How To Measure For A Garage Door

Measuring for a garage door is a crucial step to ensure a perfect fit and optimal functionality. Here's a step-by-step guide to assist you in accurately measuring your garage opening for a new or replacement garage door:

Materials You'll Need:

Measuring tape
Pencil or pen
Ladder

Step 1: Measure the Width

Measure the width of the garage opening from the inside edge of the left jamb to the inside edge of the right jamb. Take the measurement at the top, middle, and bottom of the opening. Record the widest of the three measurements.

Step 2: Measure the Height

Measure the height of the garage opening from the finished floor to the top of the header. The header is the horizontal beam above the garage door opening. Take the measurement in the center of the opening.

Step 3: Determine the Backroom

Measure the distance from the back of the opening to the front of the header. This measurement is known as the "backroom" and is essential for determining the appropriate door size.

Step 4: Consider Headroom

Measure the vertical distance from the header to the bottom of the garage door opener rail or any other obstruction located within the opening. This measurement is crucial to ensure there is sufficient headroom for the door to operate smoothly.

Step 5: Siding Overlap

Measure the distance from the edge of the garage door jamb to the edge of the siding. This measurement determines how much overlap the siding will have over the garage door jamb.

Step 6: Check Level and Plumb

Using a level and plumb bob, verify that the garage opening is level (horizontally) and plumb (vertically). Ensure there are no significant deviations, as they may affect the fit and operation of the garage door.

Step 7: Record Measurements

Once you have taken all the necessary measurements, record them accurately on a piece of paper or in a digital format for future reference. It's important to indicate the width, height, backroom, headroom, siding overlap, and any other relevant observations.

Additional Tips:

If the garage opening is not square, take multiple measurements and use the largest ones for accuracy.
Consider the type of garage door you plan to install, as sectional doors require additional headroom compared to roll-up doors.
If the opening is significantly out of level or plumb, it may require additional framing or adjustment before installing the garage door.
For optimal performance and longevity, choose a garage door that is slightly smaller than the opening to allow for proper weatherstripping and operation.

By following these steps and tips, you can confidently measure your garage opening and ensure a perfect fit for your new garage door.