Board foot
From Wikipedia, the free encyclopedia
The board-foot is a specialized unit of volume for measuring lumber in the United States and Canada. It is the volume of a one foot length of a board one foot wide and one inch thick.
Board-foot is abbreviated FBM (for "foot, board measure"). The unit MFBM represents a thousand board-feet.
In Australia and New Zealand the term super foot or superficial foot was used to mean the same.[1][2][3]
One board-foot equals:
- 1 ft × 1 ft × 1 in
- 12 in × 12 in × 1 in
- 144 in³
- 1⁄12 ft³
- 2360 cm³
- 2.360 liters
- 0.002360 cubic meters or steres
Board-feet are used for rough lumber (before drying and planing) with no adjustments.
For planed lumber, board-feet refer to the nominal thickness and width of lumber, calculated in principle on its size before drying and planing. Actual length is used.
See dimensional lumber for a full discussion of the relationship of actual and nominal dimensions. Briefly, for softwoods, to convert nominal to actual, subtract ¼ inch for dimensions under 2 inches (51 mm); subtract ½ inch for dimensions under 8 inches (200 mm); and subtract ¾ inch for larger measurements. The system is more complicated for hardwoods.
[edit] References
- ^ Rowlett ( . Y . ), Russ. "How Many? A Dictionary of Units of Measurement". http://www.unc.edu/~rowlett/units/dictS.html. Retrieved on 2007-01-30.
- ^ Burger, Les. "Cutting Timber on Springbrook in 1935". http://www.goldcoast.qld.gov.au/t_standard.aspx?PID=3398. Retrieved on 2007-11-06.
- ^ Holgate, Alan. "The Bendigo Monier Arch Bridges.". http://home.vicnet.net.au/~aholgate/jm/texts/bgobrshist.html. Retrieved on 2007-11-06.
