Patent ID: 7754304

Claim:
A weatherproofing backer for use in window installation in building structures having an exterior wall with a rough opening therethrough, said rough opening with an interior surface for receiving a flanged window unit having a window flange, said wall being a substrate for a weatherproofing membrane and said flanged window unit, said flanged window unit and said weatherproofing membrane having a juncture, said weatherproofing backer comprising, in combination: a self-setting foam web having two surfaces, said foam web having a predetermined recovery rate and being self-setting with a compression set of 20 to 80 percent at 18 psi, said foam web maintaining the cavity between said window unit and said opening therefor compressively filled, said foam web selected from a group consisting of an open cell structure, a closed cell structure, and a structure of open and closed cells; a pressure-activated adhesive layer disposed on one of said two major surfaces, said adhesive layer having sufficient tack to, upon pressure activation, be adapted to durably adhere said weatherproofing backer to said substrate, said weatherproofing backer configured to extend beyond said window flange and engage said weatherproofing membrane to form a sealed bridge between said window flange and said weatherproofing membrane; and, whereby said juncture between said flanged window unit and said weatherproofing membrane is sealed against water and air penetration.