How to seal a garage door?

How to seal a garage door?


Sealing a garage door is an essential step in maintaining the energy efficiency and security of your home. A properly sealed garage door can prevent drafts, water leaks, and unwanted pests from entering your garage. In this article, we will explore the steps and materials needed to effectively seal a garage door, ensuring a more comfortable and protected space.

Assessing the Garage Door

Before you begin sealing your garage door, it is crucial to assess its condition. Inspect the door for any cracks, gaps, or damaged weatherstripping. Look for areas where air, water, or light can penetrate. Identifying these problem areas will help you determine the necessary steps to seal your garage door effectively.

Materials Needed

To seal a garage door, you will need the following materials:

1. Weatherstripping: Weatherstripping is a flexible material that can be attached to the edges of the garage door to create a seal. It comes in various types, such as adhesive-backed rubber or vinyl strips, brush strips, or bulb seals. Choose the appropriate weatherstripping based on your garage door’s design and the severity of the gaps.

2. Garage Door Threshold Seal: A threshold seal is a durable strip that is installed at the bottom of the garage door. It creates a barrier against drafts, water, and pests. Threshold seals are available in different materials, including rubber, vinyl, or aluminum.

3. Sealant: Depending on the type of garage door you have, you may need a sealant to fill in any cracks or gaps. Silicone-based or polyurethane sealants are commonly used for this purpose.

4. Tools: You will need basic tools such as a measuring tape, utility knife, screwdriver, and a caulking gun (if using sealant).

Sealing Steps

Now that you have gathered the necessary materials, follow these steps to seal your garage door effectively:

1. Measure and cut: Start by measuring the dimensions of your garage door to determine the required length of weatherstripping and threshold seal. Use a measuring tape to get accurate measurements and cut the materials accordingly.

2. Install weatherstripping: Begin by attaching the weatherstripping to the sides and top of the garage door. Peel off the adhesive backing and firmly press the weatherstripping in place. Ensure a tight seal by pressing along the entire length of the strip.

3. Install threshold seal: Clean the bottom of the garage door thoroughly to ensure proper adhesion. Attach the threshold seal according to the manufacturer’s instructions. Typically, this involves applying adhesive to the bottom of the garage door and pressing the threshold seal firmly in place.

4. Apply sealant: If you notice any cracks or gaps in the garage door, use a sealant to fill them. Apply the sealant evenly, following the manufacturer’s instructions. Smooth out the sealant with a caulking tool or your finger for a neat finish.


Sealing your garage door is a simple yet effective way to improve energy efficiency and protect your garage from external elements. By following the steps outlined in this article and using the appropriate materials, you can ensure a well-sealed garage door that provides insulation, prevents water leaks, and keeps pests at bay.


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