Why Is My Door Sticking in Summer?

It is a familiar Ottawa ritual: the door that behaved perfectly all winter suddenly needs a shoulder to close once the humid summer arrives. Then fall comes, the air dries out, and the same door swings like nothing was ever wrong. If that is your door, the cause is almost certainly the most natural thing in the world — wood reacting to moisture in the air.

What humidity does to a wooden door

Wood is hygroscopic, which simply means it absorbs and releases moisture from the surrounding air. When Ottawa's summer humidity climbs, a wood door — or a door with a wood core — takes on moisture and physically expands. The change is tiny in percentage terms, but a door only has a few millimetres of clearance in its frame to begin with, so a small amount of swelling is all it takes to make the slab rub, bind, and stick. When winter's dry indoor air returns, the wood releases that moisture, contracts, and the clearance comes back. That seasonal back-and-forth is the signature of a humidity problem, and it is why the fix is different from a door that sticks all year round.

Where doors stick, and why it tells you something

Swelling does not affect the whole door evenly. The spots that bind first point to what is going on:

• The latch edge and upper latch-side corner. This is the most common place to stick. It is the part of the door farthest from the hinges, so any swelling or sag shows up here first.
• The top edge. Often the least-finished part of a door, so it soaks up humidity fast and swells into the frame head.
• The bottom edge dragging. If the door scrapes the threshold as well as binding at the side, the slab has probably also dropped slightly on tired hinges — humidity and a sag arriving together.

It is not always the door

Two other things can masquerade as, or compound, summer sticking. The frame can shift out of square as the ground moves through the seasons, pinching the door regardless of its moisture content — look for gaps that are uneven from corner to corner. And sagging hinges drop the door so it binds and drags; if tightening the hinge screws improves things noticeably, the sag was part of the problem. Often it is a combination: a slightly sagging door that swells just enough each summer to start catching.

How to fix it the right way

The biggest mistake homeowners make with a summer-sticking door is to grab a plane or sander and shave down the swollen edge. It feels like a permanent fix — until the wood shrinks back in winter and you are left with an oversized gap that drafts cold air and leaks heat for the next five months. Removing material to solve a seasonal swell is borrowing comfort from summer and paying it back, with interest, all winter.

Better approaches, roughly in order:

• Tighten the hinges first. If a sag is contributing, lifting the door back into position may give you back enough clearance to stop the binding without removing anything.
• Find the exact contact point. Slide a thin strip of paper around the closed door to locate precisely where it binds. The fix should be targeted to that spot, not the whole edge.
• Seal the door's edges. Bare or unpainted edges — especially the top and bottom — absorb moisture fastest. Finishing all six sides of the door slows how much humidity it takes on, reducing how much it swells each summer.
• Address the frame if it has moved. If the binding is really a racked frame, the lasting fix is to re-set the frame and re-hang the door square, not to carve the slab.
• Sand only as a last resort, and only what binds year-round. If a spot truly catches in every season, a light, targeted sanding is reasonable — but for purely seasonal sticking, leave the wood alone.

When to call a professional

If the door sticks badly enough that it will not latch, if it is dragging on the floor, if the gaps around it are uneven, or if you are tempted to start removing material, it is worth having someone diagnose it properly. The right fix depends entirely on whether you are dealing with a swelling slab, a sagging door, or a shifted frame — and getting that diagnosis right is the difference between a door that works in every season and one that either sticks in summer or drafts in winter. A professional can correct the actual cause and leave you with a door that closes cleanly in July and seals tightly in January.

Related door repair services in Ottawa

If this article points to a problem you're dealing with right now, these pages go deeper — or you can browse the rest of the blog and request a free quote:

• Door Won’t Close Ottawa — when seasonal swelling tips over into a door that won’t latch at all.
• Hinge & Hardware Repair — correcting the sag that makes summer sticking worse.
• Door Frame Repair Ottawa — when the frame, not the door, has moved out of square.