long life Ground nstruction mats 2×6 ft for nstruction-HDPE Jan 13, 2022 · 2 in. x 6 in. x 8 ft. Must use Ground ntact pressure treated lumber where lumber is at risk for poor air circulation, less than six inches from the ground, or has poor or no water drainage below the structure. #2 grade lumber has few defects, knots are well-spaced and