The growing threat of wildfires across North America underscores the urgent need for effective mitigation strategies. In response, many municipalities have begun implementing fire-resistant construction as part of their building code requirements for areas where structures are located near or within fire-prone lands. These areas are often defined as Wildland-Urban Interface (WUI) areas: geographical zones where structures and other human developments meet or intermingle with wildland or vegetative fuels. WUI area regulations and requirements significantly enhance a structure’s resistance to flame propagation and penetration through exterior walls and roof coverings.
RDH developed this document for ROCKWOOL in 2024 to serve as a guide to the evolving codes and to the use of stone wool insulation as a mitigation strategy. Stone wool resists ignition, hinders the spread of fire and the development of smoke, and strengthens a building’s ability to withstand fire. ROCKWOOL stone wool insulation products are noncombustible and have flame spread and smoke developed indices. The document outlines the applicability of these regulations and offers sample construction details that generally comply with these requirements.