Penetrating damp happens when rainwater enters through an external defect rather than rising from the ground. Cracked render, open pointing, ageing brickwork and faults in gutters, downpipes or roof areas can all allow water to reach internal walls and ceilings. Putney's SW15 housing includes properties of different ages and wall constructions, so the right repair begins by tracing the route of the ingress rather than treating the visible mark alone. On period or solid-wall homes, moisture can be especially apparent internally after prolonged rain, but the cause still needs inspection. Damplast examines the exterior and affected internal surfaces, identifies practical repair work and can seal cracks, protect suitable facades, repair masonry and restore damaged plaster once the water entry point has been addressed.
