초록 ▼

An improved method of adhering a waterproofing membrane to an underlayment and substrate is disclosed. A perforated underlayment comprising a tough, fibrous reinforcing base layer or matting impregnated with a bitumen/polymer mixture substantially similar to the bitumen/polymer mixture of the waterp

An improved method of adhering a waterproofing membrane to an underlayment and substrate is disclosed. A perforated underlayment comprising a tough, fibrous reinforcing base layer or matting impregnated with a bitumen/polymer mixture substantially similar to the bitumen/polymer mixture of the waterproofing membrane is placed on a substrate. The exposed underside of the waterproofing membrane is heated until it reaches a softening point. Thereafter, the membrane is unrolled onto the underlayment whereby the membrane and the underlayment are bonded essentially into a single ply. Additionally, when the membrane is unrolled, the bitumen/polymer mixture is sufficiently molten to flow and pass through the openings of the perforations thereby bonding the final waterproofing membrane to the substrate.

대표청구항 ▼

A method of waterproofing a roofing substrate comprising: (a) covering a substrate with a perforated underlayment comprising a reinforcing fibrous material impregnated with a bitumen/polymer mixture, said perforations being about 10 mm to about 150 mm in diameter, and the composite cross-sectioned a

A method of waterproofing a roofing substrate comprising: (a) covering a substrate with a perforated underlayment comprising a reinforcing fibrous material impregnated with a bitumen/polymer mixture, said perforations being about 10 mm to about 150 mm in diameter, and the composite cross-sectioned area of said perforations comprising no greater than about 25% of the total surface area of one side of the underlayment membrane; (b) heating the underside of a waterproofing overlayment membrane which comprises a reinforcing fibrous material impregnated with a substantially similar bitumen/polymer mixture as said bitumen/polymer mixture of said underlayment membrane, said heating being sufficient to cause said bitumen/polymer mixture to exceed its softening point and begin to flow; and (c) covering said underlayment membrane with said overlayment waterproofing membrane soon enough after heating to cause in part said bitumen/polymer mixture of said overlayment to fuse to said bitumen/polymer mixture of said underlayment and in part to allow said bitumen/polymer mixture of said overlayment to pass through said perforations and adhere to said substrate.