Penetrating damp occurs when water enters a property through defects in the building's exterior. Unlike rising damp, which originates from the ground, penetrating damp can affect walls and ceilings at any level of a building.
Common causes include damaged brickwork, cracked render, missing roof tiles, leaking gutters, and faulty pointing. When rainwater finds a route into the building fabric, it can create damp patches that gradually worsen over time.
One of the main signs of penetrating damp is the appearance of isolated damp patches on internal walls or ceilings. These patches often become more noticeable after periods of heavy rainfall and may darken when wet.
Additional symptoms include peeling paint, stained plaster, mould growth, and a musty smell. In severe cases, prolonged moisture exposure can lead to timber decay and damage to decorative finishes.
Regular external inspections can help identify defects before they cause significant problems. Checking gutters, roof coverings, brickwork, and seals around windows and doors can reduce the risk of water ingress.
Addressing the source of the problem is essential. Simply redecorating affected areas without fixing the underlying defect is unlikely to provide a lasting solution. Early repairs can help protect both the structure and appearance of a property.
