Ceiling/roof insulation

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brianhuahin
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Ceiling/roof insulation

Post by brianhuahin » Mon Jan 18, 2010 2:24 pm

Anybody know where I can source insulating blanket rolls suitable to place above a suspended ceiling.

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Post by splitlid » Mon Jan 18, 2010 2:29 pm

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Post by Khundon1975 » Mon Jan 18, 2010 6:18 pm

brianhuahin :idea:

Have you considered having the spray foam type of insulation that is applied to the underside of the roof? It can be done in a day.
Unless you have a very strong suspended ceiling you will have a difficult job laying those rolls of insulation.


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Post by fft100 » Mon Jan 18, 2010 6:42 pm

if the intention is to make the rooms underneath cooler, then in my experience, the foam that goes underneath the tiles doesnt work. The roof space gets incredibly warm. It is good at retaining heat, but that probably isnt what you are looking for over here !

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Post by Khundon1975 » Mon Jan 18, 2010 6:48 pm

I think the intention of the foam is to stop the roof space getting hot in the first place.

The other type (fibre) does not reduce the heat in the roof space. If the room is warm then the heat will be trapped in by the fibre insulation above the ceiling surely?



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Post by kendo » Mon Jan 18, 2010 6:58 pm

When we built our house we had this silver heat reflecting foil stuff put under the tiles[img]http://www.huahinafterdark.com/for ... :cheers:
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Post by fft100 » Mon Jan 18, 2010 7:16 pm

khundon,

the main point of the foam is to provide a really solid tile base. In the Uk, you will get a 10 year guarantee for replacement of any roof tiles or slates that become dislodged.

It cant keep the roof space cool, as where does the heat in the roof space go to.... ? the heat just builds up and only disapates very slowly. I had it done to a victorian pad in london with large slates 20 years ago. excellent for holding the roof together, but you could have put buckets of water up there and opened a sauna.

AFAIK, to stop heat entering the house, you have to put the insulation just above the rooms (i.e. on the joists, rsj's, whatever you have that hold the ceiling boards up.) then the roof space can get hot (or cold) and the rooms stay a constantish temperature.

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Post by Khundon1975 » Mon Jan 18, 2010 7:17 pm

Kendo :thumb:

That Foil is ideal for stopping the heat getting in, but not to easy to retro fit whereas the spray foam is. I have also read on a forum about people putting in extraction fan systems in the roof space to get rid of the hot air.

Thinking about it, the OP may have been trying to keep cold (air con) air in the room. If that is the case, then fibre would do the trick, but I would not want to have to fit it on a light weight suspended ceiling. I would be bound to fall through.:oops:

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Post by Jaime » Mon Jan 18, 2010 8:07 pm

The point of sprayed foam in Thailand is indeed to insulate the roof from passive heat gains from the outside, in addition to sealing the roof. At least this is how I have seen it marketed and the principle seems sound enough. Ventilating the roof space will help dissipate heat that has risen into it from rooms below during the daytime.

The idea is to reduce the load on the air conditioning, which is trying to cool the house. Laying insulation across the ceiling will have the same (maybe better) effect but won't seal the roof and if you have a typically leaky Thai roof it will get wet.

I suppose for a belt and braces retro fit you'd do both!

The performance and physics of such a construction will be different in temperate London and tropical Thailand - very crudely, the principles are effectively reversed.
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Post by Nereus » Mon Jan 18, 2010 8:53 pm

That is correct, Jaimie. The foam is intended to block radiated heat by the fact that it consists of a multitude of "cells", similar to the fibre type of insulation. And I would also agree with your comment about water leakage and Thai roofs.

With any form of building insulation it is necessary to examine the "R" value of the product. Some types of foam have a much higher "R" value than fibre insulation, but this advantage can be offset by the cost of installation, and the sealing / water problem mentioned.

The OP has mentioned a "suspended" ceiling, but there my be some confusion over just what he means. Thai methods of building will see gypsum / plaster board ceiling "suspended", and is not a problem to lay fibre type insulation over it. Most of the fibre type available here has an aluminium film on one side of it, which increases it`s "R" value without increasing the thickness of the blanket. What I have done in the past is to install a double layer of thinner material, preferably with one layer laid at right angles to the other.

There is a company in Pattaya that installs the spray type. but they will not come just for one house. That may have changed as it is a couple of years since I last enquired.

With either type it is good practice to have some form of ventilation in the roof space to allow cool night air into it.
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Post by nevets » Mon Jan 18, 2010 11:00 pm

The spray company type is in the Observer. e.mail:SprayMePurfoam@gmail.com
0871399900......038413069

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Post by brianhuahin » Tue Jan 19, 2010 9:03 am

The information and discussion have been invaluable; Thanks a lot. Brian

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Post by Rob W » Tue Jan 19, 2010 4:39 pm

I have had the spray foam done and it definatly works in keeping the insside temps down with the added bonus of holding the tiles inplace and hopefully stopping the small leaks due to driving rain.
I would however make sure you are at the house and watch them do the job, they did damage some of my plumbing which i had to call the solar company back to repair at my cost.
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Post by prcscct » Tue Jan 19, 2010 4:47 pm

How do they get the foam hose in there for a house that's already constructed and occupied? I assume a 2 story house would be difficult with access through the small hatch in one of the bathroom ceilings.

In advertisements I've only seen them doing houses under construction by setting up scaffolding inside. Pete :cheers:
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Post by chopsticks » Tue Jan 19, 2010 6:12 pm

If there's no hatch or it's too small to allow someone to enter the roofspace then some of the ceiling/gypsum board has to be broken away and patched up later. The only other option being to remove some roof tiles which rather defeats the object :shock:

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