Vapour barrier or not?

[philgro64]

Hi.

Renovating old cottage with 2' stone walls, cement rendering. Joiner has timber framed the internal walls with 3x2 cls and 50mm celotex has been placed within. Aluminium tape will be used to seal any gaps in frame.There is an air gap between rear of cls and walls. A friend who is a keen diyer has suggested that I will need a vapour barrier at rear of timber framing. Is this necessary. Not a disaster if needed but thought joiner would have suggested it before putting timber frame up. Thanks in advance for any advice.

Phil

 

[theprinceofdarkness]

No, no, no, going from the inside to the outside, the layers in a wall should be more and more breathable. This is to insure that any moisture /condensation that occurs in the wall can evaporate outwards. The VCL should be places as close to the inside as possible, i.e. under the plasterboard.
Frank

 

[philgro64]

Thanks Frank, was worried about the effect of moisture on the wooden frame though?

Phil

 

[theprinceofdarkness]

The battens should be tanalised so should be OK. I have a Yorkshire limestone cottage and suffer the with same problems. Have to go now back later!
Frank

 

[philgro64]

Thanks Frank