Decreasing Risk of Structure-to-Structure Fire Spread in a Wildfire

This technical guidance document provides recommendations to reduce the risk of structure-to-structure fire spread in wildfire-prone areas, focusing on residential and commercial buildings. It analyzes vulnerabilities in building components such as roofing, wall assemblies, vents, glazing, and attachments, and offers mitigation strategies including the use of fire-resistant materials, improved construction practices, and appropriate building spacing. The document is based on findings from the Marshall Fire Mitigation Assessment Team's evaluation of building performance during the 2021 Marshall Fire in Colorado. It is intended for contractors, designers, and community officials involved in new construction or retrofitting in the wildland-urban interface.