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Painting & Decorating

Fluffy crumbly damp patches on walls

Anonymous user 09/03/2024 - 3.04 PM

Hi we have recently moved into an old stone farmhouse. There are a few places where there are smallish (palm of hand size at most) patches where the plaster is white/fluffy and crumbling. What type of damp is this and what is best remedy to fix/before painting? Also on utility/office (built onto back of house with exposed stone walls)- there are patches where the stone walls/mortar between are constantly crumbly and feel dampish. Again remedies please. Many thanks

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5 Answers

Anonymous user

This is called penetrating damp. The external mortar joints will need re pointing as soon as possible. Then further work to repair the internal plaster. This should be taken care of as soon as possible it it could be causing further damage to electrical sockets or floor boards and joists. Try to vent the property as much as possible until this is fixed and keep heating on to allow moisture to escape
Answered19 September 2019
13

Ian Redford

No reviews yet

Welwyn Garden City
Sounds like efflorescence scrub with stiff brush ir wire brush rub and wash area use a mild detergent go to a trade decorators shop dulux they will have stuff for it and damo seal whole wall may need check outside walls may need repointing and sealing etc hope this helps put bliw heater in areas iff damp
Answered19 September 2019
0

ADR Property Maintenance

Rating: 5 out of 5
Boston
its most likely penetrating dampness but without looking its impossible to be sure, it could be the pointing the wall, the gutter, roof felt, to name a few your best bet is get an independent damp expert to have a look for the cause & cost good luck Alex
Answered19 September 2019
0

JPH Decorator

Rating: 4.9 out of 5
Manchester
Scrape it back put stabilising solution on and then repaint
Answered25 September 2019
0

Anonymous user

Sounds like penetrating damp repoint stonework then scrape back affected area inside seal using a suitable sealer fill if needed then repaint
Answered25 September 2019
0