Published 2026-07-07 · by David Yifrach, Owner, Seaside Garage Door Experts · Virginia DPOR Class A Contractor #2705188091
Three Sticking Garage Doors in Eight Days: Olde Towne's Swollen Doorstop Molding Problem
Three garage doors in Portsmouth's Olde Towne dragged, scraped, or stuck against their frames in the first eight days of July, and every one of them traced to the same cause: original pine doorstop molding that had soaked up peak-summer humidity, swollen against the door, and started rotting from the back side where nobody ever looks. Olde Towne's housing stock is some of the oldest in Hampton Roads, and the wood trim around its garage doors has been drinking 46.9 inches of annual rainfall and roughly 70 percent average humidity for decades. When July pushes that humidity toward its August peak near 74 percent, swollen molding is the predictable result. Below is what we found on all three calls, the five-minute screwdriver test that tells you if your own molding is next, and the 2026 cost to replace rotted pine with cellular PVC that never swells again.
The pattern: three calls, three streets, one cause
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The first call came from a brick foursquare near Court Street: door scraping so hard on the left jamb that the opener reversed, which the homeowner reasonably assumed was an opener problem. The second was two days later off London Boulevard, a door that would not seat fully closed, leaving a half-inch gap the homeowner noticed because his garage smelled like a swamp. The third, near Crawford Parkway, was the loudest: a rubbing squeal on every cycle that the neighbors could hear. All three doors were mechanically fine. On all three, the pine doorstop molding nailed to the jambs had swollen into the door's travel path. On two of the three, a screwdriver pressed into the molding's back side sank in like it was styrofoam. That is brown rot, and it had been working for years before the July swell made it loud.
Why July humidity swells pine molding on old Portsmouth frames
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Doorstop molding is the strip of trim that runs up both jambs and across the header, with a vinyl flap that seals against the face of the door. On most Hampton Roads homes built before the 2000s, that strip is finger-jointed pine. Pine is a sponge. Norfolk-area weather delivers 46.9 inches of rain a year and average humidity around 70 percent, and in July and August the humidity peaks near 74 percent. Wood movement follows moisture, so the same strip that clears the door in dry October swells several sixteenths in peak summer, and on an older frame that was never square to begin with, that is enough to bind the door. Worse, in coastal humidity brown-rot fungi commonly get established in pine doorstop within 5 to 7 years of the paint film first cracking. The rot works from the hidden back face, so the molding looks painted and fine while it turns to punk underneath. The swelling is the symptom you notice; the rot is the problem you are actually fixing.
The screwdriver test: five minutes, no tools bag required
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Check your own molding this week, especially if your home is in 23704 or 23707 and the trim predates you. With the door closed, take a flathead screwdriver and press the tip firmly into the doorstop molding at three spots: six inches off the slab on each jamb, and anywhere the paint is bubbled or checked. Sound pine pushes back and barely dents. Rotted pine gives way with a soft crunch, or the tip sinks in an eighth of an inch or more. Then look at where the vinyl flap meets the door face. A flap that is wavy, curled, or flattened has quit sealing, which is its own problem: the gap it leaves feeds conditioned air out and pests in, the same failure chain we documented in our June pest-intrusion pattern piece. While you are down there, run the pencil test on the bottom seal too, since a failed perimeter usually fails together.
The fix: cellular PVC, and what it costs in 2026
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The repair on all three Olde Towne doors was the same: strip the rotted pine, treat and inspect the jamb behind it, and install cellular PVC doorstop molding with a fresh vinyl flap, fastened with stainless ring-shank nails. Cellular PVC does not absorb water, does not swell in August, does not feed rot, and takes paint if you want it to match the trim. In 2026 across Hampton Roads, doorstop molding replacement on both jambs plus the header runs $249 to $349 depending on door size and how much jamb repair hides behind the old trim. When the bottom seal is failed too, a combined perimeter rebuild on a two-car door runs $449 to $549, which is how two of the three Olde Towne jobs landed. The full breakdown lives on our bottom seal and doorstop replacement page, and the Larchmont perimeter rebuild case study shows what the whole job looks like on a house of the same era. One note on scope: if a sticking door persists after the molding is corrected, the tracks and rollers need a look, and that is a tune-up visit, not a trim job.
Why not just plane it down or renail the pine?
Rather send a photo than describe it? Text your jambs to (757) 780-5858 and we will tell you what you have.
Two of the three homeowners asked the fair question: can you just shave the swollen spot? You can, and in February it will work, because the wood will have shrunk back and the planed section will clear fine. Then next July it swells again, minus a little more paint protection, plus a little more rot. Planing treats the symptom on a strip of wood that is already structurally failing and costs real labor to dress up. Pine doorstop on a coastal home is a wear item on a 5 to 7 year rot clock; cellular PVC is a one-time correction. Since 2013 we have never been called back to re-fix a PVC doorstop for swelling, and we have replaced a lot of twice-planed pine. Spend once, and the door glides in August exactly like it does in January. If you are not sure which camp your trim falls in, call (757) 777-3330 and describe what the screwdriver test told you; that one detail usually settles it over the phone.
Frequently asked questions
Why does my garage door stick or drag in summer but not in winter?
Wood doorstop molding and jambs absorb moisture and swell during Hampton Roads' summer humidity peak, which runs near 74 percent in August. The swollen trim intrudes into the door's travel path and binds it. In winter the wood dries and shrinks back, which is why the sticking disappears until the next humid season.
How do I know if my doorstop molding is rotted and not just swollen?
Press a flathead screwdriver firmly into the molding near the slab and anywhere paint is bubbled. Sound wood barely dents; rotted wood crunches or lets the tip sink an eighth of an inch or more. Brown rot works from the hidden back face, so painted molding can look fine while it is punk underneath.
What does doorstop molding replacement cost in Portsmouth in 2026?
Across Hampton Roads, replacing the doorstop molding on both jambs plus the header runs $249 to $349 in 2026, depending on door size and any jamb repair behind the old trim. A combined perimeter rebuild with a new bottom seal on a two-car door runs $449 to $549.
Is cellular PVC doorstop molding worth it over new pine?
On a coastal home, yes. PVC does not absorb water, so it does not swell in August or feed brown rot, and it takes paint. New pine restarts the same 5 to 7 year rot clock the old trim just finished. The material cost difference is small next to the labor of doing the job twice.
Can a swollen doorstop make my opener reverse like something is broken?
Yes. The drag from swollen molding raises the force the opener needs, and a properly set opener reads that resistance as an obstruction and reverses. Homeowners frequently assume the opener is failing when the actual fault is the trim binding the door. Fix the molding before adjusting opener force settings.
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