Giving you the Edge in Business

New Brunswick does make some allowance for scaling based on FBM. This allowance is primarily for private contracts on non-Crown land.

As the New Brunswick scaling manual states: "The New Brunswick Log Scale (commonly referred to as the NB Log Rule) does not conform to CSA Standard 0302.1-09. It is a diagram rule, as opposed to a mathematical or formula rule, and was devised more than a century ago. Use of the NB Log Scale was discontinued on NB Crown lands in 1995. This method of scale, however, remains regulated for primary forest products harvested from private woodlots and which are marketed through a Producer Association."

"The NB Log Scale (see the table below) displays the amount of lumber in board feet, which may be sawn from logs of different sizes under certain assumed conditions. It is an approximation of manufactured volume. Some influences that may affect actual volume sawn include changes in market requirements, machinery, sawing practices and the skill of the sawyer and / or edgerman."

"The scaling of primary forest products, in board feet, requires the measuring and recording of the length of the log in feet, and the diameter, inside bark, of the top end in inches. The length shall be measured from the point of any scarf (cut or notch) at the butt to the top end and recorded to the nearest foot. The diameter at the top end, inside bark, shall be recorded to the last full inch after dropping all fractions. Any log having a length greater than those lengths prescribed in the table below shall be scaled as two or more logs with a taper of one inch per eight feet of length."

The New Brunswick Log Scale was adopted by Provincial Statute in 1854, for logs 12 inches top diameter and larger, was derived from diagrams by plotting circles for the various diameters and reckoning the number of one-inch boards that could be sawn, using a 5/16-inch saw kerf. The resulting board-foot volumes were used without curve-fitting to remove irregularities.the number of one-inch boards that could be sawn, using a 5/16-inch saw kerf. It is interesting to note that the rule was adopted just a few years after the introduction of the Scribner rule using Scribner's methodology, albeit with a somewhat greater allowance for saw kerf (5/16" vs 1/4")

Note on Nova Scotia Nova Scotia use the New Brunswick FBM table for log scaling.
There is one caveat in scaling long logs: Logs longer than 18 feet shall be scaled in two or more lengths. These long logs should be scaled in approximately equal lengths. If the log is an unequal number of feet in length, the “extra foot” should be included on the butt long, unless defects on the log would make it practical to do otherwise.

The table itself is somewhat of a mishmash
For logs
Diam 5": Vol = Length - 2
Diam 6": Vol = Length + 3
Diam 7": Vol = 2 x Length - 1
Diam 8": Vol = 2.5 x Length
Diam 9": Vol = 3 x Length
Diam 10": Vol = 4 x Length
Diam 11": Vol = 5 x Length
Diam 12": Vol = 6 x Length
Diam 13": Vol = 7 x Length
Diam 14": Vol = Diam² x Length / 24 = Vermont Rule
Diam 15": Vol = Diam² x Length / 24 = Vermont Rule
Diam 16": Vol = Diam² x Length / 24 = Vermont Rule
Logs >= 25" Basically follows the Maine Table Rule
I don't know how the other entries were calculated.

Two Segment Logs
The following table shows the breakdowns of Lengths and Diameters for logs over 23 feet.
The lengths are split evenly, with the odd foot assigned to the butt end.
For example, take a 31' log with top diameter of 14". We divide by two, which gives us 15' with remainder of one.
So, we split the log into two segments of 15', but because of the remainder, we make the butt log 16'. In the table, each length class has two segment lengths; the top row is the top diameter and the second row is the butt diameter.
Now for the diameters, we need to allow for 1" of taper for every 8' in length.
So, for our 31' log, the top diamater is 14". Becuase the first segment is 15', we need to add one, yielding a top diameter for the butt segment of 15". If the top segment had a length of 16' (instead of 15'), we would have added two imches for a diameter of 16". We add two inches because 16' divided by 8' equals 2.

The following table is the Volume Table for the two-segment logs. The table is constructed by doing a lookup from the basic table for each of the two segments. For example our 31', 14" diameter log has two segments of 15' (14" diameter) for the top and 16' (15" diameter) for the butt. In the base table lookup for these segments, the volumes are 122 and 150, respectively, yielding a total of 272 FBM.