After gaining access to the inside of the roof, the burglars frequently locate the alarm system by following cables in the roof and then proceed to rip out or cut all cables to disable the alarm system. " August 15, 2022 Security Notices
@@DavidLee-cw6ciwell I guess now the gig is up. Watch out, I'm coming in like Kris Kringle, minus the chimney.
And added bonus is the gentle ear deafening pitter patter of rain on the iron roof. It's lovely, continue the conversation after the rain stops.
Funny, in South Africa these metal roofs, we call them ‘sinkplaat’ roofs, have been used forever and especially on farm houses.
Zinc plate?
@@dubplateriddim yes
Because a Metal Roof will last a life time, unlike Tiles which will last maybe 20 to 40 years before problems, with Tiles you can run into structural issues in modern times, Americans have no idea on roofing using their vinyl tiles. Look around Australia, there are buildings with Metal Roofs that have 100 year old steel roofs.
Very thorough but one type of roofing that is good but rare is cedar shake roofs. These can last 40-50 years and look amazing.
I just replaced my concrete tiles on my 1940s state house…original tiles. I decided on getting terracotta tiles. It looks amazing! The house has a really steep pitch so I didn’t want to do colour steel, didn’t think it would look right.
I also felt that terracotta gives your 100+yrs, natural product and no more expensive than colour steel. I’m surprised more people don’t get this on these houses designed to take the load of a heavy roof.
Are they strong? I dread walking on concrete tiles...
@@HaggisPower yup really strong. You could take them off after 80+ yes clean them and put them back on. The tiler had just done the whole Dunedin railway station and that’s what they did!!
Good video Josh, always enjoy it
Im in the UK, All my homes had slate tiles. Underneath them is a membrane and batons like you guys do for metal tile roofs. Definitely no plywood. Although our flat roofs have plywood or OSB usually covered by rubber, fibreglass or bitumen.
very informative vid. thanks for sharing!
Metal for me because fire will only mean needing to waterblast and paint assuming a fire proof situation under it. For cladding same again or fibrecement. Rockwool under both and steel supports, not timber. Timber only under the rockwool. Context, adjacent to Northland forest/bush. Only a matter of time before a fire comes through. Insurance doesn't replace irreplaceable personal items...
Great video. As for flat roofs a tpo membrane is better than butynol mostly because at the substrate joints you can double lap the tpo and weld the joints. I agree as a designer and quantity surveyor my preferred metal roof profiles are corrugated or the diamond profiles LT7 and BB900. Not a hurge fan tray roofs or 5 rib myself.
You don’t do that with TPO, or any roof membrane - laps and substrate sheets don’t align anyway. Double lapping? Yeah, not a thing.
@@mrbevan yeah i got no clue. the joins in the ply don't dictate where to lay but i would stay off a join if i could help it