Damp proof specialists investigate moisture problems in homes and other buildings, identify likely causes and recommend suitable remedial work. They may assess signs such as damp patches, staining, peeling finishes, mould, musty smells or damaged plaster, and consider factors including leaking pipes, rainwater ingress, poor ventilation, condensation and moisture rising through walls. Some provide inspections and written reports, while others focus mainly on carrying out repairs. Depending on the cause and construction of the building, services may include repairing external pointing or drainage, improving ventilation, treating mould, fitting damp-proof courses or membranes, and applying waterproof coatings or tanking to walls and floors. Work can also involve removing damaged plaster, drying affected areas and replastering.