2026-06-04 7 min read A2Z Garage Doors
Weather stripping and seals are the unsung heroes of your garage door system. They stop drafts, keep insects out, and reduce your cooling costs during Riverside's brutal summers. If you're noticing warm air leaking into your garage or daylight creeping under the door, your seals are failing. A new bottom seal or threshold replacement typically costs $150 to $400 depending on your door's size, and the payback happens fast when your AC isn't working overtime.
Our desert climate is relentless. Summer temperatures regularly hit 105 degrees or higher. If your garage door seals are worn or missing, you're basically inviting that heat straight into your garage and the spaces attached to it. A failing bottom seal allows air infiltration that forces your HVAC system to compensate. Over a summer season, that adds up.
Weather stripping serves three core purposes: blocking heat transfer, preventing water intrusion during rare rain events, and stopping dust and pests from entering. Riverside sits in San Bernardino County where dust storms happen, and a degraded seal turns your garage into a dust collector. Beyond comfort, poor seals can damage stored items, tools, and vehicles.
Most homeowners don't realize that weather stripping fails gradually. The rubber or foam compresses over 3 to 5 years. You might not notice until your electric bill spikes or you spot daylight under the door in the morning.
Your garage door has seals in multiple locations. The bottom seal (also called a bottom astragal) is the most critical. This rubber strip runs across the bottom edge and makes contact with your concrete threshold as the door closes. When it wears thin or cracks, cold air, hot air, water, and pests all find their way in.
Side seals run along the left and right vertical tracks. They're usually smaller and made of foam or rubber. A damaged side seal won't cause as dramatic a draft as a failed bottom seal, but together with a worn threshold contact, they add up. Top seals exist too, though they're less prone to failure because the top of the door doesn't make contact with the ground.
The threshold itself is sometimes overlooked. It's the metal or rubber strip at the bottom of the opening where the door makes its seal. If your threshold is bent, cracked, or misaligned, even a brand-new bottom seal won't create a tight fit.
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A failing bottom seal or threshold doesn't just waste energy. Moisture can seep under the door during our occasional winter rains, leading to rust on the door's bottom edge and corrosion of the tracks. Insects and rodents exploit the gap. I've seen homeowners pay $800 to $1,200 for track and roller damage that could have been prevented with a $200 seal replacement.
If you're concerned about upfront cost, understand that this is genuine preventive maintenance. We've written about this before in our guide to garage door maintenance that helps you skip expensive fixes. The same principle applies here: small repairs now beat major ones later.
An energy audit estimate from a local HVAC contractor often reveals that 15 to 20 percent of garage temperature loss comes from a failing door seal. In Riverside, running your AC harder to cool a leaky garage adds $20 to $40 per month during summer months.
Replacing weather stripping and seals is straightforward work, but it requires the right parts and proper installation. The bottom seal must be cut to the exact width of your door. The threshold has to be properly seated and shimmed level. If it's not aligned, the new seal won't compress evenly, and you'll have a draft in one corner.
We recommend getting a free estimate before committing. Our team at Garage Door Riverside's weather stripping and seal services can inspect your door and threshold in person, identify what's failing, and give you a transparent price quote. No upsell, no hidden fees. We'll tell you if the threshold is salvageable or needs replacement.
For same-day or next-day service across Riverside and nearby areas, schedule a free quote with us. We keep common seal sizes in stock and can often complete the work the same day you call.
How long do garage door seals last? Most weather stripping lasts 3 to 5 years in Riverside's heat and sun. UV exposure and temperature swings degrade rubber faster than in cooler climates. Annual inspection during your maintenance routine catches wear early.
Can I replace the bottom seal myself? You can, but it requires removing the door's bottom section or lifting the door off its tracks. One mistake can damage the door or your garage structure. Professional installation ensures the seal compresses evenly and actually stops drafts.
What's the difference between a bottom seal and a threshold? The bottom seal is the rubber strip attached to the door's underside. The threshold is the fixed metal or rubber piece at the opening's base where the seal makes contact. Both must be in good condition for an effective barrier.
Why is my new seal still drafty? The threshold is probably bent or misaligned. A warped threshold prevents the seal from compressing fully. The concrete floor might also have settled or cracked. We inspect and correct alignment during installation.
Does weather stripping save money on energy bills? Yes. A proper seal typically reduces garage temperature swing by 5 to 10 degrees in summer and winter. For attached garages, that translates to 10 to 15 percent lower cooling and heating costs. Payback usually happens within one season in Riverside.