Tag Archives: garage door r factor

The garage door industry association, the Door & Access Systems Manufacturing Association (DASMA ) is in the process of performing U factor testing and eliminating R rating on all garage doors.  This has been expected for some time as the major manufacturers (Clopay, Overhead Door, Wayne Dalton, CHI, Amarr/Entramatic and others) have been battling over who has the highest R-Factor.

Forty years ago a company, by the name of McKee Door, did testing on a 10′ x 10′ insulated door that didn’t have weather seals around the perimeter. They determined that they may as well have a 12 inch diameter hole in the center of the door due to air leakage. Perimeter seals are a major factor in buying an insulated garage door. Regrettably no one in our industry provides anything close to the kind of seals that the window entry door industries provide on their products.

So while consumers and door dealers get hung up on polystyrene/urethane doors with fictitiously high R-Factors, they are doing nothing less than selling the consumer a bill of goods. It’s reminiscent of the same commotion that energy tax credits and pinch-proof doors provided and flooded the industry for a number of years.

A conditioned air space and an [more]