2026-08-23 7 min read
A customer called last Tuesday complaining his garage was colder than his porch. We found the culprit right away: the bottom seal had shrunk away from the threshold, creating a gap wider than a pencil. That gap alone was pulling cold air into his space and spiking his heating costs. A failing bottom seal is one of the most overlooked maintenance issues we see in Mountlake Terrace homes, yet it's also one of the easiest to catch early.
Your garage door's bottom seal does heavy lifting year-round. It compresses and releases thousands of times as the door cycles up and down. In the Pacific Northwest, temperature swings and moisture accelerate wear. Rubber degrades fastest in cold weather, especially when it's exposed to direct rain and freeze-thaw cycles.
After about 5 to 7 years, the seal loses its flexibility. Instead of maintaining a tight fit against the threshold, it cracks, hardens, or simply peels away. You'll notice drafts first, then see daylight creeping under the door frame. By that point, you're losing heated air in winter and letting humid air seep into summer cooling.
The threshold itself can warp if the door's been misaligned or if water pooled underneath for too long. When the threshold shifts even a quarter-inch, the bottom seal can no longer make contact.
Look for visible gaps between the seal and the concrete floor. Run your hand along the inside bottom edge. If you feel cold air rushing in or notice light streaming through, replacement is overdue. Water stains on the garage floor directly below the seal also signal failure.
Some seals wear unevenly. One side might be compressed while the other has lifted. This usually means the door frame is slightly out of square or the seal was installed incorrectly. That's why we always inspect alignment during our assessment.
If you've already spotted warning signs, check our guide on the three warning signs you need seal replacement for a detailed walkthrough.
**Need weather stripping & seals in Mountlake Terrace today?** Call (425) 696-7084. we cover same-day service across the area.
Most homeowners expect to pay between $150 and $350 for a standard bottom seal replacement, depending on door width and seal type. A wider commercial door runs higher. The labor is straightforward when the frame is square, but if the threshold needs correction or the frame has shifted, you'll add time and cost.
Don't confuse the bottom seal with the side seals and top header seal. Those require separate work. Our full cost breakdown explains what you'll actually pay for complete weather stripping & seals in Mountlake Terrace.
Getting an accurate estimate is critical. We measure the door opening, inspect the threshold, and check alignment before quoting. That way, no surprises when we finish.
You can buy replacement seal material online for $30 to $80 and attempt it yourself. The trick is removing the old seal cleanly, cleaning the recess, and stretching the new seal evenly across the width without twisting it. Most homeowners skip the alignment check, leading to uneven compression or gaps within months.
A professional brings laser levels, proper removal tools, and experience with the dozens of seal profiles used across different door brands. Garage Door Mountlake Terrace has installed and replaced seals on everything from standard residential doors to custom installations. We get it right the first time, which saves you from a second call.
Cold air pouring into your garage is money pouring out. If you're noticing draft, visible gaps, or water pooling under the door, schedule a free quote today. We can often dispatch a technician same-day to assess the situation and discuss repair options on the spot.
Call us at (425) 696-7084 or use our online booking to lock in a time that works. We'll check your seal, threshold, and frame alignment so you know exactly what needs fixing.
Don't wait for winter to peak. A working bottom seal keeps your space comfortable, protects your belongings from moisture, and cuts your energy bills. Browse our full weather stripping and seals services to see what else we cover.
How long does a garage door bottom seal last? Most quality seals last 5 to 7 years with normal use. Northwest weather, especially freeze-thaw cycles, accelerates wear. Inspect annually and replace the moment you spot cracks, hardening, or gaps.
Can I replace just the bottom seal, or do I need all seals replaced? You can replace the bottom seal alone. However, if the side seals or top header seal show similar wear, we recommend replacing the whole set at once for consistent insulation and a cleaner finished look.
What's the difference between a bottom seal and a threshold? The threshold is the metal or concrete beam where the seal sits. The seal is the rubber or silicone strip that compresses against the threshold. If the threshold is damaged or warped, the seal won't work properly even if it's new.
Will a new seal stop all drafts and water? A properly installed seal stops the vast majority of drafts and water infiltration at the bottom. Minor air movement is normal, but visible gaps and puddles should stop completely. Misalignment elsewhere on the door can still cause problems.
How much does weather stripping and seals cost if I need the whole package? Bottom seal, side seals, and top header seal together typically run $250 to $600 depending on door size and frame condition. Get a professional estimate because frame repairs or alignment work can add to the final cost.