Damp Under Window – What Causes It?
Damp appearing beneath windows is a common issue in many homes. Homeowners often notice damp patches forming on the wall below the window sill or around the surrounding plaster.
These damp areas may appear as darker patches, peeling paint or mould growth.
Although condensation is often responsible, damp beneath windows may also indicate issues such as leaking window seals, poor insulation or penetrating damp affecting the wall.
Damp Under Windows Caused by Condensation
Windows are one of the coldest surfaces within a property. When warm indoor air containing moisture contacts the glass or surrounding wall surfaces, condensation can form.
Over time, repeated condensation can create damp patches on the wall below the window.
Damp Caused by Leaking Window Seals
Damaged seals around windows can allow rainwater to enter the wall structure. This moisture may appear as damp patches or staining beneath the window.
External defects such as cracked render or poorly sealed frames may also contribute to water penetration.
Damp Under Windows from Penetrating Damp
Penetrating damp can occur when water enters the wall through damaged brickwork, faulty pointing or exterior defects near window openings.
Moisture travelling through masonry may appear internally as damp patches beneath the window area.
Damp Patch Under Window
A damp patch forming below a window may appear as discoloured plaster, peeling paint or mould growth.
Mould Under Windows
Condensation forming around windows can create ideal conditions for mould growth beneath the sill or surrounding wall surfaces.
Peeling Paint Below Window Sill
Moisture affecting plaster beneath windows can cause paint to peel or bubble due to damp conditions behind the surface.
When Damp Under Windows Should Be Investigated
If damp patches beneath windows continue to return or increase in size, it may indicate a moisture problem within the wall.
A professional damp survey can help identify whether condensation, leaking windows or penetrating damp is responsible.
Book a Damp Survey for Damp Under Windows
If you have noticed damp patches forming beneath windows in your property, 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 affecting walls around your windows.