2026-03-27 6 min read
There's a small strip of rubber or vinyl at the bottom of your garage door that most homeowners never think about. until it fails. In a place like Troy, NC, that failure has real consequences. Between the muggy summers that push humidity into the 80-90% range, the summer thunderstorms that roll through Montgomery County, and the occasional winter nights that drop into the 20s, your garage door's weatherstripping is constantly working. When it wears out, the problems that follow are more than just a draft.
This guide is specifically written for homes in and around Troy. Whether you're in one of the older ranch-style homes closer to downtown, a newer build out toward Southern Pines, or somewhere in a rural stretch off Highway 109, the weatherstripping on your door faces the same local conditions. and needs the same attention.
Weatherstripping refers to the flexible seals installed along the bottom, sides, and top of your garage door. Together, they close the gap between the door and the frame or floor. Garage door weather seals prevent outside elements. drafts, water, dirt, and insects. from entering your garage.
That matters more than people realize:
- Energy costs: An unsealed garage acts like an open window in your home's thermal envelope. If your garage is attached to the house, conditioned air escapes through gaps constantly, making your HVAC work harder. - Humidity and moisture: In Troy's summers, even small gaps let humid air flow freely into the garage. That moisture accelerates rust on any metal tools, equipment, or the door hardware itself. - Pests: Gaps in the seal are an open invitation for insects, mice, and other pests that are plentiful in our wooded, rural county. A tight seal keeps them out. - Water intrusion: Montgomery County gets meaningful rainfall year-round, and a deteriorated bottom seal allows water to pool on the garage floor after heavy rain.
For more on how summer heat specifically affects your garage door system overall, the tips in our post on preparing your door for warmer months are worth reading before the weather turns.
This is the rubber or vinyl strip mounted on the lower edge of your door. It compresses against the floor when the door closes. Common styles include T-shaped and bulb-shaped seals that slide into a metal retainer channel. This is the seal that takes the most abuse. it drags across the concrete floor thousands of times and gets baked by summer heat and cracked by winter cold.
These seals run around the perimeter of the garage door opening, between the door and the frame. They block wind, rain, dust, and insects from sneaking in around the sides and top. Side seals should stop just short of the ground. cutting them a quarter inch shorter than the full door height prevents them from sitting in water and rotting.
Unlike the bottom seal, a threshold seal attaches to the garage floor itself rather than to the door. It creates a raised barrier that blocks water and debris at floor level. This is especially useful if your driveway slopes toward the garage, which is common on the rolling terrain around Troy and out toward Asheboro. A threshold seal works best when combined with a bottom seal. together, they create a much tighter barrier than either one alone.
Don't wait until you find a puddle on your garage floor to inspect the seals. Walk around your closed door and look for these signs:
- Visible cracks, tears, or gaps in the rubber or vinyl - Light visible under or around the door when the garage is dark inside - Hardening or flattening of the material. old seals lose their flexibility and no longer compress properly - Insect activity or mouse droppings in the garage despite no obvious entry points elsewhere - Water on the floor after rainstorms - Higher utility bills without a clear explanation
Weatherstripping generally needs replacement every few years, but in a climate with Troy's UV exposure and temperature swings, the actual timeline varies. Visible wear is a more reliable indicator than any fixed schedule. inspect it at least once a year, ideally each spring.
The bottom seal is the most commonly replaced, and it's also the most DIY-friendly repair on a garage door. Here's a straightforward breakdown:
1. Open the door partway to access the bottom edge. 2. Slide the old seal out of the metal retainer channel. It usually slides out from one end. Old seals can be stubborn. steady, patient pulling works better than forcing it. 3. Clean the retainer channel thoroughly. Dirt and dried residue in the channel will prevent the new seal from seating properly. 4. Measure carefully and cut the new seal slightly longer than the door's width to account for temperature expansion. An accurate measurement ensures proper compression and prevents gaps. 5. Slide the new seal into the retainer from one end. Lubricating the retainer channel makes this easier. 6. Close the door fully and check that the seal contacts the floor evenly across the entire width with no visible gaps.
For side and top weatherstripping, the process involves removing the old strips from the door frame, measuring each section separately, cutting to size, and fastening with nails or screws with the door closed. The top seal goes on first, and side seals push up to meet it at the corners.
If your door is misaligned, extremely heavy, or has structural damage to the frame, professional installation is the better call. Poor alignment means even a new seal won't compress evenly and will wear out faster. Our frequently asked questions page covers more about when professional help makes sense for door repairs.
For Troy's climate, rubber is generally the most reliable choice for bottom and threshold seals. It holds up well under UV exposure, doesn't crack as readily in winter cold, and provides a consistent seal. Vinyl is another option. it's more affordable but tends to harden and crack faster when exposed to temperature swings and direct sunlight. Whatever material you choose, make sure the profile matches your retainer channel type before you buy.
If you're also thinking about whether your door material itself is contributing to weathering problems. for example, if you have a wood door that's absorbing moisture and warping. our material selection guide for homeowners walks through the trade-offs between steel, wood, aluminum, and fiberglass in plain terms.
Bottom seal replacements are a reasonable DIY project for most handy homeowners. But if you're dealing with a door that doesn't close evenly, a frame that's warped, seals that keep failing after replacement, or you just don't want to spend a Saturday on it, Troy Garage Doors can take care of it efficiently. Weatherstripping replacement is a quick service call that pays off immediately in comfort, protection, and lower energy bills. Schedule a visit and we'll assess your full seal system while we're there.
How long does garage door weatherstripping typically last in Troy's climate? It varies by material and location on the door, but a reasonable expectation is 2,5 years for the bottom seal and somewhat longer for side and top seals that don't contact the floor. Troy's summer humidity and UV exposure can shorten that lifespan. Visual inspection each spring is more reliable than going by a fixed replacement schedule.
Can worn weatherstripping cause my garage door hardware to rust faster? Yes, directly. Gaps in the seals allow humid outdoor air to flow freely into the garage. In Montgomery County's summers, that means consistently high moisture levels inside the garage, which accelerates rust and corrosion on springs, tracks, hinges, and any metal tools or equipment you store inside. A tight seal is one of the best things you can do for the longevity of your entire door system.
Is a threshold seal worth adding if I already have a bottom seal? In most cases, yes. especially if your driveway slopes toward the garage or if you've had water intrusion issues after heavy rain. The two seals work together: the bottom seal handles gaps between the door and the floor, while the threshold seal creates a raised barrier at floor level. Combined, they're significantly more effective than either one alone.