5. Measure the Head Room.
Measure from the floor to the ceiling. If there is an obstruction, such as a beam below the ceiling, then measure from the floor to the obstruction.
If the headroom dimension varies from left to the right side, then provide the smaller dimension. Be sure that the headroom dimension is consistant throughout the cycle of the garage door starting from the mounting service of the door jamb. Once you have the floor to ceiling dimension, subtract the door opening height listed in step 2 to yeild the "headroom." |