What Is Fire Treated Wood? A Beginner’s Guide
A Beginner’s Guide To Fire Treated Wood
When safety and building performance matter, fire treated wood (FRTW) plays a critical role. But what exactly is fire treated wood—and why is it used in construction?
Let’s break it down.
What Is Fire Treated Wood?
Fire treated wood (aka fire-retardant wood) is lumber that has been chemically treated with fire-retardant preservatives, then kiln-dried to reduce its flammability. This treatment helps the wood resist ignition, slows flame spread, and minimizes smoke production.
In essence, fire treated wood buys valuable time in a fire—time that can protect lives and limit property damage.
How Is Fire Treated Wood Made?
The process involves:
- Pressure-impregnating the wood with proprietary fire retardant chemicals.
- Drying the lumber in a kiln to reduce moisture and maintain dimensional stability.
- Testing and certification to meet standards set by the International Building Code (IBC), National Fire Protection Association (NFPA), and other authorities.
Where Is Fire Treated Wood Used?
FRTW is commonly used in:
- Multifamily housing
- Commercial buildings
- Exterior walls (Type III construction)
- Stairwells, hallways, and exit corridors
- Roof assemblies and eaves
These are all areas where added fire resistance can make a crucial difference.
Advantages of Fire Treated Wood
- Meets building code requirements
- Lightweight and easy to work with
- More cost-effective than steel or concrete alternatives
- Available in dimensional lumber, plywood, and more
Why It Matters
With increasing fire safety regulations and heightened awareness around wildfire risks, FRTW is not just an option—it’s often a necessity.
At Biewer Lumber, we manufacture fire treated wood to meet today’s toughest safety and performance standards. Learn more about our FRTW products here.
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