structural lumber

Lumber consisting of the following classifications: 1.Beams and stringers : Lumber of rectangular cross section, 5 in. or more thick and 8 in. or more wide; graded with respect to its strength in bending when loaded on the narrow face. 2.Joists and planks : Lumber of rectangular cross section, 2 in. to (but not including) 5 in. thick, and 4 in. or more wide; graded with respect to its strength in bending when loaded either on the narrow face as a joist or on the wide face as a plank. 3.Posts and timbers: Lumber of square or approximately square cross section 5 in. by 5 in. and larger; graded primarily for use as posts or columns carrying longitudinal load but adapted for miscellaneous uses in which strength in bending is not especially important.

单词	structural lumber
释义	structural lumber structural lumber Lumber consisting of the following classifications: 1.Beams and stringers : Lumber of rectangular cross section, 5 in. or more thick and 8 in. or more wide; graded with respect to its strength in bending when loaded on the narrow face. 2.Joists and planks : Lumber of rectangular cross section, 2 in. to (but not including) 5 in. thick, and 4 in. or more wide; graded with respect to its strength in bending when loaded either on the narrow face as a joist or on the wide face as a plank. 3.Posts and timbers: Lumber of square or approximately square cross section 5 in. by 5 in. and larger; graded primarily for use as posts or columns carrying longitudinal load but adapted for miscellaneous uses in which strength in bending is not especially important.
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