Logo 40 R Transparent.gif                  (305) 638-1002
    RoofDepotUSA.com
          "Your one stop roofing source!"   5511 NW 37th Ave.
          Miami, FL  33142
  R Values  
  Roofing Insulation Common Materials  
    Inches Long   Inches R  
  Type Thick Term R Type Thick Value  
  Iso 1.00 6.0 Concrete 1.00 0.3  
  Iso 1.50 9.0 LWC 1.00 1.4  
  Iso 2.00 12.1 Gypsum 1.00 0.6  
  Iso 2.50 15.3 Wood 1.00 0.9  
  Iso 3.00 18.5 Tectum 1.00 2.0  
  Iso 3.10 19.0 Sprayed Foam 1.00 6.9  
  Iso 3.50 21.7 Soil (dry) 1.00 1.7  
  Iso 4.00 25.0 BUR Gravel   0.3    
  Composite 1.50 7.4 BUR Smooth   0.2  
  Fiberboard 0.50 1.3        
  Fiberboard 1.00 2.5        
  Perlite 0.50 1.3        
  Perlite 0.75 2.1        
  Perlite 1.00 2.8