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Residential Sectional Garage Door How to Measure the Opening

While the actual finished opening will determine the size of the overhead garage door the surrounding conditions will determine the track configuration

The size of the finished opening should be the exact same size as the sectional garage door or down to 1” smaller on each side and/or the top. While technically the door could overlap the opening as much as the space will allow, the design on the outside of the door disappearing behind the jamb will tend to distract from the overall outside appearance. Furthermore if the opening is larger than the door the door may not seal properly against the elements and may also distract the overall appearance.

Although it is not necessary to measure the opening before requesting a garage door estimate the drawing below (Diagram A) shows the important measurements for the installation of your new overhead sectional garage door.

Width	___’___”	Distance in-between the two jambs on the outside of the opening
Height	___’___”	Distance from the floor to the bottom of the header
Headroom	___’___”	Distance from bottom of header up to the nearest obstruction (Re: pipes or air vents) or ceiling. 12” min required for standard lift track
Left Sideroom	___’___”	Distance from the left jamb to the nearest obstruction or wall to the left. 3-1/2” min required
Right Sideroom	___’___”	Distance from the right jamb to the nearest obstruction or wall to the right. 3-1/2” min required
Backroom - Door	___’___”	Door height plus 1’0
Backroom - Door Opener	___’___”	Door opener requires approx 12’2” for doors up to 7’6 tall & increases as door gets taller