2026-04-27 6 min read
With Cascadia averaging around 61 inches of rain per year. well above the national average of 38 inches. and precipitation spread across roughly 167 days annually, water management around your home isn't optional. It's constant. One of the most overlooked entry points for rain, cold air, and even small animals is right at the bottom and sides of your garage door.
Weatherstripping is the rubber or vinyl seal that lines the perimeter of your garage door. It compresses when the door closes, blocking the gap between the door and the frame or floor. When it's working correctly, you barely notice it. When it's cracked, compressed flat, or missing sections, you'll start noticing it in your energy bills, in puddles on the garage floor after heavy rain, and in the cold drafts that make the garage. and often the rooms above it. harder to keep comfortable.
For homeowners along the Highway 20 corridor between Cascadia and Sweet Home, this isn't a minor cosmetic issue. The combination of constant rain, mild freeze-thaw cycles in winter, and the humidity that rolls in off the South Santiam River means weatherstripping takes more abuse here than it would in a drier climate.
Most people think of weatherstripping as just the rubber strip at the bottom of the door. There are actually four distinct sealing points:
This is the most visible and most frequently damaged piece. It's a rubber or vinyl strip attached to the bottom edge of the door that flattens against the floor when the door closes. Uneven concrete, cracked slab edges, and general wear cause this seal to lose its shape. A compromised bottom seal is usually the reason you see water pooling inside the garage after a heavy Oregon rainstorm.
Stop molding runs vertically along both sides of the door frame. It creates a seal between the door panel and the frame when the door is fully closed. Over time, it can pull away from the frame or compress into a shape that no longer seals properly.
The horizontal seal across the top of the door is often overlooked because it's hardest to see. It prevents rain from running down behind the door panel. which matters a lot when you're dealing with the kind of sustained, sideways-driving rain that comes in off the Cascades in fall and winter.
On sectional doors, the horizontal joins between door panels have small vinyl or rubber inserts that reduce air and moisture infiltration through the gaps. These degrade slowly and are easy to miss during casual inspections.
You don't need a professional to check these. Walk through this list on a dry day:
- Water on the garage floor near the door after rain. especially along the bottom edge or corners - Visible daylight around the door edges when the garage is dark inside - Cold drafts noticeable near the door, especially on the wall or ceiling above a finished garage - Cracked, brittle, or flattened rubber that doesn't compress and spring back when you press it - Gaps between the bottom seal and the floor when the door is fully closed - Evidence of mice or insects entering the garage. a gap that lets in a draft can also let in small pests
If you're also noticing issues with your door's operation. sticking, uneven movement, or noisy operation. it's worth checking whether moisture infiltration has affected related hardware. Our roller replacement guide walks through how to spot wear on rollers, which moisture accelerates significantly.
The bottom seal on most sectional doors is a genuine DIY repair. The seal slides into a retaining channel on the bottom of the door and can be replaced without special tools. just patience and the right replacement material. Measure the width of your door and buy a piece slightly longer than needed; you can trim it to fit. T-style and T-end bulb seals are the most common types for residential doors in this region.
Side and top seals are also manageable for a confident DIYer. The existing molding is usually nailed or stapled to the frame. Remove it carefully, clean the surface, and install new foam-backed or rubber-backed stop molding. Make sure the new seal compresses slightly when the door closes. it should create light resistance, not bind the door.
For panel seals, if sections of the insert are missing or severely cracked, replacement pieces are available from most garage door suppliers and press into the existing channel.
If your door frame itself shows signs of wood rot or water damage. which is genuinely common in older homes in this part of Linn County given the persistent moisture. that's a job for a professional. Compromised framing affects the fit of the entire door, not just the weatherstripping, and no amount of new seal material will compensate for a warped or rotted frame. Check our services page to see what a professional inspection of your door system covers.
Not all weatherstripping holds up equally well in wet climates. Here's what to look for when buying replacement seals in the Cascadia area:
- EPDM rubber is highly resistant to moisture, UV exposure, and temperature cycling. a strong choice for Oregon's conditions - Vinyl is affordable and adequate for moderate climates but can stiffen and crack in cold temperatures, which matters during Cascadia's winter freeze-thaw cycles - Foam-backed rubber works well for side and top seals where compression fit matters more than abrasion resistance
Avoid cheap foam-only seals for the bottom of the door. They compress permanently within one season in a high-use garage.
In most climates, weatherstripping lasts 5,10 years. In Cascadia's environment. 61 inches of annual rainfall, regular moisture exposure, and temperature swings. plan to inspect it every fall before the rainy season and every spring. Replacing bottom seals every 3,5 years is reasonable in this climate, especially if the garage sees regular vehicle traffic.
Homeowners in Albany and Corvallis, with slightly less rainfall exposure, might stretch that to 5,7 years. But if you're right in the canyon near the South Santiam, don't push it.
Cascadia Garage Doors can handle a full door perimeter seal replacement if you'd rather have it done right the first time. or if the frame and hardware need attention beyond what weatherstripping alone can fix. You can also review our post on preparing your garage door for storm season for additional steps to take before fall rain arrives. Reach out through our contact page to schedule a service call.
Q: How do I know if my bottom seal is the right size for my garage floor? A: The bottom seal should compress slightly and create uniform contact across the entire width of the door when closed. If you see light under any part of the door, the seal either needs replacement or your floor has an uneven section that requires a different seal profile. T-style adjustable seals can accommodate minor floor irregularities.
Q: Can worn weatherstripping affect my energy bills? A: Yes, noticeably. An attached garage with a compromised perimeter seal allows cold, damp air to enter, which affects the temperature of adjacent living spaces. In Cascadia's wet winters, this also means elevated humidity inside the garage, which accelerates rust on tools and corrosion on door hardware.
Q: Is there a best time of year to replace garage door weatherstripping in Oregon? A: Late summer or early fall. before the rainy season begins. is ideal. You get dry weather to work in, and the new seals are in place before the heaviest rainfall arrives. Avoid replacing rubber seals in cold temperatures below 40°F, as cold rubber is harder to work with and may not seat properly.