Roofing underlayment

Abstract

A roofing underlayment comprising a carrier substrate included a felt mixture and a binder mixture, and a volume of asphalt flux saturating the carrier substrate. The felt mixture may comprise between about seventy-five percent and about ninety-five percent by weight corrugated paper/cardboard fibers and between about five percent and about twenty-five percent by weight fiberglass fibers. The volume of asphalt flux may comprise between about twenty-five and fifty percent of a total weight of the roofing shingle underlayment and may saturate the carrier substrate at a saturation percentage between about thirty and about one hundred percent. The binder mixture may include a mixture of alum and rosin having a mixture ratio by weight of alum to rosin in a range between one to one (1:1) and four to one (4:1).

We claim: 
     
         1 . A roofing underlayment comprising:
 a carrier substrate comprising a felt mixture and a binder mixture;   a volume of asphalt flux saturating said carrier substrate;   wherein said felt mixture comprises between seventy-five percent and ninety-five percent by weight corrugated paper/cardboard fibers and between five percent and twenty-five percent by weight fiberglass fibers; and   wherein said binder mixture comprises a mixture of alum and rosin having a mixture ratio by weight of alum to rosin in a range between one to one (1:1) and four to one (4:1).   
     
     
         2 . The roofing underlayment of  claim 1  wherein said volume of asphalt flux comprises between twenty-five and fifty percent of a total weight of said roofing shingle underlayment and saturates said carrier substrate at a saturation percentage between thirty and one hundred percent. 
     
     
         3 . The roofing underlayment of  claim 2  wherein said volume of asphalt flux saturates said carrier substrate at a saturation percentage between forty and sixty percent. 
     
     
         4 . The roofing underlayment of  claim 1  wherein said carrier substrate comprises between fifty and seventy-five percent of a total weight of said roofing underlayment. 
     
     
         5 . The roofing underlayment of  claim 4  wherein said volume of asphalt flux saturates said carrier substrate at a saturation percentage between forty and sixty percent. 
     
     
         6 . A roofing underlayment comprising:
 a carrier substrate comprising a felt mixture and a binder mixture, said felt mixture comprises between seventy-five percent and ninety-five percent by weight corrugated paper/cardboard fibers and between five percent and twenty-five percent by weight fiberglass fibers and said binder mixture comprises a mixture of alum and rosin having a mixture ratio by weight of alum to rosin in a range between one to one (1:1) and four to one (4:1); and   a volume of asphalt flux saturating said carrier substrate, wherein said volume of asphalt flux results in a carrier saturation of between forty and fifty-five percent.