Patented, foamed-in-place polyurethane core.
The core provides an insulation "R"-value of 12, more that twice as much as common polystyrene insulation board the same thickness. It's chemically bonded to the exterior steel surface, creating a composite structure with higher strength, greater rigidity, improved dent-resistance and better thermal protection.

Sound-absorbing insulation makes a 9900 Thermowayne door quieter in operation, and eliminates wind rattling. The polyurethane foam is CFC-11 free, so it's environmentally safe.

Integral foam-filled horizontal struts at to the top and bottom of door sections add rigidity for long life and smooth operation - extra strength without extra weight.

Lifetime Limited Warranty - against cracking, splitting, rust - through or section deterioration come with every 9900 Thermowayne garage door. Other door components also have extended warranties. Please ask for details.