U-factor & R-value of Garage Door Insulation

Sectional Door Insulation Ratings

Understanding R-value

The R-value evaluates the thermal resistance of a sectional door. It represents how well the door can impede the flow of heat. The higher the R-value, the greater the insulation capability of the door. U-factor is not the reciprocal of R-value for residential garage or commercial sectional doors.

U-factor vs. R-value

Measurement

The biggest difference between R-value and U-factor ratings is how they are measured. R-value ratings are calculated mathematically by measuring a single section of a garage or commercial sectional door. U-factor ratings, on the other hand, are calculated by measuring the whole door system installed (the entire door, siding, framing, wall, materials used, etc.). This gives a more accurate thermal transference rating and as such, a more accurate picture of the thermal insulation efficiency.

Rating Accuracy

Another reason for the move to U-factor, is that it is difficult to accurately measure the R-value of a section of a panel that is not completely flat(flat (i.e. panels that have grooves or indentations cannot be accurately tested with R-value). U-factor gives a more accurate rating of the entire door, while R-value only measures a section of a single panel. Overhead Door Corporation Participates in the Door & Access Systems Manufacturing Association (DASMA) Thermal Performance Verification Program. The program verifies the thermal performance of residential sectional garage doors and commercial sectional doors

Overhead Door™ U-Factor & R-Value Ratings

Below is a list of our garage and commercial doors and the U-factor/R-value of each one.

Residential Garage Doors

Residential Collection	Model	Insulation Type	U-factor*	R-value**
Traditional Steel	1600	Polystyrene	0.29	9.8
Durafirm Collection^®	3560	Polyurethane	0.25	11.75
Thermacore^®	5720	Polyurethane	0.27	9.31
Thermacore^®	5740	Polyurethane	0.22	12.76
WindStorm™	5745	Polyurethane	0.21	12.12
Thermacore^®	5760	Polyurethane	0.17	17.5
WindStorm™	5765	Polyurethane	0.18	16.22
Impression Steel	5800	Polyurethane	0.21	12
Courtyard Collection^®	7520	Polyurethane	0.27	9.3
Carriage House	7540	Polyurethane	0.27	10
Courtyard Collection^®	7560	Polyurethane	0.22	12.76
WindStorm™	7565	Polyurethane	0.21	12.12
Impression Fiberglass Collection^®	7800	Polyurethane	0.20	7.6
Aluminum Full-View	9920	Insulated Glass	0.93	0
Aluminum Full-View	9920	Low E Insulated Glass	0.85	0

Commercial Doors

Commercial Collection	Model	Insulation Type	U-factor*	R-value**
Insulated Steel-Back	470	Polystyrene	0.29	9.83
Thermacore^® Sectional Steel	591	Polyurethane	0.19	14.86
Thermacore^® Sectional Steel	592	Polyurethane	0.17	17.5
Thermacore^® Sectional Steel	593	Polyurethane	0.22	12.76
Thermacore^® Sectional Steel	594	Polyurethane	0.22	12.76
Thermacore^® Sectional Steel	596	Polyurethane	0.17	17.4
Thermacore^® Sectional Steel	598	Polyurethane	0.27	9.31
Thermacore^® Sectional Steel	599	Polyurethane	0.17	17.5
Thermacore^® Sectional Steel	850	Polyurethane	0.14	26
WindStorm™	515	Polyurethane	0.21	12.12
WindStorm™	525	Polyurethane	0.18	16.22
Aluminum Full View	521	Insulated Glass	0.93	2.6
Aluminum Full View	521	Low E Insulated Glass	0.85	3.43

*U-Factors are based on independent testing and verified per ANSI/DASMA 105. For products other than aluminum full-view doors, testing was conducted on specific sizes of solid doors. Actual thermal performance may vary by door size and configuration.
***Overhead Door™ Brand* uses a calculated door section R-value for our insulated doors.

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