B - Operations – Transporting – 32 – B
Patent
B - Operations, Transporting
32
B
154/108
B32B 11/00 (2006.01) B32B 11/04 (2006.01) B32B 11/06 (2006.01) E04D 5/10 (2006.01) E04D 5/12 (2006.01)
Patent
CA 1169749
Abstract of the Disclosure 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) a lower layer of waterproofing self-adhesive bituminous composition such as rubberized asphalt non-removably adhered to (b) an upper support layer comprised of a laminate of separate, pre-formed flexible sheet materials having different coefficients of linear thermal expansion. The uppermost sheet material in the support layer (b) has the higher linear thermal expansion coefficient in order that the edges of the applied laminate when exposed to, e.g., solar heating and subsequent cooling, turn downward 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.
379754
Smart & Biggar
W.r. Grace & Co.,-Conn.
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