1 lb. density Polystyrene (standard)/Optional 2 lb. Polyurethane core
“U” Factor = 0.41/STC = 35
“R” Factor = 2.43 (per ASTM C1363)
Polyurethane Core
“U” Factor = 0.39/STC = 33
“R” Factor = 2.56 (per ASTM C1363)
Fiberglass batting between each stiffener
“U” Factor = 0.61
“R” Factor = 1.65
(Optional) Polystyrene or polyurethane between stiffeners
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