Swollen or warped wood garage door sections

Wood door trouble

How wood reacts to Houston air

Wood is made of tiny cells that absorb water vapor from the air and release it again when the air dries. When a board takes on moisture, it expands, mostly across its width and thickness rather than along its length. In a place where the air stays warm and damp for months at a time, that movement is constant and often larger than owners expect.

A garage door section is a framed assembly. It may have solid wood rails and stiles with panels set into them, or it may be wood veneer over a core. The parts of the door are cut to fit together with small, deliberate gaps. When the wood swells, those gaps close, and the pieces start to push against each other and against the track and jamb.

Heavy rain and storm season make it worse. Water blown against the door face soaks into the finish if it is thin or worn, and water that runs down and sits at the bottom edge gets drawn up into the end grain like a sponge. That is why the lowest section is usually the first to show trouble.

Then the air dries for a spell and the wood shrinks again. Repeated swelling and shrinking leads to cracks in the finish, split joints, warped sections and loose hardware screws. The door you installed straight can slowly turn into a door that bows.

Signs that moisture has changed your door

The first sign is often a change in how the door moves. It may start rubbing on one side of the jamb, scrape against the weatherstrip, or move more slowly than it used to. You may notice a new squeal as swollen edges drag along the track or stop.

Visual changes follow. Look for sections that bow in or out, for panels that bulge within their frames, for gaps that open at the corners, and for paint that bubbles, peels or cracks. A dark, stained patch at the lower edge often means water has been sitting there for a while.

Touch tells you more. Press gently on the bottom edge with a thumb. Wood that is firm and dry feels solid. Wood that feels soft, spongy or crumbly has begun to rot. A screwdriver tip pressed lightly into a suspect spot, with care and only into the wood, sinks in where rot has set in. Do not poke around the hardware or the springs.

Also pay attention to the door when the weather changes. A door that sticks after several days of rain and moves freely after dry weather is telling you it is a moisture problem, not a mechanical failure in the opener.

• Rubbing on the jamb or sticking after wet weather points to swelling.
• Bowing, bulging panels and open corner joints point to warping.
• Soft, dark or crumbly wood at the bottom edge points to rot.
• Peeling or bubbling finish shows moisture has been getting under the paint.

Why the bottom edge suffers first

Water follows gravity. Rain splashes up from the driveway, runs down the door face and collects on the lowest rail. If the bottom seal is torn or compressed flat, the edge sits in a thin film of water after every storm. Wood end grain is like a bundle of straws, and it pulls water upward with surprising force.

The bottom edge is also the part that gets abused. Wheels bump it, lawn equipment brushes it, and mud and leaves pile against it. A small scrape in the finish at the lowest point gives water a direct path into the wood. Once the finish is open, rot can start behind it where nobody can see.

Because the bottom section carries the bottom brackets and cable attachments, rot here is more than cosmetic. Screws that hold the bottom bracket hold the wood, not a metal frame, and soft wood loses its grip on them. A cable under tension pulling on a bracket in rotten wood is a real hazard.

If your door has a damaged seal, read about a torn bottom seal and about the gap at the bottom of a garage door. Sealing the bottom edge is one of the simplest ways to slow down the damage.

Sticking, rubbing and slow movement

A swollen section is slightly wider or thicker than it was, so it presses against whatever sits next to it. That may be the jamb, the stop molding, the track or the neighboring section. The result is friction, which the opener has to overcome.

You may hear the opener strain, see the door slow down at the same spot each time, or watch it stop and reverse. Added friction can also make the opener trip its safety reversal, which is a normal protection but also a signal that something is dragging. The pages on a garage door rubbing on the jamb and a door that opens slowly cover related symptoms.

Please resist the urge to turn up the opener force settings to push through the drag. More force makes the door press harder on whatever it is catching, can damage the sections, and reduces the sensitivity of the safety reversal. It also hides the real cause, which is usually the wood.

A door with moisture swelling can also throw off the balance a little, because the added weight of absorbed water changes how heavy the door is. Wet wood is noticeably heavier than dry wood. If you lift the door by hand with the opener disconnected, it may feel heavier than you remember.

Warping, bowing and sections that no longer line up

Warping happens when one face of a board takes up more moisture than the other. The inside of a garage door faces a covered space and the outside faces rain and sun, so the two faces age differently. The board curves toward the drier side, and the section bows.

A bowed section no longer sits flush against its neighbors. You might see light between sections, a stepped look at the joints, or a door that curves slightly when viewed from the side. The rollers on that section may no longer ride in the center of the track.

Hinges and struts are fastened to the wood, and as the wood moves it works those fasteners loose. Look for screw heads that have pulled out a bit, hinge leaves that wobble, and cracked paint around the hardware. Do not tighten bracket bolts near the springs or cables yourself. Those areas are under load.

A badly warped section may be too far gone for straightening. Sometimes a section can be reinforced or replaced, and sometimes the more practical route is a new door. The page on steel, wood and aluminum doors compared can help you think about alternatives.

Care that keeps a wood door in good condition

A wood door in this climate asks for steady attention to its finish. The coating is the main shield against moisture, and it must cover every surface, including the top and bottom edges and the inside face where possible. Keeping paint or stain intact, and touching up chips and scratches early, protects the wood far better than any repair afterward.

Inspect the door a couple of times a year, and again after a major storm. Look for hairline cracks in the finish, mildew spots, darkened areas and any place where water collects. Wash gently with a mild cleaner and a soft brush, rinse, and let the door dry before recoating. The guide on caring for a wood garage door goes into the routine in more detail.

Keep the bottom seal in good shape and keep the area below the door clear. Debris, mulch and pooled water against the door hold moisture where you do not want it. Where possible, make sure the driveway slopes away from the door and drains rather than pooling.

Ventilation inside the garage helps the wood dry evenly. A closed, stuffy garage keeps humid air against the inner face. Moving air, a dehumidifier or a vent, within what your home and your association allow, can reduce the moisture load. See the guide on humidity and your garage door for more ideas.

Repair, section replacement or a new door

When swelling is mild and the wood is still sound, the answer may be a fresh finish, an adjusted seal and a good cleaning. A technician can look at whether the door is binding in the track, whether the hardware is secure and whether the opener is being asked to push against drag.

When the bottom section is rotted or badly warped, you can consider replacing that section. Wood sections are usually made to the door model, so the match depends on the maker and on the age of the door. Read the page about panel replacement to see what is involved and what limits apply.

When several sections are affected, or the door is old and the hardware is also tired, a new door may be sensible. Today there are insulated steel doors made to look like wood, composite doors with wood grain, and real wood doors for owners who love the look. The guide on how to choose a garage door and the page on new garage door installation are useful starting points.

If your home sits in an HOA community, ask your association what style, color and material rules apply before you choose a replacement. Requirements vary by community, so a short question to the association now saves trouble later.

Telling swelling apart from other causes of sticking

Not every sticking wood door is a swollen one. A bent track, a worn roller or a section knocked out of line can all produce the same rubbing and slow movement. The difference is in the pattern. Moisture problems come and go with the weather and tend to affect the same spots each season. Mechanical problems stay put regardless of the forecast and often appear suddenly after an impact.

Look at where the contact happens. Swelling usually presses along an edge of a section or at the jamb for a long stretch of travel, leaving a shiny or scuffed band on the wood. A bent track or loose hinge tends to catch at a single point, often with a bang or a jolt as the roller hits it.

Watch the door in dry and in wet weather if you can. If the rubbing eases when the air dries, you have good evidence for moisture. If it stays the same, tell the technician so they can check the tracks, rollers and hinges for a mechanical cause. Notes like these, written down with dates, are more useful than any guess about what is wrong.

It also helps to remember that both can exist together. A door with a slightly out of line track will suffer more from a bit of swelling than a perfectly aligned one. Fixing the track alignment may leave you with a door that rubs only in the wettest weeks, and that is a sign the wood itself needs care.

Planning ahead for the next wet season

The calm time to deal with a wood door is before the wettest part of the year, not in the middle of it. A dry week is a good moment to clean the door, touch up the finish, check the seal and look at every bracket and hinge. Doing this once or twice a year costs little compared with replacing a rotted section.

Think about what will change around the door before storm season. Move stored cardboard and damp items off the floor along the door, clear leaves from the drain or apron in front of the garage, and check that the weatherstrip along the sides and top is still pressing evenly. A door that sits dry through a storm swells less.

If you are considering a new door, think about how much upkeep you want to take on. Real wood rewards care and shows it. Other materials ask for less. Neither choice is wrong, and the right fit depends on the look you want, what your community allows and how much time you want to spend on maintenance.

Whichever way you lean, keep a short log of what you notice and when. The guide to keeping a garage door service log gives a simple format, and a few lines after each storm build a clear picture over a season or two.

Safety points when the door is hard to move

A swollen door that sticks is a heavier load on the whole system. Springs, cables and the opener all work harder. Using the door repeatedly in that state can speed up wear and increase the chance that something gives way at the wrong moment.

If the door will not move freely by hand when the opener is disconnected using the manual release, do not force it. A door that is stuck by swelling can jump loose suddenly. Read the guide on using the manual release safely before you try, and keep people and vehicles clear of the door path.

Never adjust springs, cables or the brackets that hold them. Those parts hold the full weight of the door under high tension and need a trained technician. If you find that a bottom bracket sits in soft or crumbling wood, treat that as a reason to stop using the door and call.

Children and pets should stay away from a door that is rubbing, stuck or moving oddly. The guide on garage door safety for children and pets offers habits that keep everyone safe.

What to tell the technician and what happens next

When you call, explain what the door is made of, how old it is if you know, and what it is doing. Say when the trouble began, whether it gets worse after rain, which side rubs, and whether the bottom edge looks soft or dark. Mention any recent storm, leak or flooding in the garage.

On site, the system is inspected as a whole. The technician looks at the sections, the hardware, the tracks, the springs, the cables and the opener to separate moisture problems from mechanical ones. The options are discussed before work begins, so you can choose between care and adjustment, partial replacement or a new door.

After the work is done, the finished job and normal operation are reviewed with you. You should see the door travel smoothly, close firmly against the floor and sit evenly in the opening.

To get ready, see the guide on preparing for a garage door service visit. If you are weighing cost against condition, the comparison of repairing versus replacing the door offers a calm framework.

Questions and answers