Humidity & Climate
Why do hardwood floors cup or gap in Florida?
Hardwood floors cup or gap in Florida because of moisture: too much moisture (from a slab or humid air) makes boards swell and cup, and too little makes them shrink and gap.
Cupping — edges higher than the center — means the underside of the board is wetter than the top, often from slab moisture or high indoor humidity. Gapping is the opposite: the wood has dried and shrunk.
The fixes are prevention-first: test and control slab moisture before installing, keep indoor RH in range, and acclimate the material properly. Where damage has occurred, we find the moisture source before repairing, because replacing boards without solving the cause just repeats the problem.
We give free in-home estimates across the Gulf Coast. Request one or call (941) 666-0138.
Related answers
What indoor humidity should I keep for hardwood floors in Florida?
Keep indoor relative humidity between about 30% and 50% year-round to keep hardwood floors stable — in Florida that means running air conditioning and, in some homes, a dehumidifier.
Read more →What happens to hardwood floors in a seasonal home left empty in Florida?
A hardwood floor in a seasonal Florida home can cup, gap, or move if the house is closed up without humidity control, so leave the air conditioning or a dehumidifier running while you’re away.
Read more →How do you prevent mold under wood floors in Florida?
Mold under a Florida wood floor is prevented by controlling slab and air moisture — a tested slab, the right vapor barrier, and indoor humidity kept in the 30–50% range.
Read more →