Sealing Gaps Along The Side of a Garage Door

A well-sealed garage door not only improves the energy efficiency of your home but also protects your garage from pests, dust, and external weather elements. Here in the Houston area, if you don’t close these gaps, you can have numerous issues like pests or mold inside your garage from moisture getting in. Fortunately, sealing these gaps is a straightforward DIY project that can be completed in a few steps. Here’s how to ensure your garage door is as efficient and secure as possible.

Step 1: Identify the Gaps

Before you can seal any gaps, you need to identify where and how large they are. Close your garage door and inspect it from the inside during the daytime. Look for any light coming through the sides. These are the areas where air and pests can enter, and they indicate where you need to focus your sealing efforts.

Step 2: Choose the Right Sealant

There are several types of sealants available for garage doors, but the most common and effective for sealing side gaps are weatherstripping and brush seals.

  • Weatherstripping: This typically comes in a rubber or vinyl strip that can be nailed or screwed into place. It’s flexible and can easily compress to fill in the gaps.
  • Brush Seals: These consist of a row of bristles that are attached to a metal or plastic backing. The bristles conform to the surface of the wall and block out air and pests without preventing the door from moving freely.

Step 3: Clean the Area

Before applying any new sealant, make sure the area where you’ll be working is clean. Remove any dirt, debris, or old sealant from the edges of the garage door frame. This ensures that the new sealant adheres properly and provides a tight seal.

Step 4: Measure and Cut the Sealant

Measure the length of the area where you’ll be applying the sealant. Whether you’re using weatherstripping or brush seals, it’s important to measure twice to ensure accuracy. Cut your sealant material to length with scissors (for rubber or vinyl) or a hacksaw (for brush seals with metal backing).

Step 5: Install the Sealant

  • For Weatherstripping:
    • If using self-adhesive weatherstripping, peel off the backing to reveal the adhesive, and carefully press it into place along the door frame, ensuring there are no wrinkles or bubbles.
    • For weatherstripping that requires nails or screws, align it along the door frame and fix it into place using a hammer or drill.
  • For Brush Seals:
    • Align the brush seal along the edge where the door meets the frame. The bristles should lightly touch the door without preventing it from moving.
    • Use screws to secure the brush seal into place. It’s often best to drill pilot holes to make this step easier and prevent damage to the frame.

Step 6: Test the Door

After installing the sealant, close and open the garage door several times to ensure the sealant isn’t hindering its movement. Check from the inside again to see if there are still any light leaks. Adjust the seal as needed if gaps are still visible.

Step 7: Maintain Regularly

Like any part of your garage door, the side seals can wear out and degrade over time. Inspect them regularly, especially before and after the harsh Houston weather seasons, and replace them as necessary to maintain their effectiveness.


Sealing the gaps along the side of your garage door is an effective way to enhance your home’s overall energy efficiency and prevent unwanted guests and elements from entering your garage. The process is simple enough to do on your own, but if you run into any issues or prefer professional help, Spectrum Overhead Door is always here to assist with your garage door repair needs in Houston. Proper maintenance and timely repairs will keep your garage door operating smoothly year-round. Stay tuned for more helpful tips and tricks from your local garage door experts!



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Garage Door MaintenanceSealing Gaps Along The Side of a Garage Door