Roof comprises an insulation which is located on the rafters and consists of a rigid self-supporting inner layer, a middle heat-insulating middle layer, and a rigid self-supporting outer layer capable of holding nails

摘要

The roof comprises an insulation which is located on the rafters and consists of a rigid self-supporting inner layer (1), a middle heat insulating middle layer (2), and a rigid self-supporting outer layer capable of holding nails.