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Advice on installing wood outbuilding roof insulation


AndyW9999

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I have 20mm polystyrene sheet to insulate the interior of the roof (the polystyrene is appropriate to this use, relevant BS EN standards - the 'outbuilding' is my new posh shed not a dwelling of any kind ?

 

The roof (sloping not flat) is constructed of 20mm OSB on wood joists (photo) and covered with heavy duty bituminous felt externally.

I'm thinking of applying the polystyrene direct to the underside of the OSB using a spray adhesive.

Is it ok to do this?...Im wondering if there could be any issues with the OSB being 'sealed' both sides?

 

Thanks

Andy

 

https://photos.app.goo.gl/hR3GJWvXyNuwqsVJ6

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Have you more information on the insulation, sounds very thin..... what are you trying to achieve? How are you going to deal with cold bridges ? What will be your vcl ? Will the shed be heated ? More information required about the project will help people give you good advice. 

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