Headroom required, calculation and frame for residential garage door
Dura+ Hardware
| Torsion(1) (12" radius) | |
| Headroom required | Operation types |
| 0" to 5" (0 to 125 mm) |
Not possible (lower headboard of door) |
| 5" to 12" (125 to 305 mm) |
Low headroom (double track system) |
| 12" (305 mm and over) |
Standard (12" (305 mm) radius)(3) |
| Extension(2) (10" radius) | |
| Headroom required | Operation types |
| 0" to 5" (0 to 125 mm) |
Not possible (lower headboard of door) |
| 5" to 8 ½" (125 to 216 mm) |
Low headroom (double track system) |
| 8 ½" (216 mm and over) |
Standard (10" (254 mm) radius)(3) |
Note: if an electric operator is being used, add 2" (51 mm) to the headroom required.
(1) Garaga recommends the use of torsion springs for improves door operation and increased safety.
(2) Garaga strongly recommends the use of safety cables with extension springs for security.
(3) If you have more than 15" (381 mm) of headroom available, 15" (381 mm) radius tracks are available on request
Door frame
Calculation to determine the headroom required for an overhead crane
Bridge struts for large size doors
Headroom calculation:
(Please refer to drawing below)
Measure the distance between floor and ceiling = H
ex.: 14 ft. or 4270 mm
Measure the door opening = h
ex.: 12 ft. or 3658 mm
Substract 2 from 1
1 - 2 = Available headroom
The result (H-h) is greater then 406 mm
The result (H-h) is less then 406 mm
P.S. : Option
Low headroom hardware allows you to have very little headroom: between 4" (102 mm) and 11" (279 mm). Contact Garaga for more information
Standard lift
h = door height
H = total Height
d = 12" (2" track 12" radius)
15" (2" track 15" radius)
16" (3" track 15" radius)
| Door Thickness | Dimension "C" |
| 1 3⁄8" | 1 1⁄8" |
| 1 ¾" | 1 ½" |
| 2" | 1 ¾" |
Note: if adding a garage door opener onto an existing door: if you have 12" (305 mm) headroom with torsion spring operation, and you would like to install an electric operator, special top brackets (quick turniing brackets) are available.
Low headroom
h = door height
H = total Height
d = 5" (2" track)
11" (3" track)
| Door Thickness | Dimension "C" |
| 1 3⁄8" | 1 1⁄8" |
| 1 ¾" | 1 ½" |
| 2" | 1 ¾" |
General view of an overhead garage door with a torsion spring
These construction specifications and shop drawings are applicable to GARAGA Inc. products only.
