The most common material used for insulation of the roof is foam. The use of foam in the qualities of insulation does not cause great difficulties. If the roof is made by a gable type, then lay the foam layers between the roof and the supports. The thickness of the foam should be equal to the thickness of the rafters. Then there will be high quality. Foam, in addition to thermal insulation, has excellent properties of soundproofing and waterproofing. Warming with foam is performed in one or two layers. It is very important to make waterproofing technology clearly and give preference to quality materials.