Why Your Garage Door Lets the Cold In

By Cottage Grove Garage Door Pros · Published October 20, 2026 · Updated October 28, 2026

Doing Nothing For Now

It's easy to let a drafty garage door sit. You notice the cold air pooling near the floor in January, you throw a towel at the gap, and you move on. Most houses in Cottage Grove were built somewhere between 1956 and 2002, with a lot of that stock landing around the mid-1970s, which means the bottom seal on your door is probably the second or third one that's ever been on there - vinyl doesn't last fifty years, even if the door above it does. Waiting isn't free. A gap under the door doesn't just let in cold air; it lets in meltwater, salt off your tires, and enough debris over a winter to jam a track. The seal itself is a cheap part. What it's protecting - the bottom panel, the track alignment, whatever's stored against that wall - is not. If you can see daylight under the door right now, that's not a cosmetic problem, it's an open invitation for the next few months of weather.

What Is Going On

The bottom seal is a strip of rubber or vinyl set into a track along the base of the door, and it's doing the only waterproofing and air-sealing work most garage doors have. On a house from the 1960s-70s era, which describes a large share of the stock across this area, that track itself has often warped slightly or filled with grit, so even a brand-new seal won't sit flush. Side and top seals, if the door has them, are usually weatherstripping stapled or screwed to the jamb, and on older framing that trim has shrunk or pulled loose over the decades. None of this is a sign anything is broken in a dramatic way - it's just rubber doing what rubber does after enough freeze-thaw cycles. The draft you feel is simply the sum of a dozen small gaps that used to be sealed and no longer are.

What Most People Get Wrong

The most common mistake is buying a roll of foam weatherstripping from a hardware store and sticking it to the door face without checking whether the track underneath the bottom seal is actually straight. If the track is bent or packed with old debris, no amount of new seal material will close the gap evenly - you'll just have a new strip failing in the same spot within a season. The second mistake is assuming a seal upgrade will meaningfully change the temperature inside an uninsulated garage. It won't. A seal stops air movement and bulk water; it doesn't add R-value to a steel or wood panel that never had insulation to begin with. We'll tell you honestly when a seal job is the right scope and when the real issue is a sagging panel or an out-of-square frame that needs actual repair, not a $20 strip of vinyl. Replacing a seal on a door with a bent bottom panel is a patch, not a fix, and we won't pretend otherwise just to close a smaller job.

What the Weather Here Does to It

Cottage Grove sits in a climate band classified as cold and severe, which means the seals on your door aren't dealing with a mild autumn chill - they're cycling through hard freezes and thaws for a good chunk of the year. Vinyl and rubber both stiffen in deep cold, and a seal that was pliable enough to flex against the slab in October can crack rather than compress by February. That's when you start seeing a seal that looks intact but has a quarter-inch gap at one corner where it's lost its flexibility and popped out of the track. Ice is the other half of it: meltwater that works under a worn seal overnight will refreeze and can pin the door shut or crack the seal further as it expands. None of this is unique to any one house - it's what this climate does to the weakest point in a garage door system, year after year, until someone replaces it.

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