What do sagging floors and sticking doors mean?
They can mean the structure under or around them has moved, or they can be the ordinary result of humidity and age. The pattern, how fast it changed, and whether cracks come with it help tell the two apart.
A single sticking door in humid weather is rarely a concern. Several signs at once deserve a look.
Why do doors stick?
Wood swells with humidity, so doors often stick in summer and loosen in winter. That is normal. Doors that stick year round, or that suddenly started sticking, are different. When a frame goes out of square, the opening is being pulled by movement in the structure.
Look for these together:
- Gaps above a door that are wider on one side.
- Diagonal cracks running from the corners of doors and windows.
- Baseboards or trim pulling away from the floor.
- Several doors in one area all changing at the same time.
What causes a floor to slope?
A floor slopes when what supports it has settled or weakened.
- Foundation or footing settlement, including from clay soil that shrinks in dry summers.
- A beam or girder that has sagged or been undersized.
- Posts or piers that have shifted.
- Rot or insect damage in joists or sills.
- Framing that was cut or altered, for example when a wall was removed.
Old houses often have floors with some slope from decades of load. The concern is a slope that is new, getting worse, or paired with cracks.
Why does a floor feel bouncy?
Bounce comes from joists that are too long, too small or damaged for the span. It is often a comfort issue, not a safety one, but it can also point to a cracked or overstressed member. A new bounce that was not there before should be checked.
Can you check anything yourself?
You can look without altering anything. In the basement, see whether beams are straight, posts are plumb and joists sit fully on their bearings. Note any wet or soft wood. Photograph what you see, with the date.
Do not jack up the floor or add posts on your own. That can shift loads in ways you cannot see. See how to tell if a wall is load-bearing.
When should you stop and call?
Call promptly if a floor has dropped suddenly, a beam looks cracked, you hear cracking, or a doorway has racked noticeably. Keep heavy items and people off the area until it is checked. Related patterns appear in foundation cracks: which ones matter.
Our structural damage assessment service covers this. The fee depends on scope and is confirmed before the visit.
What should you send us?
Send the address and a few photos of the floor, the doors, any cracks and the framing below if you can see it. We reply within one business day.