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Vapour Control Layers

Ray Dow · 2012-12-04 21:38:18

Hi, I was wondering if anyone could explain why a VCL is always recommended between a concrete flat roof and the roof insulation & never (not in the books i'm studying anyway) between an inner leaf of block work & the wall insulation. Is there not a danger in both cases of moisture laden air passing through to the the cold…

04-12-2012 9:38pm

#1

Ray Dow

Registered Users, Registered Users 2 Posts: 66 ✭✭

Join Date: May 2012

Posts: 39

Hi,

I was wondering if anyone could explain why a VCL is always recommended between a concrete flat roof and the roof insulation & never (not in the books i'm studying anyway) between an inner leaf of block work & the wall insulation.

Is there not a danger in both cases of moisture laden air passing through to the the cold side of the insulation?

Cheers in advance for any help

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