Fire-retardant-treated wood is available in two treatments: Exterior Fire-X® and Pyro-Guard®. For interior applications, not exposed to weather or wet or damp locations in service, Pyro-Guard® is recommended. Exterior Fire-X® is recommended for weather exposed applications and can be used for most applications where fire retardant treated wood is allowed.
Pyro-Guard is pressure-impregnated, interior fire-retardant treated lumber and plywood for enclosed structural applications.
Exterior Fire-X is pressure-impregnated fire-retardant lumber and plywood that provides tested fire protection for applications directly exposed to the weather or high humidity, outdoors as well as indoors.