Garage Door Industry Officially Replaces R-Value with U-Factor
Why U?
For a multitude of reasons, the garage door industry has officially replaced R-Value with U-Factor as the standard measurement of thermal performance. Below are some links for further explanation, but here is a summary:
- R-Value is the measurement of energy efficiency in one area of a garage door section, typically from the thickest point. It does not account for around the perimeter or between the door’s section joints.
- U-Factor is the measurement of energy efficiency of the entire installed unit. Every area of the attached door is accounted for.
(Sources: DASMA Announcement, DASMA Technical Data Sheet #163)
What is U-Factor Exactly?
U-Factor measures how well a product can keep heat from escaping from the inside of a room. The lower the number, the better a product is at keeping heat in.
(Source: National Fenestration Rating Counsel® https://www.nfrc.org/)
What is Considered a “Good” U-Factor?
Most well insulated double-pane windows, that go in your living room, range from 0.15 – 0.30. You can see (and feel) this range by looking at the popular Pella® Impervia® line of windows and patio doors.
(Pella® Impervia® https://www.pella.com/ideas/windows/pella-impervia/)
What is the Range of U-Factors in Renner’s DELDEN® Door Collections?
| Door Collection | U-Factor |
| Delvation™ / Vintage 200 | 0.32 |
| Delvation™ / Vintage 300 | 0.27 |
| Delvation™ / Vintage 400 | 0.23 |
| Delvation™ / Vintage 500 | 0.24 |
| Delvation™ / Vintage 600 | 0.19* True White Flush, Short and Bead Board |
| Prestige 2000 | 0.43 |
| Delcraft 200 | 0.26 |
| Amarr® Classica® 2000 | 0.32 |
| Amarr® Classica® 3000 | 0.22 |
