The size largely depends on the truck sizes that will go into the garage it s better to take measures of the largest possible truck.
Overhead garage door ceiling height.
The most common commercial garage door sizes have 24 1 height and 32 2 width.
Standard systems require 10 inches of headroom while some require 12 inches while garage door openers often require an additional three inches of clearance.
How much headroom is required above a residential garage door.
Measure the head room the distance between the top of the door opening or door jamb header and the ceiling of the garage.
121 mm to 12 in.
In order to install torsion spring hardware we recommend a clearance of 12 in.
For example using this rule you could place three 12 foot wide doors on a 44 foot wall.
The reason for the additional clearance for torsion spring doors is due to the brackets that hold each end of the torsion bar.
10 254 mm radius 3 note.
For overhead garage doors a general rule of thumb is to maintain a minimum of 2 feet between doors as well as from any building corner.
On the other hand if there is only 4 in.
304 mm available it is best to use a dual track system designed for low headroom.
To calculate this simply add the width of the doors together 3x12 36 and subtract this from the wall length 44 36.
8 216 mm.
2 garaga strongly recommends the use of safety cables with extension springs for security.
If an electric operator is being used add 2 51 mm to the headroom required.