How to Replace a Garage Door Bottom Seal
Cracked, brittle, or chewed-up bottom seal letting in cold air, leaves and bugs? Here's the 30-minute DIY fix that costs $20–$40.
How do I replace the bottom seal on my garage door?
Bottom seals (the U-shaped or T-shaped rubber strip that runs along the very bottom of your door) wear out every 5–10 years in NC's heat and freeze cycles. Replacing it is one of the few garage door repairs we genuinely recommend as DIY.
Step 1: Identify the retainer type. Most modern doors have an aluminum retainer with two parallel slots. The seal slides in from the side. Older wood doors have nailed-on T-seal.
Step 2: Measure the door width and add 6 inches. Buy seal by the foot at any big-box store ($2–$4/ft). For aluminum-retainer doors, get T-style; for older doors, get U-style or P-bulb.
Step 3: Spray a little dish soap and water into the retainer slots, then slide the new seal in from one end. Trim flush, and you're done. Total time: 30 minutes.
Key takeaways
- Bottom seals last 5–10 years in NC climate
- Buy T-style for aluminum retainers, U or P-bulb for old doors
- Soap+water lubricates the slide-in
- Total cost: $20–$40 in materials
Need a real garage door tech in Angier, NC?
Same-day service across Angier, Lillington, Fuquay-Varina and all of Harnett County.
Email office@angiergaragedoorrepair.com