Florissant, MO · Garage Door Service
Florissant homes built between 1947 and 2011 lose their weather seals as cold winters push doors out of square on original tracks. Here's the fix and the cost.
Florissant sits in a cold-moderate climate band, and that means real freeze-thaw cycling every winter: the ground under a slab and driveway apron swells and contracts, and so does the wood or vinyl jamb the door seal is nailed to. Most houses in this part of the county went up between 1947 and 2011, with the median build year sitting around 1963 and the bulk of the stock dating to the 1960s and 70s. That generation of garage was framed to the standards of its decade, not to today's, and after fifty-plus winters of swelling and shrinking, the jamb it's nailed against is rarely still flat. A seal that was cut straight in 1968 is now pressed tight in one corner and gapped an inch in another. You feel it as a cold draft along the floor, or daylight showing at the top corner of the panel. It isn't the rubber failing on its own - vinyl bottom seals do wear out, but on a lot of these houses the bigger problem is that the frame around the seal moved and the seal never had a chance.
The usual fix homeowners try is a tube of caulk or a strip of foam tape along the gap, and on a newer, square opening that's a fine stopgap. On the older stock common through this stretch of the county - houses built well before modern jamb bracing became routine - it treats the symptom and skips the cause. Caulk fills the visible gap for a season, then the jamb keeps working with the seasonal swelling and the gap reopens somewhere else on the same door. The mistake isn't laziness, it's that the fix looks like it worked: the draft stops for a few months, so nobody checks whether the track is still plumb. On a door with 50-plus years of thermal movement behind it, the track and the seal need to be checked together. A new bottom seal set into a jamb that's out of square by even a quarter inch will fail again within a year, and the second time it's usually worse because the gap has widened.
Across the wider service area - out through Old Jamestown, Black Jack, Berkeley, Hazelwood, and the other close-in communities within a few miles - the housing pattern repeats: postwar and mid-century construction, aging jambs, and a lot of doors that have never had the track re-shimmed since installation. With 225,179 households and 116,163 owner-occupied houses across that area, a large share of them built in that same 1960s-70s window, seal failure from frame movement isn't a rare call, it's a pattern we see house after house. Median household income here runs $84,942, which is enough that most owners choose to fix rather than let a draft sit through another winter, but that also means the fix has to actually hold, not just quiet the symptom for a season. The situation on any given door usually breaks one of two ways: either the seal itself has hardened and cracked from age and just needs swapping, or the jamb and track have shifted enough that the seal can't do its job no matter how new it is. Telling the two apart takes a look at the door in person.
I can't give you a number here without seeing the door - a straight seal swap on a door that's still square is a different job from one where the track needs to come off and get re-set against a jamb that's moved over fifty years of freeze-thaw. That second job takes longer and costs more, and quoting a flat price for either without knowing which one you've got would just be a guess. What I can tell you is what drives the difference: door age and size, whether the track is still plumb, and whether the jamb itself needs shimming before a new seal will even seat right. On some of the older doors around here, the seal channel itself is a non-standard width that newer stock doesn't stock in bulk, which can add a short wait for the right part. The honest answer is that a seal-only job is the cheaper half of this, and a track-and-jamb job is the one that actually stops the draft for good.
On houses built in the 1960s and 70s, common through this area, the jamb the seal presses against moves slightly with each freeze-thaw cycle. In warmer months it can settle back close to flush; in a cold-moderate climate like ours, winter is when the gap opens widest and you feel the draft.
Sometimes. If the seal itself has hardened or cracked, a new one solves it. If the jamb or track has shifted out of square over the decades, which is common on houses from this era, a new seal alone will gap again within a season. It needs a look to tell which one you've got.
Watch where the light or draft comes through. A worn seal usually shows a gap evenly along one edge. A track or jamb problem shows up as a gap that's wider at one corner than the other, or a door that doesn't sit flush even when closed all the way.
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