Structural Lumber 4'' x 4'' (3 ½’’ x 3 ½’’) - Owens Corning
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Description
Description
Structural Lumber 4'' x 4'' (3 ½’’ x 3 ½’’) - Owens Corning
A premium, wood-free structural alternative designed to replace traditional pressure-treated lumber. Engineered from a high-density polyethylene polymer matrix reinforced with continuous glass fibers (Glas-Powered™ technology), they provide massive load-bearing capacities without the warping, twisting, or rotting typical of standard wood.
True Dimensions: Standard 4x4 posts feature actual physical dimensions of 3.5" x 3.5“
Surface Finish: Features a smooth finish on all four sides with a flat, uniform appearance
Rotproof and Insectproof: Completely impervious to wood-boring insects, mold, and mildew.
Submersible & Ground Contact Rated:
Approved for direct ground contact as well as long-term salt or fresh water exposure without requiring protective coatings, joint tapes, or sealers.
Standard Wood Tooling: Even though they are synthetic fiberglass-reinforced composites, they cut, drill, and accept fasteners using standard carpentry tools, job site practices, and structural connectors (such as standard Simpson Strong-Tie post bases).

