Roofing Underlayment

Abstract

A laminated roofing underlayment includes a synthetic roofing underlayment on one side, a reflective layer on the other side, and insulation between the synthetic roofing underlayment and the reflective layer.

1 . A roofing underlayment having opposite sides, the roofing underlayment comprising:
 a synthetic roofing underlayment on one side;   a reflective layer on the other side, the reflective layer comprising a reflective outer surface on the other side of the roofing underlayment; and   an insulation layer between the synthetic roofing underlayment and the reflective layer, the insulation layer comprising insulation.   
     
     
         2 . The roofing underlayment of  claim 1  wherein the reflective layer comprises at least one of: aluminum foil, aluminum film, mylar, and polyethylene terephthalate. 
     
     
         3 . The roofing underlayment of  claim 1  wherein the reflective layer forms a non-smooth outer surface of the roofing underlayment. 
     
     
         4 . The roofing underlayment of  claim 1  wherein the reflective layer comprises scrim. 
     
     
         5 . The roofing underlayment of  claim 1  wherein the insulation comprises at least one of: fiberglass insulation, polyethylene foam insulation, bubble insulation, and an organic insulation. 
     
     
         6 . The roofing underlayment of  claim 1  wherein the insulation is fireproof. 
     
     
         7 . The roofing underlayment of  claim 1  comprising a first adhesive layer bonding together the reflective layer and the insulation layer. 
     
     
         8 . The roofing underlayment of  claim 7  wherein the first adhesive layer is an activated heat seal film. 
     
     
         9 . The roofing underlayment of  claim 7  wherein the first adhesive layer is formed from hot melt glue. 
     
     
         10 . The roofing underlayment of  claim 1  comprising a second adhesive layer bonding the synthetic roofing underlayment and the insulation layer. 
     
     
         11 . The roofing underlayment of  claim 1  wherein the roofing underlayment forms part of a roof assembly that comprises a roof deck and roofing material, the roofing underlayment on the roof deck, the roofing material overlaying the roofing underlayment. 
     
     
         12 . The roofing underlayment of  claim 11  wherein the roofing assembly meets the class A requirements of either the Underwriters Laboratory 790 standard or the ASTM International E108 standard in effect on the filing date of this application. 
     
     
         13 . The roofing underlayment of  claim 1  wherein the insulation layer comprises fiberglass insulation having a nominal thickness of about three-eighths of an inch. 
     
     
         14 . A method for forming a roofing underlayment comprising the steps of:
 bonding a synthetic roofing underlayment to one side of a layer of insulation; and   bonding a reflective layer to an opposite side of the layer of insulation, the reflective layer having a reflective surface forming an outer surface of the roofing underlayment after the reflective layer is bonded to the thermal insulation.   
     
     
         15 . The method of  claim 14  wherein the step of bonding the reflective layer comprises activating a heat seal film. 
     
     
         16 . The method of  claim 15  wherein the heat seal film is attached to the reflective layer prior to activation. 
     
     
         17 . The method of  claim 14  wherein the reflective layer comprises at least one of: aluminum foil, aluminum film, mylar, and polyethylene terephthalate. 
     
     
         18 . The method of  claim 14  wherein the reflective layer comprises an uneven outer surface of the roofing underlayment after the reflective layer is bonded to the thermal insulation. 
     
     
         19 . The method of  claim 14  wherein the insulation comprises at least one of: fiberglass insulation, polyethylene foam insulation, bubble insulation, and an organic insulation.