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Thread #74

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by: richjames
March 14th, 2004
Lumber Volume
Running Versaverter with Knowledge Base on Win98.
I think I have found some errors in the Lumber Volume section.

1.  Versaverter shows 1 cubic foot = 71.9999999 board feet
This is incorrect.  A board foot is defined as the volume contained in the measure 1in thick x 12 in long x 12 in wide (1" x 12" x 12"), net measure.  There are, therefore, exacty 12 board feet in 1 cubic foot.

The reverse calucation is also wrong.
Versaverter shows 1 bf = 0.01388888889 ft3.
The correct answer is 1bf = 0.0833333 ft3.  (1 divided by 12 = 0.0833333)

2.  Versaverter shows 1 mbf = 13176 bf.  Incorrect.
By definition 1mbf (1000 board feet) = 1000.00 bf.

3.  Versaverter shows 1 yd3 = 1944 bf.  Incorrect.
1yd3 = 27 ft3 = 324 bf.

4.  Versaverter shows 1m3 = 2542.656004 bf.  Incorrect.
1m3 = 35.31466672 ft3 = 423.77599 bf.

5. Versaverter shows 1 ch (standard cord) = 9216.000001 bf.  Incorrect.
The legal unit of firewood measurement is the standard cord--a pile of wood stacked 4 feet wide, 4 feet high, and 8 feet long with a total volume of 128 cubic feet. (Stacked neatly by placing the wood in a line or a row, with individual pieces touching and parallel to each other, making sure that the wood is compact and has as few gaps as possible.)
The actual volume of wood in such a pile depends on the size the size and straightness of pieces and how they are split, but usually averages about 2/3 actual wood and 1/3 void space.
The actual wood volume in board feet therefore should be calculated as 128ft3 x .6666 = 85.3248 ft3 of actual wood.
85.3248 ft3 x 12 = 1023.8976 bf of actual wood.

In reality we would very seldom, if ever, convert from cords to board feet.
Board feet is a LUMBER (sawn lumber) measure and cord is a FIREWOOD measure, so firewood calcualtions should be in a separate catagory.
The cord conversions we would be interested in would be:
Cord to actual wood volume in cubic meters.
1 cord = 2.413092 m3 aprox of actual wood.
Cord to actual wood volume in cubic feet.
1 cord = 85.3248 ft3 aprox of actual wood.
These are the conversions we would use for calculating the amount of energy in a cord of firewood.
For calculating volume of firewood purchased or sold we would use the standard of 1 cord = 128 ft3.

6.  The lumber section has conversions for Cord of Softwood and Cord of Hardwood.  I am not aware of any measurement distinctions used in the trade for these two types of firewood.  I suggest you eliminate these 2 catagories.
Anyway, the conversions are wrong.
Versaverter shows 1 cord of hardwood = 5.763888888 ft3
Versaverter shows 1 cord of softwood = 5.763888888 ft3
Both should be equal to 128 ft3.

7.  These errors may effect some of the other conversions in the Lumber Volume section.

Richard A. James

Portrait for sbaker

by: sbaker
March 20th, 2004
Re: Lumber Volume
Thanks Richard - Ill look into this and get the data file updated...

Im concerned that there may be different definitions though - because I have some other emails from people indicating that what is there now is correct - and they quote fairly different definitions that you mention here.

- Ah, gotta love non-uniform-defns

Fair Winds, and watch for squalls from leeward.

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