Replastering damp wall

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devilindisguise

New Member
Hello everyone

I have a bad damp problem on our party wall. The wall is currently covered in a gypsum plaster. It’s an old 1890s solid brick house. I was advised that in general breathable materials such as lime-based plaster should have been used. One of the damp surveyors has suggested to hack off up to 1m the existing plaster and re-plaster with lime plaster.

My question is: where the two types of plaster meet, will they be able to form a proper bond between them? I know may sound like a silly question but I have no experience in this area.

Another question if you don’t mind is this: say I remove the existing plaster back to the brick. If I were to install a air-gap membrane over the brick would that negate the need for a lime plaster and I could instead just plaster over with gypsum once again?

Thank you for any help and guidance.
 

johniosaif

Private Member
Firstly you'd need a party wall.agreement , 1m high isn't enough in my opinion. I'd hack it all off and let it dry and keep photos of day 1-7 then get an expert in
 

carl-the-plasterer

Well-Known Member
here's jonny j bonding!.jpg
 

Advanceddamp

New Member
Make sure to use a strong high strength waterproof plaster. Your best bet would be to get a damp surveyor in beforehand to give you a correct diagnosis before spending money and time on re-pastering.
 

JessThePlasterer

Queen Jess Elizabeth I
Make sure to use a strong high strength waterproof plaster. Your best bet would be to get a damp surveyor in beforehand to give you a correct diagnosis before spending money and time on re-pastering.
What do you mean by waterproof plaster? I know there’s breathable and s/c but don’t think I’ve heard of waterproof
 
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