| 摘要 |
This roof-boarding, roof lining or wind bracing board has a substantially water-tight but steam-permeable foil (1) protected on both sides by two non-woven plies (2, 2'), preferably made of polypropylene, and joined to a glass and/or plastic fabric (7) impregnated with bitumen (5). This layer is covered by a plastic fibre non-woven ply (6), preferably of polypropylene. The glass and/or plastic fabric (7) highly increases mechanical strength and the bitumen (5) improves water-tightness, in particular in the area of the fastening points (nails). Owing to the openings between weft threads (3) and warp threads (4) of the glass and/or plastic fabric (7), no steam-tight bitumen layer is obtained. Instead of the glass and/or plastic fabric, a needle felted glass and/or plastic non-woven ply may also be used. |
