Treated Wood, Done Right

Decades of experience delivering high-performance treated wood nationwide.

Featured Products

  • A multi-story building under construction with exposed wooden framing against a clear blue sky.

    D-Blaze® Fire Retardant Treated Wood

  • Stacked sheets of particle board or drywall with a white surface, labeled 'Intertek' and 'ETL'.

    MagTech™ Fire Retardant OSB Sheathing

  • A wooden backyard deck with steps, patio lights, a bench, and potted plants, surrounded by green trees and shrubs.

    Wolman E MCA

  • Construction framework with wooden beams and screws, showing a partially built wall or roof in progress.

    FrameGuard

About Flameproof Companies

Since 1971, Flameproof Companies has been manufacturing fire retardant and preservative treated wood products built to perform when it matters most. What started as a small treatment facility in Chicago has grown into a nationwide operation, with manufacturing and distribution facilities in Wisconsin, Texas, and Virginia.

Today, The Flameproof Companies specializes in high-performance treated lumber, plywood, OSB, and engineered wood products—delivering reliable solutions for demanding commercial, industrial, and code-driven construction projects across the country.

Learn more

Contact Us

Have questions about our products, services, or capabilities? Contact Chicago Flameproof to connect with our team. We are here to provide expert guidance, fast responses, and the support you need to keep your project moving.