Published 2026-07-14 · by David Yifrach, Owner, Seaside Garage Door Experts · Virginia DPOR Class A Contractor #2705188091
Three Garages, One Week of July Downpours: Why Water Keeps Getting In
In the second week of July we took three separate water-in-the-garage calls, in Colonial Place in Norfolk, Wythe in Hampton, and Deep Creek in Chesapeake, and all three traced to the same pair of failures: a flattened vinyl bottom seal and concrete that pitches toward the door. Norfolk averages 46.9 inches of rain a year and July delivers a lot of it sideways, an inch in an hour ahead of a thunderstorm cell. That is exactly the storm that finds a seal which went flat two summers ago. Here is what the week of jobs looked like, what each fix cost in 2026 dollars, and the five-minute check that tells you whether your door is next.
Three calls, one pattern
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The Colonial Place call, in the 23508 zip a few blocks off the Lafayette River, came in the morning after the July 9 storms: a quarter inch of standing water across the front third of a two-car garage, cardboard boxes wicking it up. The Wythe call in Hampton was a one-car garage where water had been sneaking in for weeks and the owner only noticed when a rolled rug came up soaked. Deep Creek was the loudest one, a homeowner who watched water sheet under the door in an afternoon downpour and called us before it stopped raining.
Different houses, same autopsy. In all three, the vinyl bottom seal had gone flat and hard, with daylight visible under sections of the door. In two of the three, the slab or driveway apron had settled so water arriving at the door had nowhere to go but under it. This is what a pattern week looks like in our schedule, and July is when it shows up, because summer thunderstorms deliver rain faster than a marginal seal can shed it.
Why coastal seals flatten by year three
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The standard builder-grade vinyl seal lasts two to three years on the coast versus seven to ten inland. Salt air and ozone attack the plasticizers that keep vinyl supple, and July heat bakes the bottom of a sun-facing door well past 130 degrees, so the seal takes a compression set: it stays squashed in the shape of the slab instead of springing back to fill the gap. Once that happens, every low spot in the concrete is an open channel. The same gap that admits water clears the 1/4 inch a house mouse needs, which is why our water calls and our rodent calls track the same failed part.
The fix we install is a coastal-grade EPDM seal, the same rubber family used in roofing membranes, which shrugs off salt air and ozone and stays flexible through the temperature swings that kill vinyl. On doors where the aluminum retainer has corroded, the retainer gets swapped at the same time, because a pitted retainer chews through new seals from the inside.
The slab problem, and what each fix cost
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A seal can only close the gap between door and slab. It cannot fight water that arrives with momentum because the apron slopes toward the opening, and two of the three garages had exactly that. The answer there is a threshold strip, a raised rubber dam epoxied to the slab under the closed door, which adds $95 to the job. Colonial Place took a two-car EPDM seal at $289 plus the threshold strip. Wythe was a single-car seal at $249 with a corroded retainer swap at $85. Deep Creek took the two-car seal, the threshold, and new jamb weatherstripping because the doorstop flaps had curled, which pushed it into the combined perimeter range of $449 to $549 that covers seal plus jambs plus header. Where the driveway actively drains toward the door, we say so in writing and point the owner to a trench-drain contractor, because rubber is not a stormwater plan.
One caution from the Wythe job: the owner had tried a DIY seal the summer before, and the insert was the wrong profile for the retainer, so it fell out of one end within months. We covered that failure pattern in our DIY bottom seal post, and the profile question, T-style versus P-bulb versus J-type, is most of the reason the parts-store fix disappoints.
Check your door before the next storm cell
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Close the door on a bright day and look along the bottom from inside with the lights off. Daylight anywhere means water, mice, and conditioned air are all using the same gap. The Department of Energy puts the garage-to-house interface at 10 to 13 percent of total home air leakage, and at Dominion's 16.43 cents per kilowatt-hour this June, a garage that breathes freely under the door is a line item on your bill, especially with a room over the garage fighting the heat. The pencil test, sliding a pencil under the closed door at the low spots, takes one minute and is described step by step in our how-to hub.
If the seal fails the look test, the job is quick and priced flat: $249 single-car, $289 two-car, doorstop molding at $249 to $349 for both jambs and the header, threshold strip at $95. Details are on our bottom seal and doorstop replacement page, and the Yorktown version of the sloped-slab problem is written up in our Marlbank Cove threshold strip case study. The perimeter is also the cheapest pest control you can buy, which we covered in our seal, rodents, and energy post. Since 2013, Virginia DPOR Class A Contractor #2705188091.
Frequently asked questions
Why does water come under my garage door when it rains hard?
Two failures working together: a bottom seal that has flattened and hardened so it no longer fills the gap, and concrete that slopes toward the opening so water arrives faster than the seal can shed it. Coastal vinyl seals take a compression set in two to three years, and July thunderstorm rain rates find every low spot in the slab.
What does a new garage door bottom seal cost in Hampton Roads?
In 2026, a coastal-grade EPDM bottom seal runs $249 for a single-car door and $289 for a two-car door installed. A corroded retainer swap adds $85, a threshold strip adds $95, and a combined perimeter job covering the seal plus both jambs and the header runs $449 to $549.
Will a new bottom seal stop water if my driveway slopes toward the garage?
Not by itself. A seal closes the gap between door and slab, but water arriving with momentum needs a threshold strip, a raised rubber dam epoxied to the slab under the closed door. Where the driveway actively drains toward the opening, a trench drain cut into the apron is the durable answer, and we will tell you that in writing rather than sell you rubber that cannot do the job.
How long does a garage door bottom seal last near the coast?
Builder-grade vinyl lasts two to three years in Hampton Roads salt air versus seven to ten inland, because salt and ozone attack the plasticizers and summer heat bakes in a compression set. EPDM rubber, the material used in roofing membranes, resists both and is what we install on coastal doors.
Does a leaking garage door seal raise my electric bill?
Yes. The Department of Energy attributes 10 to 13 percent of total home air leakage to the garage-to-house interface, and a visible gap under the door feeds it. At Dominion Energy's June 2026 rate of 16.43 cents per kilowatt-hour, a garage that exchanges air freely makes the HVAC work harder, most noticeably in a room over the garage.
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