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Yes, this is an entire blog about weather stripping.
No, it is not the most fascinating topic, but we didn’t come here for fascinating, we came here to solve your door problems. Don’t trust that I can make it somewhat interesting? Head to the quick fire FAQ section below for fast answers to your door seal questions.
While not the most glamorous part of a door system, weather stripping matters, and maintaining it before it turns cold is key. There are always warning signs to watch for: a small draft in January, a line of dust along the garage floor after a windy day, or even more insects than usual finding their way inside over the summer. And if you live in the southern Alberta prairies, it might be something with a little more urgency: a rattlesnake that found the gap under your garage door and decided to wait out the heat in splendor (lookin’ at you, Ranchlands, Redcliff, and the west end of Lethbridge.)
Now, weather stripping is not a bug- and snake-proof force field, and we are not promising that a new seal stops every creepy crawlie in Southern Alberta. But gaps beneath garage doors create easy access points for all kinds of unwanted visitors (and unwanted problems), and the fewer invitations your garage sends out, the better.
When it comes to maintaining your weather stripping, here is what to look for and what to do about it.
What Garage Door Weather Stripping Actually Does
A garage door has four sealing points: the bottom seal, the two side seals running up the vertical edges of the door frame, and the top seal across the header. Together they form a complete barrier between the inside of the garage and everything outside it.
It works exactly like the seals around your front door, your windows, that fancy glass shower door. When everything is working properly, that barrier keeps out wind, water, dust, insects, rodents, and extreme temperatures. It also plays a real role in energy efficiency: a properly sealed door makes a measurable difference in how hard your heating or cooling system works, particularly in an attached garage or a heated shop.
In our climate, the seals take a beating from both ends of the thermometer. Chinook cycles push rubber through rapid expansion and contraction. UV exposure in a Medicine Hat summer is intense. Freeze-thaw cycling through spring and fall dries out rubber faster than in milder regions, and in years that aren’t like this one, the dry prairie air sucks the will to live out of pretty much everything, your seal included. Most weather stripping has a reasonable service life but it does not last forever.
Here is the fastest and most reliable way to identify a sealing problem.
Visual Inspection
Look at all four seals closely. Healthy weather stripping is flexible, consistent in shape, and makes full contact with the surrounding surfaces. Replace it if you see:
• Cracking or splitting along the length of the rubber
• Sections that have hardened and lost their flexibility (stiff or brittle vs pliable)
• Visible gaps where the seal is pulling away from the door frame or the floor
• Flattened sections that no longer spring back into shape when compressed
• Chunks missing entirely, particularly on the bottom seal
• Mold or significant discolouration, suggesting moisture has been getting past the seal consistently
The Hand Test
On a windy day, run your hand slowly along the perimeter of the closed door from inside the garage. You will feel air movement at any gap. Pay particular attention to the bottom corners, which are the most common failure points on both the bottom seal and the side seals.
Signs Inside the Garage
Sometimes the seal looks okay but the evidence inside tells a different story:
• A line of fine dust or debris along the base of the door after wind events
• Noticeably more insects inside in summer than in previous years
• Water stains or puddles near the door after rain
• A garage that is harder to heat or cool than it used to be
• Any evidence of rodents or wildlife that have made their way inside
DIY or Call a Professional? Here Is How to Decide
Weather stripping replacement is generally one of the easiest tackle-it-yourself door projects. That said, there are some situations where professional input may be warranted.
Bottom Seal: Usually DIY Friendly
The bottom seal takes the most abuse of any seal on the door: mechanical wear from opening and closing, contact with ice and snow, and the full force of anything that blows under the door, pest nibbles. On most doors, replacement involves sliding the old seal out of a retainer channel in the bottom bracket and sliding the new one in. The main things to get right: choose the correct seal profile for your retainer (T-style, T-end, and beaded are the most common. Take the old seal to the store or look up your door model before buying.) and confirm the new seal is the correct width for your opening.
If the retainer channel itself is bent, significantly rusted, or damaged, that changes the job. Call us at that point.
Side and Top Seals: Depends on the Door
Side and top seals are typically nailed or stapled to the door stop trim and can be pried off and replaced with new rubber-backed seal material. The challenge is achieving even compression all the way up and down the door edge. Too tight creates resistance on the opener, too loose and that brand new stripping will not seal properly. On doors that are slightly out of square, getting consistent contact across the full height of the door takes patience. For most straightforward residential installations this is manageable. For commercial doors, oversized openings, or anything showing alignment issues, a professional installation gives a better result.
A Note for Commercial and Agricultural Doors
The same principles apply to commercial and acreage doors, and the stakes are often higher. Large shop doors and commercial bays face more wind exposure, larger openings, more dust, more vehicle traffic, and more frequent operation. Even a small gap on a large door allows significant amounts of dirt, snow, water, or pests into the building. When that shop space houses expensive equipment and inventory, maintaining seals quickly becomes a practical risk reduction requirement.
When to Stop and Call Align Doors
Weather stripping replacement is maintenance, not mechanical repair, but there are situations where the seal problem is a symptom of something bigger. Call us if:
• The bottom seal keeps failing in the same spot. This can indicate the door is hitting the floor unevenly due to a track alignment or spring balance issue.
• You replace the seal but still see light or air gaps. The door frame may be warped or the door may be out of square.
• The retainer channel for the bottom seal is bent or damaged.
• You are working with a commercial door, an oversized opening, or a door already showing other signs of wear.
• You are not comfortable with the job and want it done right the first time.
Quick Answers to Common Questions
How long does garage door weather stripping last?
Most weather stripping lasts several years, but lifespan varies depending on environmental factors, door usage, and material quality. In Southern Alberta's climate, plan to inspect it annually and replace it as needed rather than on a fixed schedule.
Can you replace garage door weather stripping yourself?
Usually, yes, especially the bottom seal. Side and top seals are also manageable on straightforward installations. When in doubt, call a professional.
Will new weather stripping keep mice out of my garage?
It helps significantly. Properly installed weather stripping eliminates one of the most common entry points for mice and other small pests. Pair this with pest management strategies if you know they’ve already found their way inside.
Does weather stripping help with garage insulation?
It complements insulation by reducing air leakage around the perimeter. It does not replace insulation, but proper seals improves the performance of an insulated door noticeably.
What is the easiest way to check if my garage door seals are failing?
Close the door, turn off the garage lights during daylight hours, and look for light coming in around the edges or bottom. Feel for drafts. Any visible daylight or noticeable draft means there is a gap worth addressing.
A Small Fix That Makes a Big Difference
Weather stripping is one of the least expensive maintenance items on a garage door system and one of the hardest working. A door that seals properly keeps your garage cleaner, more comfortable, and better protected year-round. (And here in the south, keeps the slithering sneaks out too).
If you are not sure whether your seals are doing their job, the listed tests take two minutes. If you find a problem and want help with the fix, give us a call. We service residential and commercial clients throughout Medicine Hat, Southern Alberta, and Saskatchewan, and we will help ensure your door is sealed properly and ready for whatever the prairies throw at it.
Call us at 403-952-6127 or visit aligndoors.ca.
Precision You Can Trust. Excellence You Can See.
