Sill pan flashing for doors and windows

Abstract

A flashing system and associated method controls water and air intrusion around the sills of windows, doors, louvers and other wall penetrations. More specifically, a sheet material is creased and folded to form a sill flashing component to control water and air intrusion. Prior to this invention, a separate pre-molded termination accessory was required to effectively seal corner areas around window and door rough openings. The invention provides for sill flashing and supplemental sealing at selected joint locations prior to installation of a closure member in the opening to prevent water and air intrusion around windows, doors and other building openings.

1 . A flashing system for preventing intrusion of water and air through a sill area of an opening in a wall, the flashing system comprising: 
 a sill pan membrane having a top face and a bottom face;    a first portion of the sill pan membrane adapted to be positioned on the sill and an adjacent portion of a jamb of the wall opening;    a second portion of the sill pan membrane adapted to extend rearwardly from the sill and jambs of the wall opening, the second portion being adapted to be formed into a sill rear dam adjacent the sill and jambs of the wall opening;    a first adhesive layer on the bottom face of the first portion of the sill pan membrane; and    a second adhesive layer on the top face of the second portion of the sill pan membrane.    
   
   
       2 . The flashing system of  claim 1  further comprising: 
 a pair of sill end dams each formed by folds in the sill pan membrane, each sill end dam being adapted to be juxtaposed to a juncture of the sill and one jamb of the wall opening.    
   
   
       3 . The flashing system of  claim 1  further comprising: 
 a front downwardly depending flange formed in the sill pan membrane and adapted to be juxtaposed to the wall opening subjacent to the sill and jambs.    
   
   
       4 . The flashing system of  claim 1  further comprising: 
 a pair of gusset folds in the sill pan membrane, each gusset fold being adapted to be positioned proximate a juncture between the sill and one jamb of the wall opening.    
   
   
       5 . The flashing system of  claim 1  wherein the adhesive layers each further comprise a pressure sensitive self adhesive applied generally uniformly and continuously over the respective faces of the associated portions of the sill pan membrane.  
   
   
       6 . The flashing system of  claim 1  wherein the top face of the first portion and the bottom face of the section portion of the sill pan membrane do not have any adhesive thereon.  
   
   
       7 . The flashing system of  claim 1  further comprising: 
 a pair of juncture sealing strips each adapted to be applied at one of the junctures of the sill and one of the jambs and over the sill pan membrane when installed in the wall opening.    
   
   
       8 . The flashing system of  claim 1  further comprising: 
 a pair of termination membranes each adapted to at least partially overlap one another and be applied adjacent the juncture of the sill and one of the jambs over the sill pan membrane when installed in the wall opening, one of the termination membranes being adapted to be applied on the sill of the wall opening and extend forwardly and outwardly therefrom toward the adjacent jamb and the other termination membrane adapted to be applied on the jamb of the wall opening and extend forwardly and downwardly therefrom.    
   
   
       9 . A flashing system for preventing intrusion of water and air through sill area of an opening in a wall, the flashing system comprising: 
 a flexible sill pan membrane having a top face and a bottom face;    a first portion of the sill pan membrane adapted to be positioned on the sill and an adjacent portion of a jamb of the wall opening;    a second portion of the sill pan membrane adapted to extend rearwardly from the sill and jambs of the wall opening, the second portion being adapted to be formed into a sill rear dam adjacent the sill and jambs of the wall opening;    a first adhesive layer on the bottom face of the first portion of the sill pan membrane;    a second adhesive layer on the top face of the second portion of the sill pan membrane;    wherein the adhesive layers each further comprise a pressure sensitive self adhesive applied generally uniformly and continuously over the respective faces of the associated portions of the sill pan membrane;    a pair of sill end dams formed by folds in the sill pan membrane, each sill end dam being adapted to be juxtaposed to a juncture of the sill and one jamb of the wall opening;    a pair of juncture sealing strips each adapted to be applied at one of the junctures of the sill and one of the jambs and over the sill pan membrane when installed in the wall opening;    a front downwardly depending flange formed in the sill pan membrane and adapted to be juxtaposed to the wall opening subjacent to the sill and jambs;    a pair of gusset folds in the second portion fo the sill pan membrane, each gusset fold being adapted to be positioned proximate a juncture between the sill and one jamb of the wall opening; and    a pair of termination membranes each adapted to at least partially overlap one another and be applied adjacent the juncture of the sill and one of the jambs over the sill pan membrane when installed in the wall opening, one of the termination membranes being adapted to be applied on the sill of the wall opening and extend forwardly and outwardly therefrom toward the adjacent jamb and the other termination membrane adapted to be applied on the jamb of the wall opening and extend forwardly and downwardly therefrom.    
   
   
       10 . The flashing system of  claim 9  wherein the top face of the first portion and the bottom face of the section portion of the sill pan membrane do not have any adhesive thereon.  
   
   
       11 . A method of flashing a sill of an opening in a wall comprising the steps of: 
 applying a first portion of a flexible sill pan membrane on the sill of the opening and portions of the jambs adjacent to the sill; and    folding a second portion of the flexible sill pan membrane into a sill rear dam rearwardly from the sill and jamb portions of the wall opening.    
   
   
       12 . The method of  claim 11  wherein the sill rear dam is generally perpendicular to the sill and jamb portions of the wall opening.  
   
   
       13 . The method of  claim 12  further comprising: 
 forming pair of gusset folds in the second portion of the flexible sill pan membrane, each gusset fold being adjacent one of the jambs of the wall opening.    
   
   
       14 . The method of  claim 11  further comprising: 
 adhesively securing the first portion of the flexible sill pan membrane to the sill and jamb portions.    
   
   
       15 . The method of  claim 11  further comprising: 
 applying a juncture sealing strip over at least part of the first portion of the flexible sill pan membrane at a juncture of the sill and one jamb portion of the wall opening, the juncture sealing strip extending angularly downwardly from the juncture.    
   
   
       16 . The method of  claim 15  further comprising: 
 applying a first termination membrane over part of the first portion of the flexible sill pan membrane and a part of the juncture sealing strip, the first termination membrane extending angularly downwardly from the juncture.    
   
   
       17 . The method of  claim 16  further comprising: 
 applying a second termination membrane over one of the jamb portions and portions of the juncture sealing strip and the first termination membrane.    
   
   
       18 . The method of  claim 11  further comprising: 
 inserting a frame into the wall opening atop the sill; and    tacking the sill rear dam to the frame.    
   
   
       19 . The method of  claim 11  further comprising: 
 peeling a first protective strip from a bottom face of the first portion of the flexible sill pan membrane to expose a first adhesive layer adapted to secure the first portion to the sill and jamb portions.    
   
   
       20 . The method of  claim 19  further comprising: 
 peeling a second protective strip from a top face of the second portion of the flexible sill pan membrane to expose a second adhesive layer adapted to secure the second portion into a configuration of the rear dam.