Fire-Treated Material

Pyro-Guard® Fire-Retardant Lumber & Plywood

Hoover Pyro-Guard® is pressure-impregnated, interior fire-retardant treated lumber and plywood for enclosed structural applications. Also available in Exterior Fire-X®.

Pyro-Guard has been strength-tested after prolonged exposure to elevated temperatures and moisture to verify its strength characteristics when used in roof systems and other recommended applications.

Exterior Fire-X retardant treated wood is recommended for exterior exposures and other applications exposed to dampness, high humidity, or wetting.


  • Construction with Pyro-Guard treated wood requires no special tools or skills
  • Pyro-Guard trusses and roof decks often qualify a masonry wall building as “non-combustible” for insurance purposes
  • Use of Pyro-Guard wood partitions instead of untreated partitions often allows for an increase in square footage and lower insurance rates
  • Pyro-Guard was the first FRTW (fire-retardant treated wood) to be issued a Code Compliance Report based on high temperature testing for roof sheathing and framing uses

📽 Intumescent and Cementitious Fire Hazard Demo: