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U-factor & R-value of Garage Door Insulation

Sectional Door Insulation Ratings

Understanding U-Factor

Is U-value the same as U-factor? U-value is used differently across the building and manufacturing industry, in some instances being introduced as the reciprocal of R-value. Only U-factor is used in the building codes for door and windows. Therefore, Overhead Door™ Brand will remove all U-value listings. This will remove any confusion regarding the meaning of U-value for the residential garage and commercial door industry and further emphasize the integrity of U-factor certified ratings.

U-Value vs. U-Factor

Is U-value the same as U-factor? U-value is used differently across the building and manufacturing industry, in some instances being introduced as the reciprocal of R-value. Only U-factor is used in the building codes for door and windows. Therefore, Overhead Door™ Brand will remove all U-value listings. This will remove any confusion regarding the meaning of U-value for the residential garage and commercial door industry and further emphasize the integrity of U-factor certified 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 for 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
​Insulation Type
U-factor*
​R-value**

​Commercial
​Insulation Type
U-factor*
R-value**
​Traditional Steel Model 1600
​Polystyrene
​.23
​9.8



​ ​ ​ ​ ​ ​
​Insulated Steel-Back - Model 470
​​Polyurethane
​.23
​9.83
​Durafirm Collection Model 3560
​Polyurethane
​.24

​11.75
​Thermacore Sectional Steel - Model 591
​​Polyurethane
​.13
​14.86
​Thermacore Model 5720
​Polyurethane
​.20
​9.31
​Thermacore Sectional Steel - Model 592
​​Polyurethane
​.10
​17.5
​Thermacore Model 5740
​​Polyurethane
​.15
​12.76
​Thermacore Sectional Steel - Model 593
​​Polyurethane
​.15
12.76​
​Thermacore Windload Model 5745
​​Polyurethane
​.15
12.12​
​Thermacore Sectional Steel - Model 594
​​Polyurethane
​.15
12.76​
​Thermacore Model 5760
​​Polyurethane
​.10
​17.5
​Thermacore Sectional Steel - Model 596
​​Polyurethane
​.10
17.4​
​Thermacore Windload Model 5765
​Polyurethane
​.12
​16.22
​Thermacore Sectional Steel - Model 598
​​Polyurethane
​.20
9.31​
​Impression Steel Model 
​​Polyurethane
​.18
​12
​Thermacore Sectional Steel - Model 599
​​Polyurethane
​.10
17.5​
​Courtyard Collection
​​Polyurethane
​.20
​9.3
​Thermacore Sectional Steel - Model 850
​​Polyurethane
​.07
26​
​Carriage House
​Polyurethane
​.16
​10
​Sectional Steel Windload - Model 515
​​Polyurethane
​.15
16.12​
​Courtyard
​Polyurethane
​.15
​12.76
​Sectional Steel Windload - Model 525
​​Polyurethane
​.12
16.22​
​Courtyard Windload
​​Polyurethane
​.15
​12.12
​Aluminum Full View
Insulated Glass - Model 521
​Insulated Glass
​.30
2.6​
​Impression Fiberglass
​​Polyurethane
​.15
​7.6
​Aluminum Full View
Low-E Insulated Glass - Model 521
​Low E Insulated Glass
​.28
3.43​
​Aluminum Full-View
​Insulated Glass
​.30
​0
​Aluminum Full-View
​Low E Insulated Glass
​.28
​0





*U-factor values are independently tested and verified per ANSI/DASMA 105.
**Overhead Door uses a calculated door section R-value for our insulated doors.

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