Lime based plaster system for damp wall

Hello,

We have had damp wall on the party wall after the neighbour has removed the chimney breasts. We have never had this issue before and noticed this after they had started work.

After recommendations from the surveyor we have had our side of the chimney stack rendered where necessary and chimney pots fitted last year, however despite this the wall remains damp. The neighbour hasn't fixed his side and also has no soakers where our roof and their roof join plus the hips that have been placed there are very poorly rendered with holes showing through on our side of the roof.

The surveyor told to use a lime based plaster system and no chemical injections as they believe water is coming down from the chimney stack.
The house was built in 1929 , and we would like to know what does a lime based plaster system mean, what materials are required and what is involved. We are currently trying to dry out the walls but it's not working.
Please can someone help.

Asked by Po on 2nd Feb 2026
No answers have been submitted yet
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