Spring storms
Flash flooding and saturated soil can trigger sudden settlement.
01Signs worth a call
Doors that stick only in summer or only after rain, cracks wider at one end, brick separating from window frames, and floors that slope enough to notice when walking. Gaps between ceiling and wall that open and close seasonally also mean movement.
02Usually harmless
Fine hairline cracks in garage slabs, small drywall cracks at corners in a new house, and nail pops. Watch them, photograph them, and see if they grow.
03Track it yourself
Mark crack ends with a pencil and date them. Note which doors stick and when. That record helps whoever does your evaluation, and helps decide whether you need slab foundation repair or just patching.