| 摘要 |
A construction membrane with a lap portion 18, for overlapping another construction membrane, with a plurality of adhesive regions 12 and nonÂadhesive regions 14 thereon. The adherable regions and nonÂadherable regions may be in the form of a tape and may be covered by a release liner 16. The adhesive may be thermoplastic synthetic rubber or be polyolefin or modified acrylic based and may be UV stabilised and/or heat stabilised. The nonadhesive regions may be regions of silicone. The liner may be waxed paper, polyester or polypropylene and may comprise a silicone layer. The membrane may be constructed of polyolefins and/or be bitumen-based. The membrane may be a roof underlay. A roof or wall may be made from a plurality of membranes adhered together in an overlap region. The nonadhesive regions allow gaps for ventilation; this allows water vapour to escape but resists wind uplift. |
