Plasterboard for previous contaminated plaster

[Bob]

I have a wall that was damp and caused contaminated plaster (i.e salts)

Traditionally, the reccomended solution is to replaster (using Thistle Driwall). However I can considering replacing with plasterboard?

What type of plasterboard should I be using? I have googled and found mention of "damp proof" plasterboard, but when looking at the travis perkins website, the range become confusing? Is Gyproc Moisture Resistant the stuff? or should I be using something else? (i.e plaster with driwall, or other plasterboard?)

[Ian Stirling]

Moisture resistant plasterboard is moisture resistant, it will not stand constant damp.

If you have constant damp, you need to fix it.

[Bob]

The wall WAS damp, this has been fixed (bridged DPC). Can regular plasterboard be used?? I understood if the wall was plastered (i.e not plasterboard) then regular plaster could not be used on previously contaminated areas and that driwall or similar needed be to used.

[Ian Stirling]

The issue is that with plaster, salt and stuff can still leach a bit at normal humidities over time.

With plasterboard, as long as there is an airspace behind it, you are fine, as nothing can leach to the plasterboad.

[meow2222]

However walls are very slow to dry out. If you use distemper rather than emulsion you'll keep the pb/paint barrier porous, which will aid in drying out.

OTOH if youre PBing you might want to add battens and rockwool, which will need a vapour barrier.

Best option is probably remove plaster, let dry a month, add insulation and pb, if you dont already have cavity insulation.

NT

[The Natural Philosopher]

If its been fixed you simply wait for the plaster to dry out, PVA it and paint it.

Or use anything including foil backed board if you must, to cover it.

[The Natural Philosopher]

Yeah Might take as long as a week indoors this time of year with CH on..

[meow2222]

for the surface maybe, but most walls arent paper thin. Allow about 3 weeks per inch IIRC. If youre plastering before then, porous lets it keep drying.

NT