Guide
Painting a damp wall
What to do before painting a damp wall, and why a coating alone does not solve water ingress.
Answer
What should I do before painting a damp wall?
Explanation
Why this matters commercially as well as technically
Paint applied over an unresolved moisture source generally fails again, often within months. The money spent on product and labour is lost, and moisture can be trapped in the wall in the meantime.
Detail
Common sources worth checking
Roof and terrace waterproofing, plumbing within or behind the wall, external ground level and drainage, failed sealant around openings, and cracks allowing driving rain through. Which applies is a building question rather than a paint one.
Detail
What a coating can and cannot do
A surface waterproof coating resists water at the surface. A sealant closes a defined joint. A crack treatment addresses a defined crack. None of them repairs a source of ingress elsewhere in the structure.
Detail
What to send us
Photographs of the affected area, whether it is interior or exterior, whether the patch changes with rain, and whether the source is known. That is enough to discuss products sensibly — and to say honestly where a product is not the answer.
Questions
Also asked
Can waterproof paint fix rising damp?
No. Rising damp is a building issue requiring investigation and appropriate remedial work. A coating applied over it does not address the cause.
The patch only appears when it rains. What does that suggest?
It points toward water entering from outside — roof, terrace, an opening or a crack. Worth investigating before selecting any product.
Next
Ready to plan it?
Measure the walls, estimate each layer and build a paint list to send as one structured requirement.