The Caulk Gun Isn't the Answer
When a garage door starts letting in water, bugs, or that fine red dust that settles on everything after a dry spell, most homeowners reach for the same tool: a tube of silicone caulk. It's cheap, it's at every hardware store, and smearing a bead along the bottom of the door feels like a five-minute fix. The problem is that the bottom of a garage door moves every single time the door opens and closes. Caulk is rigid once it cures. Within a few weeks of operation, it cracks, peels, or tears away in strips, and you're back where you started, except now there's a mess of dried sealant stuck to your concrete.
The actual fix is a rubber bottom seal and matching weatherstripping along the sides and top, both of which are designed to flex thousands of times without failing.
Why This Matters More Here
Afternoon downpours during the warmer months push water sideways under doors that don't seal tight, and humidity swells wood-framed doors and jambs enough to open gaps that weren't there in a drier season. Those same gaps let in pests looking for shelter and let moisture reach springs, tracks, and hardware, which speeds up rust. A good seal is one of the cheapest things you can do to protect the rest of the door system.
What You'll Need
- Tape measure
- Utility knife
- Flathead screwdriver
- Rubber mallet
- Replacement bottom seal (bulb-style or T-style, matched to your existing track) and side/top weatherstripping if needed
- A bucket with mild soapy water and a rag
- Work gloves
Step-by-Step: Replacing the Bottom Seal
- Identify your seal type. Look at the bottom edge of the door. If the seal sits in a U-shaped metal retainer, it's likely a bulb-style seal. If it has a bead that slides into a groove in the door itself, it's a T-style seal. Buying the wrong type means it won't lock in.
- Measure the width of the door. Add a few inches of slack; it's easier to trim excess than to come up short.
- Remove the old seal. Use the flathead screwdriver to pry the retainer open slightly, then pull the old seal out of the track or groove. It may come out in brittle pieces if it's been baking in the sun for years.
- Clean the track or groove. Wipe out dirt, old rubber fragments, and grit with the soapy rag. Debris in the channel will keep the new seal from sitting flush.
- Feed the new seal in from one end. Work it through the full length of the track, using the rubber mallet gently if it's tight. Don't force it from the middle; it can bunch up and jam.
- Trim to length. Cut the excess with the utility knife once it's fully seated, leaving it flush with the edges of the door.
- Lower the door and check contact. The seal should compress evenly along the entire bottom edge with no visible gaps.
- Check side and top weatherstripping the same way. These usually nail or slide into place along the jamb and can be replaced with basic hand tools.
Where the Line Is
Replacing the seal itself is genuinely a homeowner-level job if the door opens and closes normally and sits level when it's down. But if you notice any of the following, stop and call a technician instead of pushing through:
- The door doesn't sit flat on the floor, so the new seal never makes full contact
- The track is visibly bent, rusted through, or pulling away from the frame
- The seal keeps tearing out again within weeks, which usually points to the door being off track or unevenly tensioned, not a bad seal
- There's water pooling because the concrete threshold itself has settled or cracked
These point to a mechanical issue with the door, not the weatherstripping, and working around them without fixing the real cause just wastes time and seal after seal.
When to Call White Springs Overhead Door Co
If your door won't sit flat, feels heavy or uneven as it moves, or you've replaced the seal more than once without the drafts going away, it's worth having it looked at. Our Off Track Door Repair service addresses doors that aren't sitting square so a new seal can actually do its job, and our Garage Door Tune-Up & Maintenance checks tracks, rollers, and hardware for rust or wear before the next round of humidity and storms sets in.
If you're in White Springs, Live Oak, Lake City, Jasper, Wellborn, Fort White, Jennings, or Lee and your garage door is letting in more weather than it should, give White Springs Overhead Door Co a call. We'll get it sealed properly and check the rest of the door while we're there.