Fiber cement siding is a class of composite siding that is usually made from a combination of cement, cellulose (wood), sand, and water. They are either coated or painted in the factory or installed and then painted after installation. Fiber cement is popular for its realistic look, durability, low-maintenance properties, and fire resistance. Composite siding products containing cellulose (wood fibers) have been shown to have problems with deterioration, delamination, or loss of coating adhesion in certain climates or under certain environmental conditions.