In nature, wood rot is a vital decomposition process, turning fallen logs into nutritious soil. But few things send homeowners into a panic as quickly as discovering it their homes because wood rot can lead to several structural problems, including deteriorated support posts and beams, rotted floor and ceiling joists, and destroyed roof decking. The cost to repair the damage—or, in other words, replace the rotted wood—can run in the tens of thousands of dollars. Because wood is the most prevalent building material, it’s essential to understand what causes wood rot, how to prevent it, and what to do if you discover it—discover being the operative word, as wood rot is often hidden from view beneath flooring, wallboard, and siding  - Glenda Taylor