Self-adhesive corner flashing member and method for making and using

Abstract

The invention pertains to a self-adhesive corner-shaped flashing member for flashing a corner of a recessed window or other opening in a building and a method for making the member. The invention also pertains to a method for flashing recessed corners of recessed windows and the like.

1 . A method for flashing recessed corners in a building comprising: providing a strip of flashing material comprising an elastic, conformable, flexible water resistant topsheet having an extension of at least about 150% at an applied stress no greater than 10 N/cm, a pressure-sensitive adhesive layer covering one surface of said topsheet having an equivalent extension as the top sheet at an equivalent applied stress; and a release sheet removably attached to said adhesive layer having a cross direction perforation dividing the release sheet into two major portions and a machine direction perforation dividing the release sheet into an edge portion and a bulk portion; removing a triangular portion of said release sheet wherein the triangular portion is in the shape of an isosceles triangle bisected by the cross direction perforation of said release sheet, wherein the triangle has a 90° angle at the intersection of the machine direction perforation and the cross direction perforation and to 45° angles along the edge of said edge portion of said release sheet, thereby exposing a triangular portion of said adhesive layer; folding said flashing material along said cross direction perforation, thereby attaching the exposed adhesive layers on opposite sides of the fold line such that the exposed adhesive layers make continuous contact; folding said flashing material along said cross direction perforation to form a right angle between the top sheet surfaces and folding said flashing material along said machine direction perforation to form a right angle between the top sheet surfaces, thereby forming the corner-shaped flashing member; removing the remaining release sheet from said corner-shaped flashing member to expose the remaining adhesive layer; and attaching said exposed remaining adhesive layer to the recessed corner surfaces, thereby affixing the corner-shaped flashing member in an installation position. 
   
   
       2 . The method of  claim 1  wherein said adhesive is a rubberized asphalt or butyl adhesive. 
   
   
       3 . The method of  claim 1  wherein said topsheet is a continuous film, a woven fabric, a nonwoven, or a laminate thereof. 
   
   
       4 . A flashing member, comprising a unitary self-adhering sheet conformable to a recessed corner in a building opening, wherein fasteners are not required to hold the member within the recessed corner. 
   
   
       5 . The flashing member of  claim 4 , comprising an elastic, conformable, flexible water resistant topsheet and a pressure-sensitive adhesive layer. 
   
   
       6 . The flashing member of  claim 5 , comprising a release layer attached to the pressure sensitive layer on the surface opposite the topsheet.