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US 4,248,926 AGranted
Flashing sheet
AssigneeTajima Roofing Co., Ltd.
InventorsEiichi Tajima, Kaname Yamamoto, Takeshi Saito
Life of this patent
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Abstract
An improved flashing sheet suitable for the formation of a flashing seal at a non-flat part having a three dimentional shape is provided. The flashing sheet comprises a base sheet of knitted fabrics having a high expandability in all directions and a modified bitumen layer of a mixture of bitumen and rubbers. This flashing sheet can be easily and directly applied onto the non-flat part of a substrate without any complex procedures and also without causing water leakage problems of the flashing seal.
Claims14
A multi-layer, laminated, flashing sheet, comprising:
- a base layer made of knitted fabric and consisting essentially of synthetic resin fibers, said knitted-fabric base layer having a high stretchability in all directions;
- at least one modified bitumen layer laminated on one surface of said base layer in direct, face-to-face, mutually adhering contact therewith, said modified bitumen layer consisting essentially of a mixture of waterproofing roofing bitumen and rubber, said modified bitumen layer being substantially waterproof and having a high flexibility and stretchability at ambient temperature and below, whereby the flashing sheet is easily stretchable in all directions and is deformable to easily conform to the shapes of non-flat parts of the roof and walls of a building.
Dependencies are inferred from the claim text.