Industrial grade is the lowest common board grade. It admits large characteristics in any combination as long as the piece is usable full length. This material is generally used in rough construction where strength and appearance are not of primary importance.
This grade allows large characteristics in any combination as long as the full length of the board is useable. Sound and unsound knots, shake, checks, pitch, pitch pockets, hit or miss dressing, pith, stain, warp, knot holes, bark and pitch, seams, wane, skip, and worm holes are allowable. Any characteristics which seriously weaken the piece for reasonable handling will not be permitted. The splits in this grade cannot exceed 1⁄4 the length. Advanced decay is limited to no more than 1⁄2 the surface area.
Refer to the NELMA Standard Grading Rules for Northeastern Lumber booklet for complete detailed information on all Eastern White Pine lumber grades.