Window flashing assembly

Abstract

A window or door flashing assembly includes a weather resistive barrier that covers a portion of a wall around a rough opening. The barrier may be comprised of adhesive saturated open cell foam or scrim laminated between layers of impervious film A tapered sealing gasket that engages the inner surface of the door or window nailing flange or molding seals exterior air and moisture from the interior of the building. The barrier may extend into the rough opening and integrate with a sill pan.

1 . The window arid door flashing assemblies under flange seal is constructed from compressible closed cell foam formed in varying widths approximate to the width of manufactured window and door nailing flanges;  
     and said under flange seal being tapered in depth across its width.  
   
   
       2 . The under flange seal of  claim 1  tapered surface is scalloped facilitating use of denser foam while maintaining optimal compression.  
   
   
       3 . The tapered under flange seal of  claim 1  is comprised of a series of slanted fins providing several individual barriers inhibiting moisture and air penetration.  
   
   
       4 . The tapered under flange seal of  claim 3  whose fins each have serrated teeth on the outer portion of the fin providing additional individual barriers inhibiting moisture penetration.  
   
   
       5 . The under flange seal of  claim 1  is adhered or bonded to a flashing membrane;  
     and the under flange seal is positioned on the flashing membrane such that when said flashing membrane is shingled around the rough opening the under flange seal is compressed between the windows nailing flange and the buildings sheathing;  
   
   
       6 . The flashing membrane of  claim 5  is adhered or bonded to the flashing membrane in such manner that an inner flashing flap may remain inward from the under flange seal with such inner flap being folded into the window or door rough opening.  
   
   
       7 . The flashing membrane and under flange seal of  claim 5  includes an outer flange sealing flap with adhesive and release liner that is integrally formed or bonded to the flashing membrane in such position that when the release liner is removed and the sealing flap is folded to the flashing membrane the outer sealing flap adhesive extends over the window nailing flange covering and adhering to nailing slots and fasteners.  
   
   
       8 . A flashing membrane consisting of a layered composite made from a film that is laminated to cellular foam or scrim material saturated with a bituminous, butyl, synthetic rubber or acrylic based adhesive;  
     and that is laminated with a forming roller over the adhesive with an additional layer of impervious film such that as the composite is straightened vapor flow creases are formed in the additional film layer.  
   
   
       9 . The flashing membrane of  claim 8  with an adhered or bonded closed cell foam with exposed adhesive and release liner affixed along the length of one edge of the flashing membrane.  
   
   
       10 . The flashing membrane of  claim 8  where the tapered under flange seal of  claim 1  is bonded or adhered to the length of the flashing membrane.  
   
   
       11 . An extruded sill pan base extending the approximate width of the rough opening framing with lateral sill drain channels formed at regular intervals across the width of the base with such lateral sill drain channels formed at incremental depths moving from the inner to outer side of the sill rough opening;  
     and said extruded sill pan base having periodic exterior sloped drain channels;  
     and a sill pan window flange support integrally formed with the extruded sill pan base at an approximate 90 degree angle to the sill pan base that is greater in width than the typical window flange.  
   
   
       12 . The sill pan base of  claim 11  having a lateral nail slot drain channel extending the length of the sill pan base that is positioned such that the window flange nail slots overlay the drain channel.  
   
   
       13 . The sill pan base of  claim 11  having corner interlock grooves along the length of the lower inner side of the sill pan base and the lower inner side of the sill pan window flange support.  
   
   
       14 . A molded sill pan corner oppositely formed for the right side and left side of the window rough opening formed from thin gauge plastic having an L shaped wall panel integrally formed at the inner sides of the L shape with a sill panel and jamb panel that oppose the wall panel at approximately  90  degrees with the sill and jamb panel being similarly joined;  
     and said sill panel having integrally formed sill base interlock teeth shaped such that when pressure is applied said teeth snap into the sill pan base lateral drain channels of  claim 11  forming a water tight seal of the drain channel, said interlock teeth allowing adjustment of sill window frame support at the comers of the window from approximately 1″ to 3″ in length;  
     and said sill panel having an integrally formed exterior sloped jamb gap drain channel that adjoins the interlock teeth and the jamb panel.  
   
   
       15 . The molded sill pan corner of  claim 14  having a sill panel support leg that is an extension of the jamb panel past the intersection of that panel and the sill panel such that the corner is supported on the window or door sill rough framing.  
   
   
       16 . The molded sill pan corner of  claim 14  having a wall panel drain channel extending downward from the sill panel jamb gap drain channel to the lower edge of the L shaped wall panel.  
   
   
       17 . The molded sill pan corner of  claim 14  having sill pan interlock tabs that snap over the molded interlock channel of the sill pan base of  claim 11 .  
   
   
       18 . An L shaped rear sill sealing leg where the longer leg of the L when adhered to the lateral sill drain channels of  claim 11  spans several channels sufficient in width to allow adjustment of the rear seal to adapt to various window frame depths while the shorter L leg provides sufficient height to form a seal to the window frame, such adhesion functions being provided by tube caulk or a pre-applied adhesive with application release liner.  
   
   
       19 . The rear sill sealing leg of  claim 18  further formed by joining or molding two segments together at 90 degrees to form a jamb sealing leg that mates to the lower jamb corner of the flashing membrane positioned in the window rough opening framing, the sill panel of  claim 14  and the rear sill sealing leg of  claim 18  thereby forming a seal at each corner of the sill pan assembly.