Headroom required, calculation and frame for industrial garage door

Headroom required by type of lift

Type of movement Commercial hardware (2", 50 mm) Industrial hardware (3", 76 mm)
Low headroom front mount • 8" (203 mm) for doors up to 12 ft (3.7 m) high
• 10" (254 mm) for doors over 12 ft (3.7 m) high
13" (33 cm)
Low headroom rear mount 4 in. (10.2 cm) 11" (28 cm)
Standard lift • 12" (305 mm) for doors up to 12 ft (3.7 m) high
• 13.5" (343 mm) for doors over 12 ft (3.7 m) high
16" (41 cm)
High lift Total space above the door minus 10" (25 cm) Total space above the door minus 10" (25 cm)
Full vertical Twice the height of the door + 9" (23 cm) Twice the height of the door + 9" (23 cm)
Inclined According to the slope of the roof According to the slope of the roof
Type of movement Commercial hardware (2", 50 mm)
Low headroom 
front mount
• 8" (203 mm) for doors up to 12 ft (3.7 m) high
• 10" (254 mm) for doors over 12 ft (3.7 m) high
Low headroom rear mount 4 in. (10.2 cm)
Standard lift • 12" (305 mm) for doors up to 12 ft (3.7 m) high
• 13.5" (343 mm) for doors over 12 ft (3.7 m) high
High lift Total space above the door minus 10" (25 cm)
Full vertical Twice the height of the door + 9" (23 cm)
Inclined According to the slope of the roof
Type of movement Industrial hardware (3", 76 mm)
Low headroom 
front mount
13" (33 cm)
Low headroom 
rear mount
11" (28 cm)
Standard lift 16" (41 cm)
High lift Total space above the door minus 10" (25 cm)
Full vertical Twice the height of the door + 9" (23 cm)
Inclined According to the slope of the roof

View all types of lift in pictures

Door frame

Pro_door_frames.gif

Calculation to determine the headroom required for an overhead crane

Pro_ohd_crane.jpg

Bridge struts for large size doors

Pro_pont_anglais.gif

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

Pro_hardware.jpg

These construction specifications and shop drawings are applicable to GARAGA Inc. products only.

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