The condition of the siding and any areas of high moisture are evaluated during this inspection. Typically, composition board siding is a paper-based product that is manufactured to replicate traditional wood siding at a fraction of the cost. Homeowners recently brought class action lawsuits against some of the larger manufacturers of this type of product. The homeowners claimed that the siding was susceptible to water penetration, which caused premature deterioration and rotting. According to the Environmental Protection Agency, some of the most commonly known manufacturers of composition board siding are Louisiana Pacific (LP), Georgia Pacific (GP), Masonite, and Weyerhaeuser.