Vapour barrier on dry lined wall

[Deansplit]

I'm dry lining a solid brick wall which has suffered from damp. It's been treated as has growths on, but all is now killed and penetrating damp will be cured.

I bought the thick black membrane to use a vapor barrier to stop any risk of damp ingress but I've just seen a thread which says it goes on the warm/inside side of the wall ie. between P/board and insulation. Is this right, I always thought it went on the solid wall first then studs, insulation and P/board on top??

 

[Deluks]

No don't put it behind the insulation. Had you used foil backed plasterboard then you wouldn't need any polythene, it also doesn't need to be that thick about 300mu I seem to remember.
When you say a solid wall do you mean a double thickness (aka 1 brick deep) wall. As it's not common for these to suffer from penetrating damp. The most likely cause would be condensation or a leak somewhere.

 

[Deansplit]

Sorry posted wrong post there!

It's 1 brick thick, yes. But definitely penetrating damp... - http://news.bbc.co.uk/1/hi/northern_ireland/7852535.stm !!!

 

[freddiemercurystwin]

If the wall is wet or damp a few coats of RIW or similar on the inside face of the wall usually does the job. Why post the beeb link?

 

[Deansplit]

Right, so it's studs onto wall, rigid insulation, then membrane then plasterboard? (the plasterboard with insulation stuck to it would mean loosing more of the room so I opted to set the rigid type 'into' the studs)

 

[Deansplit]

Why post the beeb link? icon_confused.gif

What's a beeb link? What's RIW?

 

[freddiemercurystwin]

Sorry posted wrong post there!

It's 1 brick thick, yes. But definitely penetrating damp... - http://news.bbc.co.uk/1/hi/northern_ireland/7852535.stm !!!

 

[freddiemercurystwin]

http://www.toolbank.com/p/EVB90101