Vapour Barrier

C

cooperphilip

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• 3 Mar 2009

• #1

In my loft I have studded out the wall what divides the two houses. I have insulated with lagging and am going to put a 6 mm vapour barrier then plaster board.

What I need to know is at the top of the wall what meets the roof there is a draft there coming through the felt.

Shall I leave this to let behind the new wall breathe or seal it as its a internal dividing wall ?

 

B

bcsurveyor

• 3 Mar 2009

• #2

is your roof traditionally ventilated or does it have breathable felt?

 

B

bcsurveyor

• 3 Mar 2009

• #3

also, i take it you are converting the loftspace?is that right?

 

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cooperphilip

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• 3 Mar 2009

• #4

Yes I am converting my loft. Is is traditionally ventilated it does not have breathable felt.

 

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bcsurveyor

• 4 Mar 2009

• #5

This draft is more than likely coming from eaves vents, therefore the wall should be fully sealed. Roof ventilation should not be mixed with ventilation to habitable spaces.

 

noseall

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• 4 Mar 2009

• #6

cooperphilip said:

am going to put a 6 mm vapour barrier then plaster board.

Click to expand...

6mm vapour barrier, that's pretty thick?