Since many homes are built with a wooden infrastructure and may include other wooden components, annually checking for rot is just one way to protect your investment. The only reason wood rots is because at some time moisture entered its fibers. Moist natural fibers like wood become an environment for fungi to grow on. As they grow and multiply, fungi feed on wood, leather, paper, and other natural fibers. The result of fungi feeding on wood, a deck for example, is called wood rot. A buildings exterior is the most vulnerable place for rot to occur.
According to the Buyer's Choice Home Inspection Web site, "Most fungi need a wood moisture content of at least 20 percent to carry on." On average, most homes in the U.S. have a moisture content of between 6 percent and 16 percent. Fortunately, that is too dry for most microorganisms like fungi to get grow. However, homes and wooden structures in moist environments need to be checked periodically for rot.