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Breather membrane in roof?

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That would work

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Hi, workshop build progressing well (thanks Mike). I am doing the roof with Onduline. As I will have some breather membrane left over was wondering if there is any point using it above the insulation in the roof?
Thank you
Tim
 

That would work

Established Member
Joined
29 Dec 2018
Messages
603
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9
Location
Dartford
It will have an osb ceiling or if another board I'll put a vapour barrier above. 6x2 joists (it's an 8' span), 25mm purlins 150 rock wool bats. Onduline, insect mesh. Flashing down the ends. The pitch is just over 5 degrees. .. I know this is the bare minimum but I'm going to increase the overlap quite a bit.
 
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