Seattle's mild, damp climate wears down garage door seals fast on homes built between 1962 and 2001. Here's what to check and what actually drives the cost.
Related: Garage Door Service · areas we serve.
What the Weather Here Does to It
Seattle sits in a mild climate band with some freeze risk, not the deep freeze-thaw swings that split rubber seals overnight in colder states. What we get instead is steady, low-grade moisture: damp air, drizzle, and long stretches where the door face never fully dries out. That slow soak is harder on a seal than one hard freeze. Vinyl and PVC bottom seals stiffen and crack from repeated wetting and drying, and the flexible astragal along the floor loses its grip on the concrete over years, not weeks.
Most of the housing stock in this service area went up between 1962 and 2001, with the median install year sitting around 1982. A door from that era, or an original seal kit that's never been swapped, has been through four decades of Puget Sound damp. Wind direction matters too - homes with more exposure toward the water, like those closer to Bainbridge Island or Mercer Island, take more wind-driven rain against the door face than a garage tucked into a more sheltered inland block. That exposure shows up as a draught line along the bottom corners before it shows up anywhere else.
What to Check
Start at the bottom seal. Press a hand along the floor where the door meets the slab - if you feel air movement or see daylight at the corners, the astragal has flattened or torn and isn't doing its job. Check the vinyl for cracking or a permanent set where it's been compressed for years; once it stops springing back, it stops sealing.
Next, run your hand along the side and top weatherstrip, the U-shaped channel the panel edges sit into. On doors from the 1980s and 90s stock common across this area, that channel is often original and brittle, especially on the side that gets more sun or more direct rain.
Look at the corner brackets and the header seal too. A gap at the top corner lets in more draught than most owners expect, and it's easy to miss because it's above eye level. Finally, check whether the door still sits flat when closed - a door that racks slightly on its tracks will never seal evenly no matter how new the weatherstrip is, and that's a track or hardware issue, not a seal issue.
What It Costs
We don't have a published price list to point you to here, and giving you a number without seeing your door would be a guess dressed up as a fact. What drives the cost on a seal job is mostly the door's age and design: a standard bottom astragal swap is a different job than replacing brittle top-and-side weatherstrip channel on an older steel or wood panel door, and a door that's racked on its tracks needs that fixed first or the new seal won't hold anyway.
Honest limitation: if your door is from the older end of the 1962‑2001 range and the seals have never been touched, a seal swap alone sometimes isn't the fix - the tracks and rollers underneath may be worn enough that draughts keep coming back until those get addressed too. We'd rather tell you that up front than sell you a seal kit and have you call again in six months.
What Is Going On
The pattern we see across this service area - 124,160 owner-occupied houses, most built during that 1962‑2001 stretch - is seals that were fine for the first fifteen or twenty years and then quietly gave up. Nobody notices a seal failing in real time. It's gradual: a slightly higher heating bill, a cold patch near the garage wall, then one wet week where you can actually see water creeping under the door.
Because the climate here is mild with only occasional freeze, the failure mode isn't dramatic. Seals don't split in a cold snap the way they might elsewhere. They just harden, shrink slightly, and pull away from the slab a few millimeters at a time. By the time it's visible, it's been happening for a couple of seasons already.
Across the named areas we serve, from the wind exposure near Magnolia's bluff to lower, more sheltered pockets further from the water, the rate of wear varies, but the underlying cause is the same: decades-old vinyl doing a job it wasn't built to do this long.
Questions, answered
Why does my garage door let in a draught even though nothing looks broken?
Seals often look intact but have lost their flexibility. Vinyl that's been compressed against the slab for years takes a permanent set and stops springing back to fill gaps, especially in a damp climate like ours where the material never fully dries out between rain spells.
Is a seal replacement a DIY job?
The bottom astragal is often manageable for a handy owner - it's a track-fed strip that slides out and back in. Side and top weatherstrip channel is fussier, and if the door is racked on its tracks, replacing seals alone won't fix the draught.
How do I know if it's the seal or the tracks?
Close the door and check if it sits flat and even all the way across. If one side sits higher or there's a visible gap that isn't uniform, the tracks or rollers are likely out of alignment, and a new seal won't hold evenly until that's corrected first.
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