Multifoil insulation on solid wall
Information, help, tips and advice on cavity walls, ceilings and lofts etc....

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Det
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Multifoil insulation on solid wall

by Det » Wed Oct 19, 2011 4:25 pm

Multifoil insulation (eg Triiso 10) supposedly has wonderful insulation properties (equivalent to 200mm rockwool or fiberglass) when lining a pitched roof. I am told it is not suitable for insulating an external wall. Why??
It would seem to me that if it is such a wonderful insulator then tacking it to battens on the (external solid) wall and then fixing the plasterboard over the top should be as effective as 200mm rockwool whilst taking up a minimum of space. The multifoil insulation would act as a vapour barrier behind the plasterboard and there would still be a small ventilated gap between insulation and outer wall.

Can anyone through any light on this issue?

welsh brickie
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Re: Multifoil insulation on solid wall

by welsh brickie » Wed Oct 19, 2011 8:37 pm

the multifoil tends to create condensation more than fibreglass insulation.

Det
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Re: Multifoil insulation on solid wall

by Det » Thu Oct 20, 2011 4:44 pm

Surely if it creates condensation then it is not an effective insulation. You only get condensation if the surface is cold.

welsh brickie
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Re: Multifoil insulation on solid wall

by welsh brickie » Fri Oct 21, 2011 6:51 am

thats why you use a breathable membrane on a roof,and with a ventilated soffit board condensation does not occur.
If you use it to line a wall the moisture is trapped and has no way to disperse, causing damp.

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