Remedial DPC and Replacing Old Plaster.

[Meatbag]

Hi All,

I'm about to install a chemical DPC into the internal walls of a Victorian property and was wordering whether, even though there are damp patches on the plasterwork of the walls, do I need to pull of the old plaster and replace with sand-cement waterproofed render, or can I just allow the old plaster to dry off and skim over it later? There does not appear to be any salt deposits on the walls and the plaster is not blown.

Additionally, I've noticed that the mortar course between the bricks of the internal walls are not in the best of conditions (broken in places). Do I still drill the holes for the DPC cream into the mortar, or should I drill into the brick instead?

Lastly, If I do render, can I use a top coat of gypsum based plaster?


Thanks in advance for any advice.

[ultimatehandyman]

Hi and welcome,

Have you read this page-

damp proofing

It seems to answer all your questions