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Measure Storm Door Openings Precisely to Prevent Problems Later

Installing a new storm door can help protect your home from weather damage while adding aesthetic appeal. But accurately measuring the doorway is an essential first step - improper measurements can lead to doors that don't fit right or fail to function properly.

Careful measurement the first time prevents headaches, delays, and added expenses down the road.

When to Measure a Storm Door Opening

Measuring the doorway is the first step whether you're installing a new storm door or replacing an existing one. It's also important if you're experiencing any problems with an installed door, as improper fit could be the culprit.

measuring a storm door

New Storm Door Installations

For new installations, careful measurement ensures you order the right size door for the opening. Measure first, then use the dimensions to select standard-sized or custom doors as needed.

Replacing Existing Doors

When replacing old or damaged doors, don't assume the new unit should match the old size. Measuring first allows you to identify and correct any underlying measurement problems.

Troubleshooting Size Issues

If an installed storm door sticks, doesn't close properly, or has alignment issues, inaccurate measurements could be to blame. Re-measure the opening to check for mistakes.

What Measurements to Take

Two key dimensions are needed to size storm doors properly:

Doorway Height

Use a steel tape to measure from the floor up to the top of the interior door frame. For accuracy, have another person assist by holding the tape vertically aligned while you position the base at floor level.

Note any obstructions that may impact the storm door installation or operation, like exterior light fixtures. We'll detail how to account for these later.

Door Opening Width

To determine the right width, close the interior door first. Then measure the full spread from side-to-side, accounting for trim and framing. This gives the necessary width for clearing the closed door.

Be sure to measure at multiple points from top to bottom. Use the smallest dimension to size the storm door to avoid alignment issues.

How to Measure

Follow these best practices when measuring to ensure accuracy:

Steel Tape Measures

For storm door projects, a 25-foot retractable steel tape measure is ideal. Ensure the units are clearly marked in 1/8" increments for precision. Extend the tape fully when measuring height to prevent sagging.

Laser Measuring Tools

Laser distance measurers use reflected light to capture dimensions. They can be easier for one person but still require multiple measurements to verify accuracy.

Don't rely solely on the digital readings - manually record all dimensions for reference.

Multiple Measurements

Regardless of equipment used, measure all openings at least twice. Compare the numbers, re-measuring a third time if any discrepancy. This ensures you have the precise sizing needed for proper door selection and installation.

Accounting for Obstacles

Ensure you account for any items like decorations, mailboxes, or lighting that impede the doorway. Failure to do so can make doors difficult to install or operate.

Mailboxes

Wall-mounted mailboxes near doors need special attention. Measure the box distance from the opening to check for clearance. A custom-sized door may be required to accommodate the mailbox.

Exterior Lighting

Check exterior lighting, sconces, or hanging fixtures above or surrounding the door. Will the storm door strike or rub against such features when opened outward? Adjust placement or order a custom door size to prevent issues.

Decorative Trim

Some homes feature detailed exterior trim, pillar framing, or decorative elements bordering the door. Account for such ornamental features when measuring to ensure the storm door doesn't damage or interfere with them.

Ensuring Proper Fit

With accurate opening measurements in hand, take steps to verify suitable storm door sizing:

Consult Old Door Sizing

When replacing an existing storm door, check any labeling on the old unit for size information. While not always accurate, it provides useful reference to help guide new door selection.

Verify Standard Sizes

Compare your measurements to common standard sizes like 36" x 81". If matching within 1/4", a stock door should suffice. But any greater difference suggests a need for custom manufacturing.

Calculate Total Inch Dimensions

For the most precise match, convert fractions to decimal inches, then add height plus width. A door labeled 36" x 81" converts to 45" total inches. Use total inches to directly compare old and new doors.

This also makes communicating dimensions easier when requesting specialty manufacturing.

Order Custom When Required

If measurements and calcuations reveal sizing issues, don't squeeze a poor-fitting standard door into place. Instead, order a custom manufactured storm door tailored to your unique opening dimensions.

Accurately measuring for storm doors takes a careful, methodical approach. But precise measurements the first time prevents problems down the road.

Follow the techniques outlined here - account for all obstacles, verify your numbers, and don't cut corners. Taking these steps ensures you order the right storm door on the first try for smooth, trouble-free installation.

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