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Damp Stains on Walls – What Causes Them?
Damp stains on walls are often a visible sign that moisture is affecting a property. These stains may appear as darker patches, yellow or brown marks, or areas where paint and plaster begin to discolour.
In some cases the stains may gradually grow larger as moisture continues to move through the wall.
Identifying the source of moisture is important before attempting repairs, as damp stains can be caused by several different types of damp problems.
What Do Damp Stains on Walls Look Like?
Damp stains often appear as irregular patches or marks on plaster surfaces. The affected area may appear darker than the surrounding wall and can sometimes feel cold or slightly damp to the touch.
Paint may begin to bubble, peel or discolour in the affected area.
Damp Stains Caused by Condensation
Condensation can create damp staining when moisture repeatedly forms on wall surfaces. Over time this moisture can damage paint finishes and leave visible marks.
Condensation stains are often found on external walls, in corners of rooms and around windows.
Damp Stains Caused by Penetrating Damp
Penetrating damp occurs when water enters the building through defects such as damaged brickwork, leaking gutters or roof problems.
When moisture enters walls from outside, it may create visible damp stains on internal plaster surfaces.
Damp Stains from Rising Damp
Rising damp can create damp stains on lower sections of walls where moisture travels upward from the ground through masonry.
This type of damp may also cause tide marks, salt deposits and damage to skirting boards.
Yellow or Brown Damp Stains on Walls
Damp stains may appear yellow or brown depending on the materials affected and the length of time moisture has been present.
Damp Stains on Internal Walls
Damp stains on internal plaster walls can indicate condensation, hidden leaks or moisture travelling through masonry.
Damp Stains Near Ceilings or Corners
Stains appearing near ceilings or in corners of rooms may indicate roof leaks, plumbing issues or condensation problems.
When Damp Stains Should Be Investigated
If damp stains continue to grow, reappear after decorating or are accompanied by mould or damage to plaster, it may indicate an ongoing moisture problem.
A professional damp survey can identify the source of damp and determine whether condensation, penetrating damp or rising damp is responsible.
Book a Damp Survey for Damp Stains
If you have noticed damp stains on walls in your home, Dampline provides professional damp surveys across Durham and surrounding areas.
Our surveys identify the cause of moisture problems so the correct solution can be recommended.
Book a damp survey today to investigate damp staining and protect your property.