2026-03-23 6 min read
Walk into your garage on a January morning in Campton and you'll know pretty quickly whether your weatherstripping is doing its job. If there's a draft along the floor, a thin line of daylight visible under the door, or a puddle of snowmelt that came in from outside. your seals have failed and they're costing you money every single day the temperature sits below freezing.
Given that Campton's winters run from November through April with average January lows near 9°F and plenty of freeze-thaw cycles in between, a failed seal isn't a minor inconvenience. It's a real source of heat loss. especially for the many homes around Campton Hollow and Blair that have attached or semi-attached garages where cold air bleeds directly into living spaces.
Most homeowners think of weatherstripping as just the rubber strip at the bottom. In reality, a properly sealed garage door has four contact points:
- Bottom seal, The rubber or vinyl strip that compresses against the concrete floor when the door closes. This is the most commonly replaced piece and the first one to wear out. - Side seals (door stop weatherstripping), The strips along both vertical sides of the door frame that prevent wind and cold from entering along the edges. - Top seal, The horizontal strip across the top of the door opening. Often overlooked but critical for blocking drafts in older homes. - Section panel seals, On older sectional doors common in Campton's vacation cabins and 1970s,1990s colonial-style homes, the rubber inserts between door panels can crack and separate over time.
All four deserve attention during a seasonal inspection. You can review the full services we offer to understand what a complete tune-up covers.
The same freeze-thaw cycle that's hard on springs is equally hard on rubber and vinyl. Over time, this weatherstripping can become dry, brittle, and prone to cracking, or may fall out entirely due to wear and tear. Cold also makes the concrete floor shift slightly, which can create uneven contact that leaves gaps even when the seal itself looks intact.
For homes near the Mad River or in lower-lying areas of West Campton, spring snowmelt adds another layer of stress. water repeatedly saturating the bottom seal accelerates breakdown faster than normal wear alone.
For properties in higher-elevation areas near Waterville Estates or Meredith Road, wind is the bigger enemy. Even a small gap in the side or top seal allows cold air to funnel into the garage with surprising force on a windy February night.
Not all weatherstripping is created equal, and material choice matters a lot in a climate like Campton's.
Rubber is generally the best choice for cold climates. It stays flexible even as temperatures drop and conforms well to uneven floor surfaces, which is common on older concrete slabs. If you live in an area with freezing winters, look for rubber stripping that's specifically designed to stay flexible in cold temperatures.
Vinyl is less expensive but becomes stiffer in cold weather, which can reduce its effectiveness during exactly the months when you need it most. It's acceptable for the side and top seals, which don't flex as much as the bottom seal.
Foam compresses well and is inexpensive but wears out quickly under repeated contact with a concrete floor. It's better suited for panel inserts than for the bottom seal in a New Hampshire climate.
For the bottom seal specifically, look for a T-slot or U-shaped beaded style with a thick rubber bulb. these handle uneven concrete better than thinner flat seals, and they're easy to replace when the time comes.
You don't need any special tools for a basic inspection. Here's a quick five-minute check:
1. The light test. Close the garage door completely and turn off all interior lights. Look along the bottom, sides, and top of the door frame. Any visible daylight means a gap that cold air and moisture can exploit. 2. The feel test. On a cold or windy day, run your hand slowly along all four edges of the closed door. Any draft indicates a failed or missing seal. 3. Visual inspection of the bottom seal. Open the door and look at the rubber strip. Cracks, flat spots where the seal has compressed permanently, tears, or missing sections all mean it's time to replace it. 4. Check the floor contact. Close the door and look from the inside at the contact point between the bottom seal and the concrete. The seal should compress evenly across the full width. Gaps in the middle often mean the concrete has settled unevenly. a threshold strip can fill that gap without replacing the entire seal.
Replacing a garage door bottom seal is one of the more DIY-friendly garage door tasks. but it's worth knowing what you're getting into before you start.
Most sectional doors use a retainer track on the bottom panel that the seal slides into from one end. The process involves opening the door enough to access the bottom panel, sliding the old seal out of the retainer, cleaning the channel thoroughly, and sliding the new seal in. Lubricate the rubber with a few drops of dish soap and thread the edges into the weather seal track. it takes patience but no special tools.
The key things to get right: make sure the new seal matches your retainer type (T-slot, beaded, or bulb-style), and cut it precisely to the width of your door rather than leaving excess that folds at the edges.
For side and top seals, the job is even simpler. these typically nail or screw directly to the door stop molding. Take a look at our frequently asked questions for more detail on when DIY makes sense versus calling a professional.
If the retainer itself is bent, rusted, or missing sections. which is common on doors over 15 years old. replacement becomes more involved and that's where Garage Door Campton can help. A damaged retainer often means the seal won't seat properly no matter how new it is.
In a climate like Campton's, plan on inspecting seals every fall before the ground freezes. On average, bottom seals last 2,5 years in heavy-use New Hampshire conditions. shorter if the garage door is opened and closed multiple times daily, as is common with households that use the garage as their main entry point during ski season.
Side and top seals last longer. typically 5,10 years. but check them annually regardless. For homeowners in Laconia or Holderness who also use their garages as workshops or utility spaces year-round, the wear rate on all seals accelerates noticeably compared to seasonal vacation properties.
For a complete seasonal checklist that covers weatherstripping alongside your other hardware, the winter preparation guide on this site is worth bookmarking.
An uneven floor is common in older Campton homes where the concrete slab has settled over decades of freeze-thaw cycles. A standard T-slot seal may leave gaps in the low spots. Look for a thick bulb-style or U-beaded seal, which conforms better to irregular surfaces. For significant gaps, a rubber floor threshold bonded to the concrete can bridge the difference more effectively than any seal attached to the door itself.
Absolutely. Garage doors are often the largest uninsulated opening in a home, and gaps in the seals allow cold air to move freely into the garage and, in attached-garage homes, into the house itself. Properly sealed and insulated garage doors can help reduce energy loss significantly. which matters a lot during a Campton winter that can run four to five months of below-freezing temperatures.
The seals on the door (bottom seal, panel inserts) move with the door every time it operates. The seals on the door frame. the vertical and horizontal stops. are stationary and only compress when the door closes against them. Both need to be in good shape to create a complete seal. Replacing just one without checking the other often leaves gaps that defeat the purpose of the repair.