2026-08-19 6 min read
Most homeowners don't think about their garage door until something breaks. But weather stripping and seals are the silent workhorses that keep cold air out, your heating bills reasonable, and pests from finding a way inside. After 15 years on the trucks here in Cerritos and across Long Beach, I've seen countless homes lose hundreds of dollars a year because the bottom seal had cracked or shrunk. This guide walks you through what to watch for and when to call in a professional.
Your garage door has multiple seal points. The bottom seal (also called a bottom astragal or threshold seal) runs along the base of your door and absorbs the wear from repeated opening and closing. Side seals frame the left and right edges, and a top seal sits where the door meets the header. Together, they create a tight envelope that blocks wind, rain, dust, and unwanted pests. See our guide on essential garage door maintenance tips for homeowners.
Most seals are made from rubber or EPDM (ethylene propylene diene monomer), materials that expand and contract with temperature shifts. Here in Southern California, we don't face brutal winters, but our coastal breezes and occasional cold snaps still exploit worn seals. When rubber hardens or cracks over time, typically after 5 to 7 years of regular use, drafts appear. You'll feel them first.
Cerritos sits in the South Bay, where salt air from Long Beach and marine layer moisture can age rubber faster than in inland areas. Your garage door gets hammered by humidity and temperature swings that most homeowners don't realize are wearing down the seal material. Add in the fact that many garages in Cerritos aren't conditioned spaces, and losing heat or cool air through a damaged bottom seal really stings when the utility bill arrives. Read about garage door openers in cerritos: belt vs. chain vs. smart models.
A cracked or missing bottom seal also invites water penetration during our occasional heavy rains. I've pulled up to homes where water pooled near the garage floor because the threshold had failed. That's not just a comfort issue; standing water attracts pests and can damage stored items or concrete.
If you notice a draft coming from under your garage door or see daylight peeking through, worn seals are the likely culprit. Check our essential garage door maintenance tips for a full seasonal checklist.
Here are the red flags I look for on every service call:
Visible cracks, tears, or hardening. Run your hand along the rubber. It should feel pliable, not brittle.
Daylight visible around the edges. If you can see light between the door and frame from inside the garage, air is leaking.
Water or insects inside. A leak near the base or finding spiders and ants in the garage points to seal failure.
Higher energy bills. If your heating or cooling is running harder, poor seals are part of the problem.
Age. If your door is 7 to 10 years old and you've never replaced seals, they're due for inspection.
The good news is that weather stripping and seal replacement costs less than most people expect. A basic bottom seal runs between $150 and $350 for parts and labor in Cerritos, depending on your door size and seal type. Getting a free estimate takes 15 minutes.
**Need weather stripping & seals in Cerritos today?** Call (562) 784-8011. we cover same-day service across the area.
Not all seals are created equal. The most common option is a rubber bottom seal that fits into a track at the base of your door. It's affordable and does the job well for typical residential use. Some high-end garage doors use a full threshold gasket system that seals all four sides in one integrated unit, reducing drafts even further.
If you're replacing seals on an older door, verify the manufacturer's specs. A mismatch means the seal won't seat properly. When we do an inspection, we measure and confirm compatibility before quoting a replacement. That's the kind of detail that separates a DIY disaster from a long-lasting repair.
For homeowners considering upgrades, pairing new seals with an efficient opener can cut garage energy loss significantly. See our guide to belt vs. chain vs. smart garage door openers if you're thinking about a larger project.
You can replace a bottom seal yourself if you're handy. The seal typically slides out of a track and clips back in. But I see people waste time and money getting it wrong. Improper installation leaves gaps that let drafts right back in. If your door is still under warranty, DIY work can void it.
Here's my honest take after 15 years: if the seal is cracked, your door's springs are in good condition, and you just need new rubber, you might DIY and save $100 or so. But if you notice springs look worn or the door doesn't operate smoothly, call a pro. You don't want to be alone in the garage if something goes sideways. We can handle the seal replacement, inspect your garage door springs, and test the whole system in one visit.
Once you've got fresh seals installed, keep them clean. Dirt and salt residue build up along the bottom, especially near the threshold. Rinse the base of your door monthly with a garden hose and mild soap. Wipe it dry.
Avoid slamming the door open or closed. Smooth, even operation reduces strain on seals. If your door jerks or hesitates, springs or the opener may need attention.
During Cerritos's rare cold spells or humidity spikes, give seals an extra visual check. Rubber can harden faster in temperature extremes. Catching a crack early means a simple replacement instead of water damage inside your garage.
Don't ignore small gaps. Seals degrade in stages. Once you see daylight, replacement is coming soon anyway. Schedule a free quote and let us assess the situation. We'll give you a straight answer on cost and timing.
Contact Garage Door Cerritos if seals are cracked, if you feel consistent drafts, or if you're not confident removing the old seal yourself. We offer same-day estimates and same-day service in most cases. Our technicians will check the entire door assembly, not just the seal, to make sure nothing else is failing silently.
Preventive maintenance saves money over time. New seals cost a few hundred dollars. Water damage or a failed spring costs a lot more. Reach out today at (562) 784-8011 or contact us online to book your inspection.
The small investment in good seals pays dividends in comfort, lower utility bills, and peace of mind. Don't wait until drafts become a real nuisance.
How long do garage door seals last? Most rubber seals last 5 to 7 years with normal use. Coastal areas like Cerritos, where salt air and humidity are higher, may see faster degradation. Inspect seals annually to catch wear early.
Can I replace the bottom seal myself? Yes, if you're comfortable with basic tools. The seal usually slides into a track and clips in place. Watch the manufacturer's video first. If springs look worn or the door doesn't operate smoothly, hire a pro to avoid injury.
What's the cost to replace weather stripping in Cerritos? A bottom seal replacement typically runs $150 to $350 in labor and materials, depending on door size and seal type. Full four-side seal replacement costs more. Request a free estimate for an exact quote.
Does a cracked seal really increase my energy bill? Yes. A gap in your bottom seal or side seals lets conditioned air escape. In summer or winter, your HVAC system works harder to maintain temperature. Sealing the gap can reduce garage energy loss by 10 to 20 percent.
What's the difference between weather stripping and a threshold seal? Weather stripping is the rubber strips on the sides and top of the door. The threshold seal is the bottom piece. Both serve the same purpose: blocking drafts, water, and pests. A complete seal system uses all three.