Chicago Flameproof (866) 884-7591

Wisconsin Flameproof (866) 884-7593

North Texas Flameproof (866) 884-7594

Does OSB Plywood Have a Fire Rating?

MagTech OSB (Oriented Strand Board) is the material that contractors, architects and structural engineers choose to provide flame resistance and structural integrity to a building. This amazing product protects buildings from fire and smoke damage and is a cost effective solution to creating safe buildings that comply with even the strictest building codes.

OSB is made from combining rectangular wood strands and adhesives that are water-resistant. MagTech OSB gets its superior fire resistance due to its magnesium oxide coating that is applied via high pressure lamination. If both sides are treated, the OSB can even be used on exterior walls.

Does OSB Plywood Have a Fire Rating?

Chicago Flameproof’s MagTech OSB has undergone strict ASTM E-84 testing and has achieved a flame spread of 0 and a smoke development rating of 5. Additionally, it is code compliant with 1 and 2 hour testing on exterior and roof decks. The magnesium oxide coating causes no structural loss and it does not increase water absorption. In fact, it is water and mold resistant.

Interested in MagTech OSB’s superior fire resistance properties? Give Chicago Flameproof a call at (866) 884-7595 today! We offer onsite delivery across the United States.

Fire Treated

Wood graphicWe stock a complete line of lumber and plywood. We provide quick turn around on special order treated items.

Green Products

  FSC® Certified lumber and Plywood in Treated and untreated for all of your LEED projects.

Building Products


We specialize in non-combustible material and hard-to-find commercial industry items.

Chicago Flameproof

1200 South Lake Street
Montgomery, IL 60538
phone 866-884-7591
fax 630-896-4773

North Texas Flameproof & Wood Specialties Corp

4215 Chickasaw St.
Fort Worth, TX 76119
phone 866-884-7594
fax 817-534-9807

Wisconsin Flameproof

8530 West Calumet Rd
Milwaukee, WI 53213
phone 866-884-7593
fax 414-365-3674