Insulation businesses help reduce heat loss, improve comfort and manage sound or temperature transfer in buildings. They may assess a property's existing insulation and recommend suitable materials and installation methods, taking account of the building's construction, ventilation and intended use. Work can be carried out in homes, commercial premises and other buildings, either during construction or as a retrofit. Typical services include installing insulation in lofts and roofs, cavity walls, solid walls, floors and suspended floors, as well as insulating pipes, tanks and heating systems. Materials may include mineral wool, rigid boards, blown-in insulation and natural-fibre products. Some businesses also supply insulation materials, provide acoustic insulation or draught-proofing, and remove or replace damaged or unsuitable insulation. The scope of work varies: access, moisture, ventilation and fire-safety considerations can affect which solution is appropriate.