Damp barrier and damp membrane advice help
Damp can be a major issue in the home. Find answers to questions or post your own here.

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Funkyboy
Labourer
Labourer
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Joined: Wed Sep 25, 2019 10:06 am

Damp barrier and damp membrane advice help

by Funkyboy » Wed Jan 18, 2023 5:23 pm

Hi All,

Is anyone familiar with damp proof membrane systems?
My parents have just had this fitted in their home then plaster board dab and dot onto it and skimmed.
There is some cutouts for in the plaster board for service utilities and radiator pipes. In these gaps if you touch the plastic membrane it's wet to the touch same for other areas that you can get your fingers under the plaster board gaps. Is this normal?

Thanks

stoneyboy
Project Manager
Project Manager
Posts: 6446
Joined: Wed Dec 10, 2008 6:44 pm

Re: Damp barrier and damp membrane advice help

by stoneyboy » Thu Jan 19, 2023 10:45 pm

Hi funkyboy,
Where a impervious sheeting (DPM) is applied to a wall it is inevitable that condensation will form in the wall/DPM junction. If applied to a cavity wall, the wall will probably dry out. If applied to a solid wall, especially north facing walls, there is a good chance that so much condensation will be formed that it will run down behind the DPM and appear at the bottom of the wall.
If this happens to your parents you will have to get the contractor back to sort it out.
Regards S

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