Cool roof systems and methods

Abstract

A membrane roofing system that includes a waterproof layer that protects an insulation layer and a granule coupled to the waterproof layer. The granule has a 60% or greater reflectivity that reduces transmission of ultraviolet light to the waterproof layer. The granule is coated in a fluorinated acrylic copolymer that resists adsorption and absorption of asphaltic chemicals by the granule from the waterproof layer.

1 . A membrane roofing system, comprising:
 a waterproof layer configured to protect an insulation layer; and   an aluminum silicate granule having a particle size between 0.2 mm-2.4 mm coupled to the waterproof layer, wherein the aluminum silicate granule has a 65% or greater reflectivity and is configured to reduce transmission of ultraviolet light to the waterproof layer, and wherein the aluminum silicate granule is, before coupling to the waterproof layer, coated in a cationic fluorinated (meth)acrylic copolymer that resists adsorption and absorption of asphaltic chemicals by the aluminum silicate granule from the waterproof layer.   
     
     
         2 . The system of  claim 1 , comprising the insulation layer, wherein the waterproof layer couples to the insulation layer. 
     
     
         3 . The system of  claim 1 , wherein the aluminum silicate granule is porous. 
     
     
         4 . The system of  claim 1 , wherein the waterproof layer is an asphalt-based membrane. 
     
     
         5 . The system of  claim 4 , wherein the waterproof layer comprises a fiberglass, polyester or fiberglass/polyester matrix configured to reinforce the waterproof layer. 
     
     
         6 . The system of  claim 1 , wherein the reflectivity of the aluminum silicate granule is greater than 70%. 
     
     
         7 . The system of  claim 1 , wherein the reflectivity of the aluminum silicate granule is greater than 80%. 
     
     
         8 . The system of  claim 1 , wherein the fluorinated acrylic copolymer coating is at least 0.001% by weight of an uncoated aluminum silicate granule. 
     
     
         9 . A built-up roofing system, comprising:
 a first waterproof layer configured to protect an insulation layer;   a first fiberglass layer configured to support the first waterproof layer; and   an aluminum silicate granule having a particle size between 0.2 mm-2.4 mm coupled to the first waterproof layer, wherein the aluminum silicate granule has a 60% or greater reflectivity and is configured to reduce transmission of ultraviolet light to the first waterproof layer, and wherein the aluminum silicate granule is, before coupling to the first waterproof layer, coated in a fluorinated (meth)acrylic copolymer that resists adsorption and absorption of asphaltic chemicals by the aluminum silicate granule.   
     
     
         10 . The system of  claim 9 , comprising a second waterproof layer. 
     
     
         11 . The system of  claim 9 , comprising a second fiberglass, polyester, or fiberglass/polyester reinforced layer. 
     
     
         12 . The system of  claim 9 , comprising the insulation layer. 
     
     
         13 . The system of  claim 9 , wherein the aluminum silicate granule is porous. 
     
     
         14 . The system of  claim 9 , wherein the first waterproof layer is an asphalt-based membrane. 
     
     
         15 . The system of  claim 9 , wherein the reflectivity of the aluminum silicate granule is greater than 70%. 
     
     
         16 . The system of  claim 9 , wherein the reflectivity of the aluminum silicate granule is greater than 80%. 
     
     
         17 . The system of  claim 9 , wherein the fluorinated acrylic copolymer coating is at least 0.001% by weight of an uncoated aluminum silicate granule. 
     
     
         18 . A method of manufacturing a roofing system, comprising:
 coating an aluminum silicate granule having a particle size between 0.2 mm-2.4 mm and a reflectivity of 60%, wherein the coating comprises a fluorinated (meth) acrylic copolymer that resists adsorption and absorption of asphaltic chemicals by the aluminum silicate granule from a waterproof layer;
 drying the coating on the aluminum silicate granule; and 
 coupling the coated aluminum silicate granule to the waterproof layer. 
   
     
     
         19 . The method of  claim 18 , wherein the waterproof layer is an asphalt-based membrane. 
     
     
         20 . The method of  claim 18 , wherein the coating is at least 0.001% by weight of an uncoated aluminum silicate granule of the fluorinated acrylic copolymer.