DIY Doctor

Gap under insulated plasterboard and escaping heat?

Postby AzK » Fri Jan 15, 2021 5:55 pm

Hi

I have bought a couple of insulated plasterboards (Knauf XPS Laminate Plus Insulated Plasterboard Tapered Edge) to go on a ground floor external wall that is cold and it cant be insulated externally.

I understand that on ground floors, you need to leave a 10-15mm gap between the bottom of plasterboard and the floor to avoid any damp or moisture rising up through the board.

My question is as I am trying to insulate a cold wall, do I just leave this gap of approx 10mm x 27mm hollow? I am worried about both heat escaping and also coldness coming through this gap.

I have seen in some places that people suggest using skirting board - whilst this visually covers the gap it doesnt quite deal with the issue of insulating that area.

Any reccomendations or suggestions? Is there a foam or other product I can use to fill to both fill the gap and that is moisture resistant?

Thanks
AzK
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Postby stoneyboy » Sat Jan 16, 2021 4:37 pm

Hi azk
Probably the easiest solution is to use expanding foam which can be trimmed flush to the wall once set.
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Postby AzK » Sun Jan 17, 2021 12:04 am

I think expanding foam might have a similar issue to having the board level with the floor in that is may absorb or attract moisture which may work its way up the board and insulation
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Postby stoneyboy » Sun Jan 17, 2021 11:47 pm

Hi ask
If you are concerned about water permability use a B2 foam.
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Postby stoneyboy » Sun Jan 17, 2021 11:48 pm

Hi ask
If you are concerned about water permeability use a B2 foam.
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Postby B4Less » Mon Jan 18, 2021 12:25 pm

Hi, did you try any PIR boards?
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Postby B4Less » Mon Jan 18, 2021 12:25 pm

Hi, did you try any PIR boards?
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