Most homeowners blame humidity. Sometimes that's right. But if your doors are sticking year-round — or worse than they were last year — your foundation is the more likely culprit.
Humidity vs structural movement
Humidity-related sticking is seasonal and reversible — the door binds in August and frees up in January. Foundation movement causes permanent or worsening sticking.
Why foundation movement throws frames out of square
When a corner of your home settles even 1/2", the door frame skews from a perfect rectangle into a parallelogram. The door no longer fits its opening.
The pattern that signals foundation issues
Multiple doors sticking in different rooms — especially on the same side of the house — almost always means foundation settlement. So do windows that won't open after years of working fine.
What to look for alongside sticking doors
Diagonal cracks above door frames, gaps between trim and wall, stair-step cracks in exterior brick, and sloping floors. Any of these together = call for an inspection.
The fix
Stabilize the foundation first (usually steel push piers under the settled corner), then re-shim the door. Planing the door without addressing the foundation is a band-aid.
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