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This was the cause of the damp in the first place. No gutter to catch rain water causing it to trickle down exterior wall and soak mud. The downpipe is still draining into the mud but its catching all roof water now.

Yes I agree, VCL is under plasterboard and we will have a floor DPM, but I'm turning over woody's suggestion in my head of a poly-barrier against the wall side and I just don't know how it would be a superior choice over the breathable member which is in-situ given the vapour, if not evaporated...

Right, I understand the former concept of vapour moving into the walls and the poly vapour membrane on the warm side underneath the plasterboard helps prevent this, but when you say there's no need to allow it getting out the other side - this is what I can't grasp - if it doesn't escape...

Thanks for that, but I've got a few more questions in response to this: As this is a single leaf construction, aside from the ventilated cavity (which is absent here), wouldn't the vapour still evaporate (cavity or not) as the air will pass through the outer wall? My understand is that so long...

I'm quite confused by this as I've never seen any resource guides I've consulted use a poly-barrier against a brick wall. By fixing in polythene against the wall wouldn't this will prevent the movement of air and trap in air moisture that builds up inbetween the battens? We are fitting a vapour...

How far up the wall? This is part of the mystery, because I cannot see any evidence to suggest that there is moisture creeping in from any break in the DPC laying on the concrete floor, my only explanation is that it's coming from behind some how and trickling down. I will only be able to be...

Waterproof, breathable membrane. Stapled to the battens and pressed against the brick wall. If the water is trickling down at the back and entering where the membrane is going up the wall, the water would still enter the enveloped area as it is doing now with a DPM, that's my concern.

Just to clarify, the DPC IS running up the walls so it's encapsulating the battens. It runs up the walls between 150mm and 200mm and the rest can be seen on the floor, the width of the DPC is about 600mm. The DPM will be seated underneath or above the DPC (and butt up just before the battens...

We didn't put the DPM down first, as we were intending to over lap it with the DPC. Does it make much of a difference? I've also found that the DPM is no were near as hardwearing as the DPC here so as we would've been working and walking all over it across the floor it just would've been worn...

The actual full floor DPM hasn't been put down yet. This black DPM is just for the stud work. I really don't know if the DPM used for the stud work is wide enough to go up the wall as much as 300mm and still adequately sit underneath the battens.

I'm reposting to this thread because I'm at a stage where I'll be plaster boarding, but before I could I noticed some damp on what should be the dry side of the DPM. Very confused. I ran the DPM about 200mm up the wall but it seems as though water is trickling and sitting where the timber sits...

Would doublebaord with plasterboard have the same result?

Are you referring to the gaps between the insulation and timber battens? We are using foam or foil tape to cover those.

There wont be another layer of insulation after this. Just a double layer of plasterboard. We don't have much floor space and adding another layer didnt leave us with much.

We have stud work erected on a detached garage with foil faces insulation between the battens. We started putting up a vapour barrier, but then realised whether it was needed at all. Does the foil face itself act as a VB, therefore not needing another one? I can continue with installing the...

Well heres a potential issue. How do you fit drylining backboxes to double boarded wall. The lugs wont go back far enough to accommodate the two boards ot seems

Good idea. Thanks

Adding noggins is a possibility but a lot more work and insulation will need to be sliced where the new noggins will go. I am also likely going to double plasterboard due to acoustic benefits. I'm wondering whether this may affect the position of the back box or if I should consider the drywall...

No, not yet fitted

Probably not for all sockets. But this is too deep, I can just about squeeze in 35mm box for the normal.sockets. this 48mm wont work with the insulation unfortunately