All woods absorb moisture when the air is humid, and lose moisture when it’s dry. You can manage the resulting expansion and contraction by understanding how the hardwoods behave, and by following a few simple guidelines for site preparation, handling, and installation.
QUICK TIPS
Take Moisture Content Seriously.
Changing moisture content makes a significant difference in the dimensions of solid hardwood products.
For example, here’s what happens to plain-sawn 2-1/4” oak flooring:
| Moisture Content Change | Approximate Width Change |
| 1% | .008 inches |
| 4% | .033 inches |
| 8% | .066 inches |