Why Doors Stick When a Foundation Moves

The sticking door is foundation repair's most misunderstood symptom — blamed on humidity when it's movement, blamed on movement when it's humidity. Both verdicts are common, the fix differs by about ten thousand dollars, and you can usually tell them apart from your hallway.

The geometry of a stuck door

A door only works because two rectangles agree with each other. When a slab corner settles even a quarter inch, the wall above leans with it, and the door frame inside that wall racks — squeezing one top corner. The door hasn't changed at all; its hole has. That's why foundation-stuck doors bind at a corner (usually the top latch-side or top hinge-side), while humidity-swollen doors rub along a whole edge.

The pattern test

• One door, rubbing along its full edge, in humid months, anywhere in the house → weather. Wood swelled. It will shrink back by October.
• Several doors, binding at corners, clustered near one part of the house, regardless of season → geometry. Something under that cluster moved.
• Bonus checks: look at the gap around the closed door (a wedge-shaped gap = racked frame), at the strike plate (scrape marks above or below the latch = frame moved vertically), and above the frame (diagonal drywall cracks from the corners corroborate movement).

Which doors to watch in a Texas house

Doors near exterior corners feel perimeter settlement first — especially on south- and west-facing corners that take the most drought stress. Interior doors along the center of the house responding while corner doors stay fine suggests interior movement (often a plumbing leak story) — rarer and worth measuring sooner.

If the pattern test points to movement, the next step isn't a contractor pitch — it's numbers: a free elevation survey reads exactly how far out of level each frame's floor is, and whether the cluster of sticky doors maps to a genuine low spot.