How to Stop Draft Under Your Garage Door in Covina
2026-07-16 7 min read A2Z Garage Doors
A customer called last Tuesday saying cold air was pouring under her garage door, and her energy bill had climbed $40 a month. She'd tried a rubber strip from the hardware store. It lasted three weeks. The real problem wasn't the product. It was that her original bottom seal had deteriorated, and no bandage fix was going to stop the draft until we replaced it properly.
A gap under your garage door isn't just uncomfortable. It lets in cold air in winter, hot air in summer, dust year-round, and sometimes rodents or insects. The culprit is almost always a worn bottom seal or threshold that's shrunk, cracked, or come loose from the frame. Fixing it means understanding what's actually failing and replacing it right.
Why Your Garage Door Has a Draft
The bottom seal on your garage door takes a beating. It compresses and decompresses thousands of times as the door opens and closes. Sun, rain, temperature swings, and salt air (if you're near the coast, like many Covina residents) all degrade rubber and vinyl faster than most homeowners expect.
Most bottom seals last 5 to 7 years before they start to shrink or crack. If yours is original and your home is ten years old or older, that draft is probably not a surprise. The rubber hardens. It loses flexibility. Eventually, it can't seal against the threshold anymore, and that's when air finds its way in.
The threshold itself can also warp or shift, especially in garages with concrete floors that heave slightly over time. Even a quarter-inch gap is enough to create a noticeable draft.
How to Identify a Bad Seal vs. a Bad Threshold
Stand inside your garage on a sunny day and look at the bottom of the closed door. Can you see light coming through? That's your answer. If you see daylight, you have a gap.
Next, run your hand along the bottom seal. Does it feel hard and brittle, or does it compress easily? Press the seal against the threshold. Does it make contact across the entire width, or does it rock back and forth?
A soft, flexible seal that makes full contact is working. A hard, cracked seal or one with visible chunks missing needs replacement. If the threshold itself is bent or cracked, that also needs attention. Often, both need replacing together to get a real seal that stops the draft.
**Need weather stripping & seals in Covina today?** Call (424) 581-0740. we cover same-day service across the area.
What a Proper Replacement Looks Like
Here's where honest pricing matters. A real bottom seal replacement takes 30 to 45 minutes. We remove the old seal (which is almost always glued or bolted on), clean the threshold, and install a new seal that's rated for your climate. In Covina, we typically use EPDM rubber or vinyl seals that handle our temperature swings and occasional moisture without degrading as fast as cheaper options.
The threshold gets checked and cleaned. If it's warped beyond a few millimeters, we recommend replacing it. If it's just dirty or slightly worn, cleaning and sealing it often does the job.
A quality seal costs between $150 and $300 for parts and labor, depending on your door's width and whether the threshold needs replacement too. That's not the cheapest option out there. But it's honest. And it stops the draft for 5 to 7 years, not 5 to 7 weeks. You can read more about weather stripping and seals cost in Covina if you want to see what other homeowners have paid.
DIY Temporary Fixes vs. Real Solutions
Rope caulk, foam tape, and rubber strips are fine for temporary gaps. They're not fine for a failed seal. They'll compress, fall off, or let air around the edges within weeks. And they're a pain to remove when you want a permanent fix.
If you're renting or in a pinch, temporary fixes work. If you own your home and plan to stay, a proper replacement saves money on heating and cooling within the first heating season. Learn more about when to replace weather stripping and seals for the full timeline.
Why Seals Matter Beyond Comfort
A draft under your garage door affects your whole home if your garage is attached. Conditioned air leaks out. Unconditioned air leaks in. Your HVAC system works harder. In summer, the heat creeps into the garage and radiates into the house.
Beyond energy, a draft invites pests. Insects and rodents can squeeze through gaps that seem impossibly small to us. A proper bottom seal and threshold are basic pest prevention.
For more on how seals fit into the bigger picture of garage door efficiency, explore garage door insulation in Covina to see how seals work alongside insulation.
Getting an Honest Estimate
Call Garage Door Company Covina or schedule a free quote to have someone look at your door in person. A real technician will check the seal, the threshold, and the door alignment. They'll tell you whether a seal replacement solves the problem or whether something else is causing the gap.
Don't guess. A misaligned door, bent frame, or broken bottom fixture can create a draft that no seal will fix. We'll identify the real issue and give you an honest cost before we touch anything.
Stop paying to heat or cool the neighborhood. A sealed garage door is a smart investment that pays for itself in energy savings and gives you peace of mind about pests and comfort.
Call (424) 581-0740 today or get a same-day estimate online. We serve Covina and the surrounding areas with honest pricing and real solutions.
Frequently Asked Questions
What's the difference between weather stripping and a bottom seal? Weather stripping typically refers to the side and top seals that run along the frame edges. The bottom seal is the horizontal strip at the base of the door. Both stop drafts, but the bottom seal takes the most wear because it compresses with every cycle.
Can I replace my bottom seal myself? You can if you're handy. The old seal usually pulls off or unbolts, and new seals come with adhesive or fasteners. The tricky part is aligning it perfectly so it compresses evenly. A misaligned seal leaves gaps. Most homeowners do better calling a pro.
How often do garage door seals need replacing? Quality seals last 5 to 7 years in Covina's climate. Cheaper rubber degrades faster. Sun exposure, temperature swings, and moisture all shorten lifespan. If your door is older than seven years and you feel a draft, replacement is overdue.
Will a new seal stop all drafts under my door? A good seal stops most drafts if your door is aligned and your threshold is straight. If the door frame is bent or the door sags, a seal alone won't fix it. That's why an honest inspection matters before you pay for anything.
How much does weather stripping replacement cost in Covina? Bottom seal and threshold replacement typically runs $150 to $300 for parts and labor. Side and top seals cost $100 to $200 more if needed. Get a free estimate to know your exact cost based on your door's condition.