Sticking Doors: Seasonal Cycle or Real Movement?

A door that has started to catch is one of the most common reasons somebody first wonders about their foundation. It is also one of the least conclusive symptoms on its own, because at least four unrelated things produce it.

The four causes, cheapest first

1. The door itself. Wood doors take on moisture and swell, particularly on an exterior opening or in a bathroom. A door that binds along its top edge or its latch stile in humid weather and frees up when the air dries is doing what wood does. Planing it in August is how people end up with a gap in February.

2. Hinges and hardware. A loose top hinge lets a door drop and catch at the latch side. Three long screws into the frame usually fixes it, and it is worth checking before anything more dramatic, because it takes four minutes.

3. Framing movement above. Lumber dries and shrinks for the first year or two of a house’s life, and trusses move seasonally with attic humidity. Interior doors on a young house catching at one corner is often this.

4. Foundation movement. The one people worry about, and the one that produces a very specific pattern.

The pattern that means foundation

Foundation movement rarely affects one door in isolation. What it does is affect a region of the house. So the diagnostic question is not whether a door sticks, it is whether the doors that stick share a location.

Signs pointing at foundation movement:

• Several doors binding on one side or one end of the house while doors elsewhere operate normally
• The binding is consistent in direction: the same edge catching on each affected door
• A floor that reads out of level in the same area, checkable with a marble or a long level
• Cracks at the corners of those same openings, either in drywall inside or in brick outside
• Gaps opening between skirting and wall, or between a cabinet run and the ceiling, in the same region
• The problem has been getting gradually worse over years rather than coming and going

Signs pointing away from it: doors sticking scattered randomly around the house, sticking that fully resolves every year, a house under two years old, and a single door with a loose hinge.

The seasonal test, which is free

On the ground under this county, the moisture cycle is the driver, and it is measurable. NOAA’s 1991 to 2020 normals for the Murfreesboro 5 N station give a wettest month of 5.68 inches in June and a driest of 3.46 in October, with December close behind June at 5.54. Soils here include series with linear extensibility above nine percent, meaning genuine volume change with moisture.

So the test is simple. Write down which doors bind, and the date. Do it again after a wet stretch and again at the end of a dry one.

• If the same doors bind and release on a roughly annual rhythm, and nothing is cumulatively worse than last year, that is the soil breathing under the house. Annoying, not structural.
• If each cycle leaves the doors slightly worse than the last, or if a door that used to release no longer does, that is movement rather than a cycle.

That distinction costs nothing to establish and it is the single most useful thing a homeowner can do before spending money.

What to check while you are at it

Since you are already walking around:

• Put a marble on the floor in each affected room and see whether it runs, and which way
• Run a long level across the floor near the affected doors
• Look at the corners of the same openings for diagonal cracking
• Go outside and look at the brick below those windows for stepped cracking through the mortar joints
• Check where the nearest downspout discharges, because water is usually somewhere in the story

Photograph anything you find, with something in frame for scale, and date it. Those photographs make any later assessment considerably better.

When to stop testing and call

Do not wait a season if a foundation wall is visibly leaning inward, if there is a horizontal crack across the middle of a wall, if water is coming in, or if a door has gone from catching to not closing within a few months. Those are not seasonal signatures.

Otherwise, recording it and looking again after the next wet and dry cycle is a reasonable, cheap first step, and it produces evidence a contractor can work from.

More on the underlying mechanisms in settlement or soil pressure, and on recording cracks properly in the crack reading guide.