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Insulation & airtight membrames

Dugsy · 2010-08-16 14:52:34

I have a sunroom with a vaulted ceiling in my new build onto which I am installing an airtightness membrame. Could anybody clarify for me if there is a ratio/rule governing the thickness/value of insulation which can be applied on the internal (lined plasterboard) habitable side versus the external side of the membrame?

16-08-2010 2:52pm

#1

Dugsy

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I have a sunroom with a vaulted ceiling in my new build onto which I am installing an airtightness membrame.
Could anybody clarify for me if there is a ratio/rule governing the thickness/value of insulation which can be applied on the internal (lined plasterboard) habitable side versus the external side of the membrame?

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#2 16-08-2010 2:59pm

RKQ

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Ideally the insulation should be behind the air tight membrane, that is on the "cold side" of the membrane.

Your designer & BER report should clarify your insulation spec / thickness in this area, prior to construction.

You could contact you membrane manufacturer for advice.

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