Rounding Numbers when Figuring Board Feet
From Professor Gene Wengert, forum technical advisor:
For hardwood lumber, the answer is always given to the closest BF. This means rounding up or down to the closest whole number as appropriate. When the answer is exactly on the half BF (that is, at x.50 BF), then the instructions are to go up the first time, down the next, up the next, then down, etc. It is incorrect to always go up; the rules are clear. Note that softwood lumber is reported to x.xx.
From contributor D:
I see that Gene answered your question, but you could Google "Illustrated Grading Guide" and download the PDF file for an extensive explanation on NHLA grading and measuring rules. It is not the complete set of rules but it should answer most questions you would have. It is very informative with lots of pictures of different grades and species.
From the original questioner:
Thanks for the information. The above website has great illustrations. I will print it and keep it with my sawmill information.
From contributor P:
The way we round numbers in engineering is:
Less than 0.5 you go down to the next lowest whole number
Greater than 0.5, you go up to the next whole number.
Exactly equal to 0.5, you go whichever way makes the number even, i.e.
6.5 rounds down to 6
7.5 rounds up to 8
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