Pyro-Guard Fire Retardant Treated Lumber

	Wholesale Building Products for America

Overview
Pyro-Guard is pressure-impregnated, third-generation, interior fire-retardant treated lumber and plywood for enclosed structural applications.

Uses
Pyro-Guard is recommended for enclosed structural applications such as:

	Plywood roof sheathing
	Roof trusses
	Rafters
	Floor joists
	Mezzanines
	Shelving
	Load-bearing walls
	Floor sheathing
	Partition walls
	Studs
	Interior beams
	Blocking
	Steps
	Stairways
	Platforms
	Stages
	Plywood subfloors
	Wall sheathing
	Telecomm/electrical panels

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

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.

Pyro-Guard is the only major fire-retardant formulation produced by an American-owned company.

Pyro-Guard plywood span ratings and lumber design value adjustments are based on strength testing after prolonged exposure to high temperatures experienced in roof applications.

Pyro-Guard is used for interior structural applications such as ceiling and floor joists.

Pyro-Guard fire-retardant treated wood is produced in company-owned pressure treating plants that ship to the U.S. east of the Rockies. For the western U.S., Pyro-Guard is produced by licensee treating plants.

E-mail Hoover's Technical Service Department or request sales information.

Advantages

	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.
	Pyro-Guard can often be substituted for non-combustible materials without affecting building classification.
	Use of Pyro-Guard wood partitions instead of untreated partitions often allows for an increase in square footage and lower insurance rates.
	The use of Pyro-Guard wood roof decking is usually accepted in lieu of parapet walls in multi-family dwellings.
	Even when sprinklers are mandatory, the use of Pyro-Guard can further reduce fire insurance rates.
	Pyro-Guard is commonly accepted by building codes for partition walls, store fronts, fixtures and roof construction in shopping centers.

Strength
Pyro-Guard was the first interior fire-retardant treatment with plywood roof span ratings and lumber strength adjustments based on high temperature testing. Plywood was strength-tested after exposure to 170 degrees F, and lumber was strength-tested after exposure to 150 degrees F according to ASTM 5516 and ASTM 5664. As a result, Pyro-Guard can be used with confidence in all recommended structural applications, including plywood roof sheathing and roof trusses.

Fire Performance
Pyro-Guard is pressure impregnated deep into the wood to provide permanent protection, unlike coatings, which only provide superficial protection.

When Pyro-Guard treated wood is exposed to fire, non-combustible gas and water vapor are produced, and a layer of protective char forms, which hinders combustion and insulates the wood against further damage.

Pyro-Guard interior fire-retardant treated wood has a low rate of fuel contribution and heat release, and it maintains structural integrity longer than other building materials such as steel. Consequently, fire damages and repair costs are minimized, resulting in reduced insurance rates.

Smoke Toxicity
Pyro-Guard has successfully passed a stringent combustion toxicity test. Smoke produced by Pyro-Guard treated wood was no more toxic than smoke produced by untreated wood.

Pyro-Guard Material Safety Data Sheet 10/27/05

Exterior Fire-X Material Safety Data Sheet 10/20/05