Construction

	1000 Single-Layer: Steel Get value and durability with a 1000 single-layer door. These heavy-duty steel doors are durable, reliable, and low maintenance. Heavy-Duty Exterior Steel Durable, Reliable, Low Maintenance

	2000 Double-Layer: Steel + Insulation A 2000 double-layer door provides durable, low maintenance features, plus a layer of vinyl-coated insulation for increased thermal properties and quieter operation. Heavy-Duty Exterior Steel Durable, Reliable, Low Maintenance Environmentally Safe Polystyrene Thermal Insulation with Vinyl Backing Energy Efficient Quiet Operation R-Value = 6.84

	3000 Triple-Layer: Steel + Insulation + Steel For the toughest, most energy-efficient steel door, a 3000 triple-layer door includes the ultimate in thermal properties, plus a layer of steel for a finished interior look and added durability. Heavy-Duty Exterior and Interior Steel Durable, Reliable, Low Maintenance Environmentally Safe Polystyrene Thermal Insulation Superior Energy Efficient Extra Quiet Operation R-Value = 6.58 (Oak Summit) R-Value = 9.19 (Heritage) R-Value = 13.35 (Classica)