2026-04-16 6 min read
Most Keller homeowners overlook weatherstripping until their energy bills spike or they find water on the garage floor after a spring storm. It's one of those things that quietly degrades over months and years. until suddenly it's obviously not working anymore. Given what Keller weather throws at a garage door year-round, it's worth understanding what good weatherstripping actually does and how to know when yours has given up.
Keller sits in a climate that doesn't give weatherstripping an easy life. Summers are hot and muggy, with temperatures regularly pushing into the mid-90s. Winters bring cold fronts that can drop temps well below freezing. And spring? That's when the real storms roll through. heavy rain, hail, and wind gusts that can hit 40 mph or more.
Every one of those conditions puts stress on your weatherstripping in a different way. The UV rays and heat of a Texas summer dry out and crack rubber and vinyl seals. Cold temperatures make them brittle and less pliable. And when a strong storm pushes rain sideways into your garage. something that happens regularly in the DFW area. worn weatherstripping is the only thing standing between your garage floor and an inch of water.
Beyond water intrusion, failed weatherstripping affects your energy bills. If your garage is attached to your home, a gapped bottom seal or side seal lets conditioned air escape and unconditioned air pour in. In July, that means your air conditioner is fighting the heat radiating off a poorly sealed garage.
Understanding which seal does what helps you diagnose problems faster:
Bottom seal (door sweep): This is the rubber or vinyl strip that runs along the bottom of your door and contacts the garage floor when the door closes. It handles water intrusion, pests, and drafts. It takes the most abuse. it's compressed every time the door closes. and it typically needs replacement every 3,5 years in North Texas conditions.
Top seal: A strip that runs across the top of the door frame. It's often overlooked because it's harder to see, but a gap at the top lets in rain, dust, and conditioned air just as readily as a gap at the bottom.
Side seals (stop molding): These run vertically along both sides of the door frame. In neighborhoods like Hidden Lakes or Bourland Oaks. where many homes have brick exteriors with attached garages. the side seals create the contact between the door and the frame on each side.
Panel seals: On sectional doors, flexible vinyl or rubber strips between each panel section prevent air and water from working through the horizontal joints. These are especially important for doors that face strong prevailing winds.
You don't need to be a contractor to spot these problems:
- Light test: Close your garage door at night and stand inside with the lights off. If you can see daylight coming through around the edges or bottom, you have gaps that need addressing. - Water on the floor after rain: Even a small puddle near the door edges or bottom after a storm means your seals aren't doing their job. - Cracks or brittleness: Run your hand along the bottom seal. If it flakes, cracks, or crumbles, it's past its service life. North Texas UV and heat accelerate this. - Visible gaps when the door is closed: Stand outside and look at where the door meets the frame. Any consistent gap. even a small one. is a problem. - Rising energy bills: If your attached garage feels noticeably hotter in summer or colder in winter, poor door sealing is a likely culprit.
Walk around your door with it fully closed. Check the bottom seal across its entire width. not just the center. In Keller homes, the concrete garage floor can settle or become uneven over time, creating gaps on one side even when the center looks fine. Check each side seal from top to bottom. Don't forget to look up at the top seal, especially if you've had recent wind-driven rain come through.
Not all weatherstripping is created equal, and the climate here demands materials that can handle temperature extremes.
For bottom seals, a T-style or bulb-style EPDM rubber seal holds up better in heat and cold than standard vinyl. EPDM stays flexible across a wider temperature range, which matters when your garage floor hits 110°F in summer and drops near freezing in winter. Avoid cheap foam or thin vinyl. they compress and deteriorate quickly under these conditions.
For side and top seals, look for UV-stabilized vinyl or rubber stop molding. Some homeowners in Southlake and Colleyville. where high-end homes are the norm. opt for painted wood stop molding with a foam backing, which works well but requires occasional repainting to prevent drying and shrinkage.
For panel seals, flexible PVC or rubber inserts are standard. If your door is older and you're seeing cracked or missing panel seals, it may be worth replacing the full door section rather than patching individual inserts. especially if the panels themselves are showing wear.
Bottom seal replacement is one of the more homeowner-friendly garage door maintenance tasks. Most bottom seals slide into a track or are retained by screws, and replacement seals are available at hardware stores. The main challenge is getting the right profile for your specific door track. Bring the old seal with you or take a photo of the track cross-section before buying a replacement.
Side and top seals are similarly manageable if you're comfortable with basic tools. Where you typically want professional help is when the door itself isn't sealing properly because of alignment issues, worn rollers, or a warped door section. no amount of new weatherstripping will compensate for a door that doesn't hang straight.
Keller Garage Doors includes a weatherstripping inspection as part of our standard maintenance and service visits. If you're not sure where your door stands, it's a good thing to have checked before the summer heat arrives or the next round of spring storms hits.
Given Keller's seasonal extremes, here's a simple weatherstripping maintenance routine that works:
- Each spring (March,April): Inspect all seals before storm season. Replace anything cracked or brittle. Clean the bottom seal channel of debris. - Each fall (October): Do a light test and visual check before winter fronts arrive. Apply a silicone-based conditioner to rubber seals to keep them pliable through the cold. - After any major storm: Check for water intrusion and look for seal damage caused by debris impact.
If you want to take a broader look at what regular preventive maintenance actually saves you in repair costs, the maintenance value analysis is a useful read. And if you're already seeing issues that go beyond just the seals, our services page covers the full range of what we handle.
In North Texas, most bottom seals last 3,5 years before showing significant wear. Homes with concrete floors that have settled unevenly or doors that are used 8,10 times per day may see wear faster. A quick annual inspection will tell you where things stand.
Yes, over time. Repeated water intrusion from a failed bottom or side seal can damage drywall, wood framing, and flooring in an attached garage. It also creates conditions for mold growth. In Keller's humid summers, a garage that retains moisture is a real mold risk.
Absolutely. A well-sealed door noticeably reduces road noise, wind noise during storms, and the fine dust that's common in North Texas. For homeowners whose garage connects directly to living space, this makes a real difference in day-to-day comfort.