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Home / How To Measure Garage Door

Download Our Garage Door Opening Drawing


Opening width:

Step 1: Measure the width of the opening at the widest point. This is the distance between the right and left sides of the finished opening. For best results, the inside of the garage door opening should be framed with 2" x 6" wood. Look for general irregularities, such as jambs which are not square

Opening height:

Step 2: Measure the height of the opening at the highest point. This is the distance between the floor and the top of the finished opening. Look for general irregularities, such as un-level floor.


Step 3: Measure the width of the areas beside the openings. Up to 5" is required on each side for installation of the vertical track. If this is a 2-door installation, center post should be a min. of 10" wide.


Step 4: Measure the area between the top of the door opening and the ceiling (or to the lowest obstruction at ceiling).


Step 5: Measure the distance from the opening to the rear of the garage or nearest obstruction. The door's backroom requirement is the door height plus an additional 18" for manual lift doors. If an electric opener is to be installed, the door's backroom requirement is the door height plus and additional 4'2".


Additional items to observe:

■ Verify electrical outlet for door opener use.

■ Note any lights or stairs in the way.

■ Verify all jambs are in good condition, header is stable.

■ Verify the level of the floor. Was the previous door a custom fit?

■ Note any pipes, ductwork, etc. above the door that might obstruct operation of the door.





A few things to consider before selecting the perfect door for your home.

Garage Door Components

1) Window Lite Glazed section with various types of glass or acrylic to allow for light and visibility.

2) Sections Steel panels reinforced with stiles interconnected with hinges and rollers.

3) Bottom Bracket A structured support that provides for attachment of lifting cables.

4) Cable Drum Grooved drums on the torsion spring shaft that allow lifting cables to wind when garage door opens.

5) Torsion Springs Provides the means to raise and lower garage doors via cable winding on drums.

6) Extension springs  extend along both horizontal tracks

7) Rear Track Hanger

8) Track Guides a section to raise or lower garage doors.

Track Types:
Low Headroom

Track Components:
Vertical Track: on either side of opening.
Horizontal Track: attached to ceiling.
Radius: curved track

Standard Heights:
7 feet high - 4 sections high
8 feet high - 5 sections high

Extended Heights - available up to 16 feet high

Headroom Chart
4-1/2'–10" – low headroom track
10" – standard track/extension spring
12" – standard track/torsion spring
14" or more – required for operator

Garage Door Insulation

Insulation and the steel gauge of a door is important. If you plan on spending a lot of time in your garage, have a room above or adjacent to your garage, or have a lot of activity, such as children playing in front of the doors, then you want to consider the R-Value and the thickness of the steel. R-Value is a measurement of thermal efficiency of a door. The higher the R-Value the better insulated the door. If there is the chance of basketballs hitting the outside of the door, you need to consider a heavier gauge steel, such as a 24 gauge. Remember, the lower the number, the stronger the steel.

What is insulation and why is it important?

Insulation is material that has the ability to reduce heat or cold transmission.

Insulation Terms:

Amount of heat necessary to raise the temperature of one pound of water one degree Fahrenheit.

Laboratory-determined value of the thermal conductance of a material.

Ability of a material to retard the transmission of heat. The higher the R-Value, the better the insulating performance.

Amount of heat, in BTU, transmitted through one square foot of material (the door) in one hour at a temperature difference of one degree Fahrenheit from one side to the other. The lower the U-value, the better the insulation.