Foam siding backer board must be separated from the interior of the building by at least how many inches?

Foam siding backer board must be separated from the interior of the building by at least 2 inches to ensure compliance with fire safety regulations and to minimize the risk of fire spread. This separation distance is crucial because foam materials can be highly flammable and, if too close to the interior, could pose a significant fire hazard.

Maintaining a 2-inch gap not only allows for sufficient space to reduce fire risks but also helps in managing thermal insulation properties and prevents moisture accumulation between the foam and the building structure. This is a common requirement in building codes to ensure that all insulation and siding products are installed safely and effectively, contributing to the overall safety and performance of the building.