How to Replace Your Garage Door Bottom Seal

Weatherstripping acts as the primary defense for your garage against water, pests, and the elements. Over time, rubber seals become brittle, crack, or tear, leaving your garage floor vulnerable to the weather and creating a gap that invites rodents inside. Replacing this seal is a high-impact, low-cost maintenance task that instantly cleans up the look of your garage exterior. Successfully replacing the seal requires patience during the removal and installation phases. The trick is ensuring the tracks are perfectly clean so the new rubber glides in without snagging. If the seal is stubborn, a bit of soapy water or a lubricant will save you a massive headache during the sliding process.

  1. Power Down, Door Up. Open your garage door about waist-high to provide easy access to the bottom rail. Engage the emergency release if necessary to keep it held in position, or clamp the track to ensure it does not move while you work.
  2. Pry and Pull the Old Seal. Locate the ends of the bottom track and use a screwdriver to pry open any crimped metal edges that keep the seal in place. Pull the old rubber gasket out through the side of the door; if it is stuck, cut it into smaller sections to make extraction easier.
  3. Scrub Channels Clean. Use a wire brush or a damp cloth to scrub out dirt, grime, and dried-on debris from the inside of the aluminum channels. A clear, smooth track is essential for the new seal to slide in without binding or tearing.
  4. Lubricate for Smooth Glide. Spray a small amount of silicone-based lubricant inside the track channels along the entire width of the door. This reduces friction and allows the new rubber gasket to slide into place with minimal resistance.
  5. Feed the New Seal Home. Begin feeding the new rubber seal into the track starting from one end. Work as a team if possible: one person guides the rubber into the channel while the other pulls it across the length of the door.
  6. Crimp and Trim to Finish. Once the seal is centered, trim any excess material with a utility knife, leaving about an inch of overhang on each side. Use pliers to gently re-crimp the edges of the metal track to prevent the rubber from sliding out during operation.