DIY damp proofing job using membrane
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DIY damp proofing job using membrane

Post by Radge70 » Thu Dec 10, 2020 9:56 pm

Having never done any meaningful DIY in my life I have decided to try to do a damp proofing job by copying the job spec I was given in a quote I got from a nationwide damp proofing firm. The job is to strip back the plaster on a 5sqm wall to the bare sandstone (which has a cavity behind it and then the main outside wall, which is also sandstone).

There is currently a bad leak from the roof that is coming inside the cavity and soaking the wall – it’s getting fixed as I write this though.

I’ve listed the steps I’m going to use below and am looking for opinions on whether I’m doing things correctly or whether I’m setting myself up for a DIY disaster!

Step 1 – strip wall back to sandstone (already done – see below)
a_resized_20201210_094558469 - Copy.jpg

Step 2 - get roof fixed so that leak that’s coming down the cavity stops (in progress)
Step 3 – after roof is fixed, allow sandstone wall to dry for 3 weeks or so with the aid of a dehumidifier. Check moisture levels using the Protimeter Surveymaster I was talked into buying!
Step 4 – Once dry enough, switch dehumidifyer off and render sandstone wall with PermaSEAL Renovating Plaster to create a flat surface. Allow a couple of days to cure.
Step 4 – fit PermaSEAL 3 Damp Proof Membrane Kit 10m² to the rendered wall
Step 5 – use PermaSEAL Fleece Overstrip to join the membrane where necessary
Step 6 – dot dab plasterboard that has a “Vapourshield” (laminated with a metallised polyester foil) to the membrane
Step 7 – could do with some advice here on how to fill / tape any gaps in the plasterboard. E.g. what products should I use?
Step 8 – paint the plasterboard at some point. I think I read somewhere that it’s a good idea to leave it for a year so that the wall behind it can properly dry out.

Is there anything else I need to consider?
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Joined: Mon Dec 01, 2008 7:26 am

Re: DIY damp proofing job using membrane

Post by collectors » Thu Dec 17, 2020 10:28 am

Why are you damp proofing the wall. Is it not possible that when the gutter is fixed it will dry out & be OK?

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Joined: Sat Apr 23, 2022 1:24 pm

Re: DIY damp proofing job using membrane

Post by isaacyorkshire » Sat Apr 23, 2022 1:27 pm

Did you manage to get this completed? I am about to start my home renovation project and would love to know how yous went?

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