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Damp Patch on Wall – What Causes It?
A damp patch appearing on a wall is one of the most common warning signs of a moisture problem within a property. These patches may appear darker than the surrounding wall surface and may grow larger over time.
Damp patches can develop for several reasons including condensation, water penetrating from outside defects, leaking plumbing or rising moisture from the ground.
Understanding the pattern and location of the damp patch can often provide clues about the underlying cause, but professional investigation is sometimes required to confirm the exact problem.
What Does a Damp Patch on a Wall Look Like?
Damp patches usually appear as darker areas on internal walls. In some cases the wall may feel cold or slightly wet to the touch.
Other signs that may accompany damp patches include flaking paint, bubbling paint finishes, damaged plaster or mould growth.
The appearance of the patch can vary depending on the type of damp affecting the property.
Damp Patches Caused by Condensation
Condensation is one of the most common causes of damp patches inside homes. This occurs when warm indoor air meets colder wall surfaces, causing moisture to form.
Condensation damp patches are often found in bedrooms, bathrooms, kitchens and corners of external walls.
Poor ventilation and high humidity levels can make condensation problems worse.
Damp Patches Caused by Penetrating Damp
Penetrating damp occurs when water enters a property through external building defects. This may include damaged brickwork, cracked render, defective gutters or roof issues.
Damp patches caused by penetrating damp often appear after periods of heavy rain and may worsen during wet weather.
These patches are commonly found on external walls or around window openings.
Damp Patches Caused by Rising Damp
Rising damp occurs when moisture travels upward through masonry from the ground. This typically affects ground floor walls where a damp proof course is missing or has failed.
Signs of rising damp may include tide marks, damaged skirting boards, salt deposits and damp patches forming near the base of walls.
Proper diagnosis is essential before considering any rising damp treatment.
When Should You Get a Damp Survey?
If a damp patch continues to grow, reappear after decorating or begins damaging plaster and timber, it may be time to arrange a professional damp survey.
A damp survey uses specialist equipment to measure moisture levels and determine the true source of damp.
Correct diagnosis ensures the appropriate solution is recommended and prevents unnecessary treatments.
Book a Damp Survey for Damp Patches
If you have noticed damp patches on walls in your home, Dampline provides professional damp surveys across Durham and surrounding areas.
Our surveys identify the exact cause of damp so the correct solution can be recommended.
Book a damp survey today to investigate damp patches and protect your property.