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Notes:
1. Hardwood lumber is typically sold by the board foot, a unit
of volume equivalent to a board that is one inch thick, one foot wide and one foot long,
or 144 cubic inches. Lumber thickness is expressed in quarters of an inch, beginning with
1 inch, so that 1 inch lumber is designated as 4/4, 1-1/2 inch lumber is 6/4, 2 inch
lumber is 8/4, and so on. These units refer to nominal or roughsawn dimensions, not
surfaced dimensions.
2. This program rounds lumber thickness up to the next
1/4" and lumber less than 4/4 is rounded up to 4/4. Thus, a specified
thickness of 3/4" will be treated as 4/4" material.
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