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1" x 9-1/4" x 18" Prime Lam 4s LVL Exterior Stringer This engineered lumber stringer delivers consistent strength and stability for exterior stair applications. Manufactured from laminated veneer lumber (LVL), it resists warping, twisting, and splitting—common issues with solid wood. The 4-ply construction provides superior load-bearing capacity while maintaining dimensional accuracy across the full 18" length. Ideal for residential decks, porches, and outdoor staircases where weather exposure demands reliable performance. Prime grade ensures quality appearance suitable for visible installations.