New Zealand is OBSESSED!! with Metal Roofs
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- Опубліковано 5 чер 2024
- New Zealand is obsessed with metal roofs
During my time in Canada, I helped build a lot of asphalt shingle roofs but when I came back to New Zealand and started a building company I found that 90% of my clients chose metal roofing.
In this video, we'll discuss some of the other roofing options and draw some conclusions about why Kiwis prefer metal roofing.
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
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.
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..
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 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.
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.
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
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.
And one big benefit of the corrugated metal roof is the quality of the rain water is cleaner and the best for drinking water.
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. 🤣🤣
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
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 😉
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
I think the Canterbury earthquakes had a hand in the reduction of concrete tile rooves.
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.
Good video Josh, always enjoy it
If you're thinking of building or re-roofing your house in NZ and installing solar, we love long run metal roofs.
Fascinating video! We moved around a lot in the 80's and lived in various houses in various states of disrepair. The concrete roofed houses we lived in ALWAYS leaked because the owners would not maintain the house - I have vivid memories of having buckets and pots around the house to collect the water and being really embarrassed when friends came over and our house was leaking.
One reason is that metal roofing is considered a light roof which makes it easier and cheaper to design the trusses.
Thanks. That was concise, informative and interesting.
Holy ! if this clips apprear 1 year before , it will greatly help my assignment works! Very informative, thanks for your explaination :D
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.
Love your videos that explain construction methods!
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!
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.
One of those things we have but never think about 😂 loving all this "sudden" kiwi content yt is recommending.
very informative vid. thanks for sharing!
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.
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.
Terrific video. 👏👏👏
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.
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
My grandparents had a full length metal roof for 25 years here in the US. They'd have kept it longer, but a major windstorm tore off the roof. They are extremely durable. I'm not sure why the roof blew off, but it was installed in the 1970's, so perhaps the installation methods have improved?
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
Very interesting. We have a concrete tile roof & I had noticed all new houses have metal ones. We had a repair done recently & luckily we had a few spares as our roofer said they have all been sent up to the North Island. One thing you didn't mention was earthquakes. Here in Canterbury no one wants a heavy roof hence everyone going to metal.
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
Here I thought it was Metal music they were referring to in the headline 😆 that’s probably true as well 🤘🏻
Notice how most or them are light in colour? Keeps the heat out during summer, lower electricity costs. Rain rolls right off it into water tanks or garden beds. Very durable and more secure from burglary. So many benefits.
I've got a long run metal roof in a small town in the Waikato. 1960s build, solid timbers, it survived a big earthquake in the 70s. I recently replaced the original lead-headed nails the roof was built with with screws, and it only cost me NZ$1,800, as far as I'm aware that's all the maintenance the roof has had in the past 60 years.
I find this video echos the trend in Australia. In Western Australia however, concrete tiles have been king for a very long time. Now with colourbond (metal) being popular due to price and ease of construction, I've noticed a decline in other roof types.
Great video.
Great video mate. Re membrane pricing - more like $150-$180m2 depending on product and size/difficulty these days.
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!!
I’d love you to address the acoustic features of all these products.
I love the sound of rain on the roof but I’ve also enjoyed complete acoustic dampening.
Hi Josh, does your business offer re-roofing for existing homes, or are you able to provide recommendations? I want to get our old decramastic tiles replaced, but definitely want a business/person I can trust to help with thus process.
Im an NZ chippie just subbd keep it up mate, nice vid
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
Growing up on the West Coast, Lockwood home with a metal roof. God I miss the sound of the rain on the roof, nothing makes me sleep better.
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.
Question: We will use a box 175 gutter and need to decide whether internal brackets or external ones. Internal will create a seamless look. External might have a technical advantage (more robust and better to clean). What do you think?
we use tin here in aus and i really like them. i think they look great and are really easy to do.
Hi Josh, hats off for your excellent construction videos, can you please make one video for the services connections ,power, water, gas, telecom ,drainage etc. and the process of getting the authority approvals and clearances for the same please .
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!
There are some metal roofs in the UK that I know of that an architect came up with in Bromsgrove, near Birmingham. When there's torrential rain, or especially when it hails, the sound inside the house is deafening, according to one of the homeowners that I spoke to about them.
I bet it would be. At least it won’t crack with hail
Probably because they were installed straight on the joists without dampers. Metal will be a few decibels louder than asphalt or tile, but it can be mitigated within reason if it's installed well. Also depends on the type and guage. Standing seam is superior all the way around, but is more expensive of course.
@@newolde1 Yeah but he's talking about New Zealand. Nothing get's done well in this country. Everything is quick and easy. Next year the company you dealt with is long gone because. Nothing is anyones fault in NZ
@@critical_always well the name fits.. 🤣
That's the best part about it. Growing up in Queensland and hearing the torrential rain on the corrugate roof was great!
Concrete tiles were still used in Auckland into the early 2000s at the least.
I liked installing them much better than metal tiles that would get dented if you looked at them funny and were slippery in the rain.
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 recently done a few jobs with espan cladding for the actual house. It seems that metal materials are starting to become more popular period
Hi Josh, We live in Christchurch , 1950s timber framed house with concrete roof tiles and red brick veneer cladding. We are in the middle of dealing with EQC, engineering report says becase of ground condition the perimeter concret foundation is inadequate to support the load on house. In terms of roof maintenance I have replaced a few concrete tiles over the years but what would you recommend in regard to getting rid of the moss and lichen on tiles and waterproofing the tiles? We cant afford to replace concrete tiles with a long run corrugated roof. Cheers
Less Chance of leaks and adds some strength to the building. During the Abbotsford Slip near Dunedun, some new houses hanging over the slip were held together by the long-run iron.
Kiwi living in Western Australia, almost exclusively here , (I would guess around 80%) builders use terracotta tiles on residential properties. Metal and other types are mostly used on commercial stuff and the more pricy , architecturally designed homes.
Similar in Sydney most are terracotta tiles, but starting to see more variety. I think long run metal is more common in remote areas because they are much lighter to transport so become more cost effective. Also a concern in areas like Sydney with frequent heavy storms is metal is very loud when it rains. We have to close doors when summer storms hit because although we have a terracotta roof, there is a metal roof on the back deck and the noise makes it hard to watch TV or even talk.
good stuff mate. video like this is so good for the industry. keep on learning and teaching !! thanks !
Just a small detail but slate tiles are fixed to battens like concrete tiles no substrate needed. 80% of the roofs I work on here in Cornwall UK are slate, these have 100 year lifespan and can last much longer.
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 feel like another reason why concrete tiles are a thing of the past now is earthquakes.
Here in Christchurch a lot of houses had to have a lot more work done on them because of the damage caused by having a concrete tile roof. A lot of properties had concrete tiles pre-quake and then were retrofitted with metal roofs afterwards.
Be sure to put an insulation blanket under a metal roof to help reduce expansion / contraction noise.
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.
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.
a light roof also requires less bracing in the actual building than a heavy roof...for both wind and earthquake
Traditionally English homes in NZ were clay tile which were never recommended for homes 200km from the coastline as they dont handle the salty erosion.
Concrete tile roofs performed very badly during the Christchurch earthquake. After that they slowly dropped in popularity in NZ
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.
Bro where did you get the video footage from at 2:50 that’s my home town I recognised it straight away😂😂
i love the tray style roofing panels. living on a farm in nz with bush surround our house is safer if there was a fire and we have always collected water in 30000 litre concrete tanks.
What’s the minimum pitch fo metal roofs in New Zealand?
interesting, concrete tiles are still very common in South Australia, and the only alternative that you see is corrugated metal
the big downside of metal though is that it isn't great for our hot summers, so cooling is more expensive. A minor thing is we don't like how loud metal is either. This is why tile is still very common
Corrugated galvanized iron can be as cheep as $10 per metre brand new, I built my 7.5x7.5 5.2m high pole shed for $12k and both walls and roof are iron. Noisy in the rain though
I like our concrete tile as it means it never gets too hot in the attic
Asphalt roofs are flammable. At a certain temperature all the tar turns into a liquid inferno. When a blaze goes through a neighborhood it can just hop roof to roof and burn whole neighborhoods. The fact that is still used in areas prone to forest fires is a serious head scratcher. Unfortunately it is hard to break long standing building patterns.
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.
So many new builds around Auckland are being roofed with asphalt shingle, it will be the next era of leaking buildings. Also architects go crazy with shingle roof designs so they just increase the number of problem areas.
I'm a roofing estimator and I think steel is simply the best choice for NZ. We get crazy heavy rains nowadays and tiles provide too many openings, shingles come unstuck so fast maybe because of our UV idk, membrane is crazy expensive.
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.
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?
Not sure why the algorithm thought I’d like to learn about roofing across the ditch. Strangely though, I did 🙂
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
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...
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.
Thanks for your insightful vid! My 30yr old house has a Colour Steel roof. A year ago i had a roof painter guy check it & his advice was to waterblast the lichen & moss off it & paint it which he did.... ($4000). Then a few months later i ended up having a small leak appear so checked by a roofer i'm told the entire ROOF IS SHOT, he showed me photos after they pulled some sections off the gable to identify the leak zone & the entire gable to flatter deck transition undercovering flashings have completely rusted away ... So i am facing a $30,000 full re-roof. If only the roof painter had said something huh!
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
Me watching this as they finish of our metal roofing here in Aus..
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 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.
gotta be the most common in Australia too.
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.
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
Adding to my suggestion of a "education Channel"
You might call it "Myhomebuild".
It would enable registered members to access all of your elements such as your roofing module.
M
The mandating of ever increasing insulation performance has eliminated a great deal of the earlier and massive noise disadvantage of steel roofs verses concrete tiles during moderate and heavy rain. You haven't touched on the big ventilation requirement differences/consequences (for skillion/flat roofs) between membrane/Asphalt and (some flat pan steel/copper roofing) and other more naturally vented roof claddings.
Downsides of metal roofing? How’s the rain patter?
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.
Perth West Australia here...We use Terracotta tiles on most homes here.... Don't you use them in Nuh Zullund ?
Nah we're not rich like yous
You fullahs too flash for mutul ruufs?