Ceiling/roof insulation

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TCH
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Re: Ceiling/roof insulation

Post by TCH »

Not trying to promote my business just trying to be helpful that's all he didn't want to buy a house. I posted the same type of reply regarding a post about double glazing and that wasn't taken down so I am not sure what your policy is, please clarify.
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Re: Ceiling/roof insulation

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Re: Double glazing in Thailand
Post by TCH » Tue May 07, 2019 10:55 am

The UPVC double glazing windows and doors make an enormous difference to reduce the indoor temperature and outside noise reduction, this coupled with Qcon blocks and 3 inch over ceiling insulation makes huge electric savings as it keeps air con usage to a minimum. So in our opinion double glazing is definitely worth considering.
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Re: Ceiling/roof insulation

Post by buksida »

TCH wrote: Wed Nov 06, 2019 2:26 pm Not trying to promote my business just trying to be helpful that's all he didn't want to buy a house. I posted the same type of reply regarding a post about double glazing and that wasn't taken down so I am not sure what your policy is, please clarify.
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Roof spray foam insulation

Post by PeteC »

hhinner wrote: Fri May 28, 2021 7:41 pm And one with a bucket under a leaky roof?
Above taken from the "Weather" thread.

If having that problem the spray insulation foam on the underside of the roof will stop any leaks dead, as well as make it impossible for anyone to break in through the roof without using a sledge hammer. I'm on year 8 now and not a drip. Before that we would have problems with every hard storm.

These clay or cement tiles shift around daily depending upon sun/heat/cooling etc. They can't help but leak. My house is 2007 vintage and perhaps now with new-build they are using a more advanced tile. I would hope so. :cheers:
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Re: Roof spray foam insulation

Post by Robinhood »

Are barrier materials used in Thailand? Tar Felt was popular in the UK many decades ago and maybe Tyvek more recently? For retrofit, a spray could be practical, I'm interested in how buildings are waterproofed in Thailand so any details of interest.
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Re: Roof spray foam insulation

Post by pharvey »

Robinhood wrote: Fri May 28, 2021 9:52 pm Are barrier materials used in Thailand? Tar Felt was popular in the UK many decades ago and maybe Tyvek more recently? For retrofit, a spray could be practical, I'm interested in how buildings are waterproofed in Thailand so any details of interest.
Perhaps a different material here in the UK, but for one reason or another, I've been advised against using the "Spray Foam". In the UK, it's purely insulation and energy "savings" - nothing to do with "waterproofing". Whether that is a factor in the material, I don't know.

We had issues with our place in HH a few years after it was built, but this was repaired (simply) and no issues since (+/- 12 years). I believe it was corrected simply by locking several individual tiles in place to reduce/minimise contraction/expansion as mentioned in Pete's post, but stand to be corrected.

:cheers: :cheers:
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Re: Roof spray foam insulation

Post by HHTel »

I had a roof leak fixed with foam some years ago. Has stood up to the weather since. There are a number of contractors who will 'foam' the underside of your roof. Not sure how widespread it is.
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Re: Roof spray foam insulation

Post by PeteC »

The spray foam used here is most definitely for waterproofing as well as insulation. It's heavily advertised as such.

I don't know how they build houses here these day but in 2007 our roof is nothing but steel beams crossed laced with I think are aluminum stringers with the concrete, glazed tiles placed on top of it all. The only type of "insulation", which it really wasn't, was aluminum foil type material covering up the beams and stringers. Really useless concerning insulation or water leaks. In fact, it actually hid the place where the tile had moved and where the water was coming in. Of course where the water comes in is never where it eventually comes out as it runs along everything. In some cases the roof tile problem was found 3 meters from where the leak manifested itself as drips on the interior plaster board ceilings in the upstairs. :banghead:
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Re: Ceiling/roof insulation

Post by Dannie Boy »

We had a house built about 18 months ago and had spray foam applied primarily for insulation purposes, so for “free” we also get waterproofing and a degree of sound insulation, both tangible benefits in Thailand.
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Re: Ceiling/roof insulation

Post by nikkointhai »

I am now looking at various ways for house cooling/ventilation. This what I come up with so far

Doors/Windows - replacing the old rubbish aluminium type for new good quality uPVC. As I have replaced a number of these already, it definitely made a difference.

Roof - I'm not a fan of the spray foam stuff. Ideally should have the heat reflective sheet (aka sarking) under tiles. But because my house is already built years ago they never used it. I'm thinking to go with the fibreglass roll, such as SCG Stay Cool. Anybody here used that?
Also I see a lot of houses around have those metal "whirlybird" passive fans - how effective are those?

Walls - again if I was starting from new, would have double skin qcon blocks. But my house only has single skin blocks between the concrete pillars. So I'm thinking to put insulation inside, then dry line with metal stud/plasterboard. Can use XPS foam sheet or Rockwool slabs for that. Both quite expensive though. Again, if anyone has tried this already, advice most appreciated, thanks.
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Ceiling/roof insulation

Post by Dannie Boy »

Let me give an update on the house we have, which has the foam insulation sprayed on the underside of the roof.

First, it definitely does reduce the inside temperature by a few degrees- it’s most noticeable when you’ve been out, had the house locked up and return home - in our old home the heat would hit you when you opened the door - here it doesn’t hit you hardly at all. As well as the foam insulation, we also have pvc double glazed windows and double thickness (about 18 cm from memory) thermal block walls.

Now the downsides.

The company who did the roof (some 4+ years ago so no warranty) missed a number of small areas, and lo and behold, when it rains the rain finds the holes!! Another issue is that the foam sets like concrete and shrinks slightly in the process, putting pressure on the roof tiles and in some areas cracks. We had a guy up in the roof space last week trying to plug all the “holes” using tins of foam spray - waiting for rain to see whether it has been successful or not


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Re: Ceiling/roof insulation

Post by Khundon1975 »

We have the spray foam insulation in our place and the difference
in retaining the cooled air inside is extremely noticeable.

Someone mentioned about using this type of insulation in the UK.
Mortgage companies are dead against using it and most won’t give a mortgage on properties that have it installed under the roof, mainly because it encapsulates the roof timbers, which then sweat and start to rot and the owners don’t have a clue that it’s happening.
Many homeowners who have had it installed and who have tried to sell their homes have had to have it removed at a huge price.
I've lost my mind and I am making no effort to find it.
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Re: Ceiling/roof insulation

Post by dundrillin »

nikkointhai wrote: Mon Apr 01, 2024 1:00 pm I am now looking at various ways for house cooling/ventilation. This what I come up with so far

Doors/Windows - replacing the old rubbish aluminium type for new good quality uPVC. As I have replaced a number of these already, it definitely made a difference.

Roof - I'm not a fan of the spray foam stuff. Ideally should have the heat reflective sheet (aka sarking) under tiles. But because my house is already built years ago they never used it. I'm thinking to go with the fibreglass roll, such as SCG Stay Cool. Anybody here used that?
Also I see a lot of houses around have those metal "whirlybird" passive fans - how effective are those?

Walls - again if I was starting from new, would have double skin qcon blocks. But my house only has single skin blocks between the concrete pillars. So I'm thinking to put insulation inside, then dry line with metal stud/plasterboard. Can use XPS foam sheet or Rockwool slabs for that. Both quite expensive though. Again, if anyone has tried this already, advice most appreciated, thanks.
QCon don't recommend double ski blocks as they tend to crack instead they recommend 20cm single block. Incidentally the QCon company will send 2 technicians to talk to you're builders/architect and give advice for free. I took them up on this and was very impressed.
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Re: Ceiling/roof insulation

Post by fft100 »

We used 20cm qcon blocks all over the house. Both inside and outside walls. The difference in heat on the balconies of one side of the wall in direct sunlight compared to the other side in perpetual shade was enormous. I think the extra for 20cm is worth it. They are also load bearing which thinner blocks aren't, and have a certain amount of sound proofing.

We also put 6 inches. (150mm) Of SCG roof insulation across the ceiling boards for the whole house.. With LED lights no heat issues. Again, big difference in the amount of Aircon needed, and it kept a consistent temperature in the whole room. If you ever go into the roof space during the day, you may be very surprised how hot it is. Roasting.

Effectively,.we did what.you would do in Europe, but this time to keep the heat out and the cold inside !
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Re: Ceiling/roof insulation

Post by nikkointhai »

Thanks for all the great advice, really helpful
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