Why floors creak
Creaking usually comes from wood boards rubbing against each other or against fasteners as they flex slightly under weight. This can develop over time as the subfloor and boards naturally shift, or if boards were installed with insufficient fasteners or a subfloor that has some flex in it. Creaking on its own, without other symptoms, is usually cosmetic-level annoying rather than a structural concern.
Why gaps appear between boards
Wood expands and contracts with humidity — gaps commonly widen in winter (when indoor air is drier from heating) and close up somewhat in humid summer months. Small seasonal gaps are normal for solid hardwood. Gaps that appeared suddenly, are unusually wide, or don't close up at all in humid months are worth a closer look.
What you can control
Keeping indoor humidity in a consistent, moderate range (many recommendations target roughly 35–55%) reduces the seasonal expansion and contraction that drives both creaking and gapping. A humidifier in dry winter months and a dehumidifier in humid months can meaningfully reduce both symptoms over time.
When it's more than normal movement
- Boards that feel soft, spongy, or visibly sink underfoot (possible subfloor damage, often water-related)
- Cupping (edges of boards higher than the center) or crowning (the opposite), both signs of a moisture imbalance between the top and bottom of the board
- Gaps that appeared suddenly in one specific area rather than gradually across the whole floor
These patterns are worth having a flooring professional assess, since they can point to a moisture source under the floor rather than normal seasonal movement.
Not sure which one applies to you?
Describe what you're seeing to Queen and get a sense of whether it's normal or worth a closer look.