When wood is exposed to water or high humidity for a prolonged period, its moisture content will increase, which can lead to swelling, warping, or bowing. In most residential and some commercial construction, the framing and subfloor are made from wood-based materials susceptible to water damage. When the wood swells it can cause permanent deformities as well as a host of cosmetic problems including cracked or separated drywall or uneven floors. 

Prompt drying by a certified professional prevents the wood from absorbing too much moisture, averting any permanent damage. Building materials should be dried in a controlled fashion, requiring regular monitoring to prevent over-drying and to return the wood to its natural moisture content.