2026-03-28 7 min read
If you've lived in Chehalis for more than one rainy season, you already know what November feels like. The skies open up and don't really close again until July. In fact, Chehalis averages over 50 inches of rain annually. well above the national average. and November alone can bring nearly 8 inches of precipitation in a single month. For your garage door, that kind of sustained moisture exposure isn't just an inconvenience. It's a slow, steady attack on your seals, springs, panels, and opener electronics.
The good news is that most of this damage is preventable with the right weatherproofing strategy. Here's a practical, Chehalis-specific look at what to inspect, what to replace, and when to call a pro.
Chehalis sits in the heart of Lewis County, nestled between the Chehalis River valley and the foothills leading toward the Cascades. The geography funnels moisture-laden air straight into the area, and the temperature pattern. cool wet winters followed by a dry summer. creates a damaging cycle for rubber, metal, and wood components alike.
The repeated wet-dry cycling causes rubber weatherstripping to compress, harden, and crack. UV exposure during our brief dry summers degrades the material further, so by the time October rolls around, many seals that looked fine in August are already brittle and gapped. Up in Olympia and Tumwater, garage door technicians see the same pattern. the seals fail silently all summer and homeowners don't notice until water is pooling inside the garage in November.
For homes in Chehalis's older residential neighborhoods. many featuring two- and three-bedroom homes built around the 1980s. the original weatherstripping is likely decades past its useful life and well overdue for replacement.
The bottom seal (also called the door sweep) is your first line of defense. It presses against the concrete floor every single time the door closes. Over time, it flattens out and no longer creates a watertight barrier.
Here's a quick test: close your garage door on a dollar bill and try to pull it free. If it slides out with little resistance, your seal is no longer doing its job. For our climate, EPDM rubber bottom seals are the preferred choice. they remain flexible even in cold temperatures and hold up to continuous moisture exposure far better than standard vinyl.
If you're dealing with an uneven concrete floor (common in older Chehalis homes where settling has occurred), a wider 4-inch seal can help bridge small gaps that a standard seal can't close. Before you buy, check whether your door uses a T-style retainer channel or requires an adhesive-backed seal. they're not interchangeable.
Our full services page covers bottom seal replacement if you'd rather have a professional handle the measurement and installation.
The foam or rubber strips running along the door frame's sides and top are often the last thing homeowners think about. until they notice daylight (or a draft) peeking through. Walk around the outside of your closed door on a sunny day. If you can see light around the edges, water can get through too.
Press your finger into the existing stripping. If it feels hard, crumbles slightly, or has pulled away from the frame, it needs replacing. For Pacific Northwest conditions, look for EPDM or vinyl stripping rated for continuous moisture exposure. Foam strips are cheaper but rarely survive more than a couple of seasons in our climate.
For a deeper look at how door alignment affects seal performance, check out our guide on track alignment and its effect on your door system.
A threshold seal is a rubber or vinyl strip that adheres directly to the garage floor beneath the door, rather than to the door itself. It creates a second layer of protection and is particularly useful if your concrete floor has settled unevenly. In Chehalis, where older homes often have garage slabs that have shifted slightly over the decades, a threshold seal can eliminate gaps that a bottom sweep alone can't address.
Threshold seals bond to concrete with adhesive and can typically be installed by a homeowner in under an hour. They're worth every dollar, especially if you store tools, firewood, or anything that rust or mold can damage.
Timing matters. The window between late summer. when Chehalis gets its driest stretch in July and August. and the arrival of the fall rains in October is ideal for weatherproofing work. Adhesives cure better in dry conditions, and you'll actually be able to spot gaps and worn areas in decent light rather than during a downpour.
If you've already missed that window, don't wait another full year. A mid-winter inspection is still worth doing. Water damage to drywall, stored belongings, and garage floor coatings can easily reach into the thousands. Compare that to the cost of a new seal and an hour of work.
For questions about whether your current setup needs simple maintenance or a full inspection, reach out to our team directly. we're local and we know what these homes need.
In our wet climate, plan on inspecting your seals every fall and replacing them every three to five years. High-quality EPDM rubber lasts longer than foam or basic vinyl, so the upfront cost is worth it.
Possibly, but a 4-inch-wide bottom seal or a threshold seal bonded to the floor will do a much better job of closing irregular gaps. Both options are available and can be professionally fitted to your specific door and floor combination.
Yes. Moisture seeping past failed weatherstripping can reach your opener's circuit board and safety sensors, causing short circuits and premature failure. Protecting your seals is one of the most cost-effective ways to extend the life of your entire system. including the opener. For more on protecting your garage electronics, see our post on surge protection for your home and garage.