Fortress Fortress 184204161 Ff Evolution Dbl Beam Track 4-ft (2 Pack)

4-in x 4-ft Double Beam. Frame System works with any type or brand of decking, including composite, PVC, aluminum, tile, wood and tropical hardwoods. Builds flat, stays flat. Designed for low-maintenance, durability, ease of installation and safety. Looks and installs like wood. A noncombustible material, resistant to fire and invulnerable to rotting, warping, splitting and pesky insect damage. Steel is recycled and recyclable, making it more sustainable than wood. Carries a 25-year limited manufacturer warranty.