Hardydeck SRL sawn lumber section

Rough Sawn Lumber in ipe, brazilian walnut, massaranduba, brazilian redwood, tigerwood and cuchi


Buying lumber in the international market requires sometimes conversions from cubic meter into linear meter or square meter and dealing with US orientated measuring system you will come across BFT (board feet) and sqft (square feet) the following is outlining which one is which:


Rough sawn wood boards

A board foot measures one square foot that is one inch thick. A cubic foot has 12 board feet. So, to figure out board feet in rough sawn lumber, you multiply the thick (inches) by the width (inches) by the length (in feet), and divide by 12. The formula would look like this: (Thickness * width * length) / 12


A 1" x 6" x 8' (=1x6x8=48/12) would have 4 board feet.


Buying and selling logs

When it comes to trees, there are several ways to measure them. You can use a cubic foot volume (not used much), a cord volume (which has 128 cubic feet on a standard cord), by the ton, or by the board foot. None of these are really transferable in the mathematic sense from one to the other.


To top things off, there are several types of scales used to determine the amount of board footage in a tree or a log. You will see terms like Doyle, Scribner, and International scales used in various threads. They estimate volume, and you can't say that so many feet in Doyle is equal to so many feet in Scribner. Which scale is used varies from one place to the other.


Overrun and underrun in milling

The next problem is that 1,000 board feet in tree scale will have more footage in log scale, even using the same scaling techniques. And, you will normally cut more lumber out of a log than what it scales at. They call that overrun. If you go under, its called underrun.


Commercial and (FSC) official log measuring

In Bolivia there is two types of measurements, one is commercial (without the sapwood and holes) and the other is according to the authorities, including sapwood and bark. Since a log is conical, there are two ends of the logs which are not equal in diameter. The end closer to the top is less in diameter and the end closer to the ground is wider in diameter. Using the commercial way of measuring the calculation is the following:


diameter 1 in cm x diameter 2 in cm x length in cm x 0.7854 and everything dived in 1,000,000

so if your log is 44cm x 47cm (excluding holes and sapwood) x 400cm, the volume of this log is 0,650m


using the measurement used by the authorities the difference is that you need to measure both ends of the log and include the sapwood and the bark (we take for this example the same log):


log end 1: diameter 1 in cm x diameter 2 divided in 2


log end 2: diameter 1 in cm x diameter 2 divided in 2


length x 0.7854 = volume of the log.


Example: 49cm x 53cm/2 x 54cm x 66cm/2 x 400cm x 0.7854 = 0.961m


it is obvious that using the second method which included the sapwood and bark turns out to be more in volume m.

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Hardydeck Rough Sawn Lumber in ipe, brazilian walnut, tigerwood, massaranduba, brazilain redwood, and cuchi

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