Insulation between joists

Joined
13 Dec 2007
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Location
Cambridgeshire
Country
United Kingdom
We are about to insulate our loft by attaching foil backed rolls between the joists. we did not put the roof on so how do we know whether the felt is breathable, and therefore whether we need to leave a gap to avoid condensation build up?
 
Foil backed rolls?

If you mean the multi-layered tri-iso type expensive stuff, then check the installation guide. I believe it needs an airgap both sides to work properly.
 

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