The Classic Steel Garage Door Model 8300 has an impressive R-value* of 12.12 using polyurethane foamed-in-place. The Classic Steel Garage Door Model 8500 is Wayne Dalton’s highest insulated residental garage door with an impressive R-value of 16.22 using polyurethane foamed-in-place. Heavy-gauge steel wrap around end caps trim-out door edges for better appearance, improved strength and damage-protection of the insulation. Plus its two-coat, baked-on polyester finish makes it virtually maintenance free
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