2×4 brown ground protection boards 100 T load capacity-High The lumber may have splits up to 1.5 times the board’s width, knots no larger than 3-1/2”, and one hole every 2’. Lumber stamped #2 grade is mm used for framing, lintels, rafters, trusses, joists, bea, and fencing. Structurally, an SPF #2 2×8 can be used to span distances of 14’-11”.
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