What is required to cover rigid foam insulation board?

Rigid foam insulation board is typically required to be covered with gypsum wallboard for several important reasons. One key function of this requirement is to provide a fire-resistant barrier. Gypsum wallboard has a high fire resistance rating, which helps to reduce the risk of fire spreading through the building by protecting the insulation from direct exposure.

In addition to fire safety, covering rigid foam insulation with gypsum wallboard helps to enhance the structure's overall thermal integrity by preventing air movement and moisture accumulation between the insulation and the interior living space. This is important for maintaining energy efficiency, as unprotected foam insulation could become a source of heat loss or gain through thermal bridging.

Furthermore, using gypsum wallboard allows for finishing with paint or other decorative coverings, contributing to a more aesthetically pleasing environment in living spaces while also ensuring that the insulation complies with building codes and safety standards.