| 摘要 |
The roof frame has a rigid underface, on which is glued an insulation (4) made of plastic cellular foam or synthetic foam, while the rigid underface is cellular fibre reinforced plaster board (7) compressed and moulded. There are two types of box structure, one (A) having three rafters (3) and the other (B) having two rafters, so that a constant rafter spacing can be obtained. After jointing (8), the underface is sanded to give it uniform continuity and uniform fire resistance, and the roof cover tiles are placed on the rafters. |
