| 摘要 |
Improved flexible waterproofing membranes of the pre-formed pressure-sensitive or self-adhesive bituminous type particularly useful in roofing are described. The membranes are in the form of factory-manufactured, flexible, sheet-like laminates employing a comparatively thin layer of metal film or foil positioned (a) beneath a support layer of synthetic polymer film and (b) above a layer of waterproofing self-adhesive bituminous composition such as rubberized asphalt. The metal film imparts a number of desired properties to the laminate such as fire-resistance, handling, etc. The upper polymeric support film protects the metal film and provides, inter alia, strength, puncture-resistance, and additional waterproofing properties. In one preferred embodiment, the upper polymeric film layer is a film having good weatherability characteristics. The upper polymer film may also desirably be a film having a higher linear thermal expansion coefficient than the underlying metal film layer in order that the edges of the applied laminate when exposed to e.g. solar heating and subsequent cooling turn downwards towards the substrate to be waterproofed resulting in improved sealability. Additionally, further layers of e.g. protective films and coatings may be applied to the laminates.
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