Fort Worth sits in a severe heat climate band, and that matters more for your door seals than almost anything else on the house. Vinyl and rubber weatherstrip is built to flex, but it's not built to flex through the kind of daily expansion-contraction cycle summers here put it through. The bulb seal along the bottom of the door and the flat strip running up the jamb both harden and crack faster when they're baking against a steel or aluminum panel that's absorbing direct sun for most of the day.
What you notice first usually isn't a dramatic failure. It's a thin line of daylight at the bottom corners, or a draft that shows up specifically on the hottest afternoons when the panel has expanded slightly and pulled the seal away from the track. By the time you can see the gap, the material underneath has usually already gone brittle. Repeated heat cycling is also why seals that would last a decade in a milder climate tend to need attention here well before that. It's not neglect - it's just what severe heat does to rubber and vinyl, year after year, on a door that doesn't get to sit in shade.
Housing across the service area was built between 1953 and 2010, with a median build year around 1992, and most of the stock in the 27 named areas we work - places like North Side, Diamond Hill, the Cultural District, and Near East Side - dates to that 1980s-90s wave. That's relevant because a lot of those doors still carry their original weatherstrip channel, even if the door itself has been replaced once. The seal groove on a 30-year-old jamb isn't always the same width as what current stock weatherstrip is cut for, so a straight swap without checking fit is a common reason a fresh seal still lets air through.
With a median household income of $98,003 across the service area, most owners can afford a proper seal replacement rather than living with foam tape patches, and that's usually the better move. Across the area's 98,629 households, about 58,580 are owner-occupied houses - meaning most of the calls we get about drafts and gaps come from people who actually own the place and want it done right, not landlords looking for the cheapest patch.
Start at the bottom. The bottom seal takes the most direct sun and ground heat, so it's usually the first thing to go brittle or split. Run your hand along it - if it's stiff instead of pliable, it's done, regardless of how it looks from a few feet away.
Next, check the side and top jamb weatherstrip, the vinyl strip nailed or screwed into the frame. On the 1980s-90s stock common through this area, that strip is often original or a single replacement, and it dries out unevenly - worse on whichever side of the garage gets more afternoon sun.
Then do a daylight test at dusk with the garage light off and the door closed: stand inside and look for light lines at the corners and along the bottom. Any gap wider than a pencil is air moving both ways, which in a severe heat climate means your garage interior temperature tracks the outside temperature almost exactly, all summer long.
Last, look at the threshold itself. If the concrete has settled or cracked - common in older slabs - no seal will close that gap fully, and that's a different repair than a seal swap.
Swapping a bottom seal or a length of jamb weatherstrip is genuinely a job most owners can do with a utility knife and an afternoon. Where it stops being that simple is when the seal keeps failing in the same spot within a season or two - that usually means the track or the panel itself has warped slightly from heat cycling, and a new seal is just masking a fit problem that will keep coming back.
We'll say this plainly: we don't recommend replacing seals on a door where the bottom panel has visibly bowed. At that point the seal was never the real problem, and buying another one is money spent on the wrong fix. If you're seeing daylight at the corners but the panel edge itself looks straight and true, a seal replacement should solve it. If the gap changes shape depending on whether the door's been in the sun for an hour or a day, that's the panel talking, not the weatherstrip, and it's worth having someone look at the door itself before you buy more vinyl.
In this climate, repeated summer heat cycling is harder on vinyl and rubber seals than almost anywhere milder. If a seal is cracking again within a year, check whether the track or panel has warped slightly - a seal replacement won't hold if it's fighting a fit problem underneath it.
Given that most housing in this service area was built between 1953 and 2010, with a lot of it from the 1980s and 90s, it's common for the jamb weatherstrip channel to be original even if the door panel itself has been swapped once along the way.
Do a daylight test at dusk with the interior light off. A steady gap that doesn't change is usually the seal. A gap that widens after the door's been in direct sun for a few hours points to panel or track warp from heat expansion, not the weatherstrip.
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