Garage Door Weatherstripping Replacement? Stop Drafts, Water & Heat Loss Fast
If your garage feels cold in the winter, hot in the summer, or you’re noticing water, dirt, or pests getting in, your weatherstripping is likely worn out. The bottom seal and perimeter seals are designed to keep the elements out, but over time they crack, shrink, or pull away. The good news is many garage door weatherstripping issues are simple DIY fixes 1but some require proper fitting and installation to seal correctly.
Frequently Asked Questions- Garage Door Weatherstripping
Why is my garage door letting cold air in?
Worn or damaged weatherstripping is the most common cause. Gaps along the bottom or sides allow outside air to enter.
How do I know if my garage door seal needs replacing?
Look for cracks, brittleness, visible gaps, or light coming through when the door is closed.
Why is water getting into my garage under the door?
A flattened or damaged bottom seal can no longer create a tight seal against the floor, allowing water to seep in.
Can I replace garage door weatherstripping myself?
Yes, bottom seals and side seals can often be replaced as a DIY, as long as the track and retainer are in good condition.
What type of garage door seal do I need?
It depends on your door type. Common options include T-style bottom seals, bulb seals, and brush or rubber side seals.
Why is my garage still drafty after replacing the seal?
The issue may be uneven concrete, improper sizing, or gaps along the sides and top not just the bottom seal.
How long does garage door weatherstripping last?
Typically 3–7 years in Canadian climates, depending on weather exposure and material quality.
Can weatherstripping help keep my garage cool in summer?
Yes. Proper sealing helps block hot air from entering and improves overall temperature control.
Watch this quick DIY guide on replacing and checking your garage door weatherstripping:
DIY if:
- the bottom seal is cracked or worn
- you can slide the old seal out of the track
- the side seals are loose or peeling
- you’re dealing with small drafts or minor gaps
Call a pro if:
- the seal won’t slide out or is stuck in the retainer
- the retainer track is bent or damaged
- the door doesn’t sit evenly on the ground
- water still enters after replacing the seal
- you need a proper custom fit for uneven floors
Safe DIY steps Garage Door Weatherstripping
Inspect the bottom seal
Close the door and check for gaps, cracks, or areas where light is visible.
Remove the old weatherstrip
Slide the old seal out from the retainer track. If it’s stuck, gently loosen it without damaging the track.
Clean the track
Dirt and debris can prevent a proper seal. Wipe down the retainer before installing the new strip.
Install the new seal
Slide the new weatherstrip into place and ensure it runs evenly across the bottom.
Check side and top seals
Look for gaps along the frame. Replace any worn or hardened perimeter seals.
Test the seal
Close the door fully and check from inside for light, airflow, or uneven contact with the ground.
Service Area
Direct Doors helps homeowners across Vaughan, Brampton, Mississauga, Richmond Hill, Markham and surrounding GTA communities diagnose and repair garage door closing issues, including sensor problems, opener faults, and recurring safety-beam errors.