What Is Dry Rot?

Dry rot is a breakdown of wood caused by a fungus, which affects the cellulose and hemicellulose in the wood. Despite the word “dry” in the name, the fungus that causes dry rot typically grows when the moisture in the wood exceeds 20 percent, or when the wood is exposed to sitting water or extreme humidity. Dry rot is often confused with wet rot but is easy to identify. Wet rot is identified by wood that feels wet to the touch or that has a musty smell and feels soft and spongy. Dry rot can occur after a flood, natural disaster, plumbing accident, in humid climates, or when wood is not properly dried before being used. Preventing dry rot is essential, and it can be achieved by keeping the wood inside and outside the home free from excess moisture and water exposure.