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Insulation board without membrane
Information, help, tips and advice on cavity walls, ceilings and lofts etc....

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JasonClint
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Insulation board without membrane

by JasonClint » Thu Jan 19, 2023 5:52 pm

I have a 1930s semi with original roof. The roof is dry, but it's just tiles - no membrane.

Is it ok to install 50mm insulation board between the rafters (leaving a 50mm gap between board and tiles) without a membrane?
stoneyboy
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Re: Insulation board without membrane

by stoneyboy » Sat Jan 21, 2023 12:30 am

Hi jasonclint,
Yes that will be ok provided you leave a ventilated air gap under the tiles.
Regards S
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