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Commentary on Species cont’d…
graded under the Dense rules. If the
specic gravity of a lumber sample
is known, species adjustment can be
determined by the species adjustment
equation.
The species adjustment equation provides
a way to expand the use of your Wagner
Hand-Held Moisture Meter for lumber of
any species groups having similar species-
specic gravity values. One example is
Hem-Fir. For a species group, one way
to determine the species adjustment is
by the use of a weighted average of the
individual species’ average specic gravity
values. The weighing procedure used in
the ASTM D2555 by standing timber
volume can be used. Species adjustment
is not recommended for any species group
having a broad range of species-specic
gravity values. There are no recognized
limits on species group species adjustment.
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