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Insulating Wooden Shed with DPM already installed between Frames and Cladding

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Postby julian46 » Fri Apr 22, 2016 6:11 pm

I would like to insulate the sides of a shed which was built with a damp proof membrane (not breatheable) between the T & G cladding and the 3 x 2 frames. This ensures watertightness but, if I add insulation and then put another DPM on the inside, then any moisture would have nowhere to go.

Is there a solution to this problem? Should I make small perforations in the waterproof membrane to allow evaporation?

Any suggestions gratefully received.

Julian
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Showing waterproof membrane installed before cladding was attached.
DSCN0863.jpg (28.55 KiB) Viewed 2745 times
julian46
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Postby welsh brickie » Sat Apr 23, 2016 6:37 pm

rip it off and use a breathable membrane like Tyvek, it will rot otherwise
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