Structural barrier system

Abstract

An environmental barrier composition and method of use for forming a structural barrier system to seal structural openings such as doors and windows is provided. The composition includes a liquid rosin that is silyl-terminated polyether, a filler material, and a curing catalyst. The method includes applying the composition to a prepared through-hole in combination with flashing material at least along a bottom surface of the through-hole and installation of a window or door into the prepared through-hole to form a barrier system in which a continuous film can be easily inspected, is waterproof, meet air barrier requirements of ASTM E2178, has elastomeric properties, allows substrate expansion, contraction, and movement, does not shrink or lose volume as it cures, and cures rapidly with sufficient adhesion to transition flashing to incorporate into a designed drainage plane and allow integration of a continuous air barrier system where the barrier is at least semi-vapor-permeable.

1 . A structural barrier system, comprising:
 a liquid-applied flashing membrane applied to a through-hole formed in a structural member, the liquid-applied flashing membrane comprising a liquid rosin, a filler material, and a curing catalyst, wherein the liquid rosin is a silyl-terminated polyether;   a sheet of flashing applied partially over the membrane and to a bottom surface of the through-hole and to extend horizontally on each side of the through-hole on exterior sheathing; and   a window or door unit applied to the through-hole over the flashing and the cured liquid-applied flashing membrane.   
     
     
         2 . The system of  claim 1  wherein the liquid-applied flashing membrane is approximately 12 mil thickness. 
     
     
         3 . The system of  claim 2  wherein the liquid-applied flashing membrane comprises a red iron oxide pigment of sufficient amount to make the liquid-applied flashing material transparent until approximately 12 mil thickness after which it becomes opaque, regardless of its cured or uncured state. 
     
     
         4 . The system of  claim 1  wherein the liquid applied flashing membrane comprises a filler material and a liquid resin that forms a cross-linked elastomer when cured. 
     
     
         5 . The system of  claim 1 , wherein the liquid applied flashing membrane comprises a silyl-terminated polyether, a filler material, and a curing catalyst. 
     
     
         6 . The system of  claim 5  wherein the silyl-terminated plyether comprises 20% to 40% by weight of the composition. 
     
     
         7 . The system of  claim 1  wherein the silyl-terminated polyether is polypropylene oxide capped at respective termini by a silyl group represented by: —SiR 1   t (OR 2 ) 3−t , wherein, t is 0, 1 or 2, R 1  and R 2  are the same or different and independently an alkyl group. 
     
     
         8 . The system of  claim 7  wherein the silyl group is dimethoxymethylsilyl. 
     
     
         9 . The system of  claim 1  wherein the filler material is calcium carbonate. 
     
     
         10 . The system of  claim 1  wherein the curing catalyst is an organotin compound. 
     
     
         11 . The system of  claim 1 , further comprising one or more light stabilizers. 
     
     
         12 . The system of  claim 11  wherein the one or more light stabilizers are hydroxyphenylbenzotriazole, bis(1,2,2,6,6-pentamethyl-4-piperidyl) sebacate, or a combination thereof. 
     
     
         13 . The system of  claim 1 , further comprising an adhesion promoter. 
     
     
         14 . The system of  claim 13  wherein the adhesion promoter is an alkoxysilane. 
     
     
         15 . The system of  claim 1 , further comprising a dehydrator. 
     
     
         16 . The system of  claim 15  wherein the dehydrator is vinyltrimethoxysilane. 
     
     
         17 . The system of  claim 1 , further comprising a plasticizer. 
     
     
         18 . The system of  claim 17  wherein the plasticizer is diisodecyl phthalate. 
     
     
         19 . The system of  claim 1 , further comprising one or more pigments.