Delmhorst Instrument Accuscan - Manual (Page 7)

6
APPLICATION NOTES
USING THE 6-40% WOOD
SCALE
Testing Wood Flooring
hBefore installing a floor, make sure that the moisture
content of the sub floor and the flooring are within 2%-4%
of each other. Most flooring manufacturers also recommend
that the installer allow the floor to acclimate in its
environment for several days before installation. During this
period, check both the floor and the sub floor to ensure that
moisture levels of both materials remain stable.
Paint Failure and Moisture
hMoisture is by far the most frequent cause of paint failure.
The key to preventing paint failure is to make certain that
moisture is not absorbed through the wood to the back of
the paint film. So, in order to insure quality paint jobs,
wood must remain dry after the application of paint.
hOutdoor wood can be safely painted without danger of
peeling if the %MC is 15% or less. In drier climates, the
maximum reading should be 10% to 11%. Indoor wood
should be between 7% to 8% prior to painting.
Helpful Hints When Using
ACCUSCAN to Measure Wood
hThe entire sensor plate should be in contact with the surface
of the board. The sensor plate measures 2-1/2” x 3-1/2”.
hReadings obtained with Accuscan, like pinless moisture
meters in general, are affected by the amount of pressure
the sensor plate makes with the material under test.
Therefore, it is critical to apply and maintain uniform,
forward pressure to the meter when taking readings.
hThe sensor’s signal penetrates up to 3/4”. When measuring
thinner material, keep in mind that the material underneath
the wood may influence the readings. If possible, place a
piece of glass, rubber or styrofoam under the sample to
avoid false readings.
hThe meter works best on smooth lumber. Rough, uneven or
cupped boards yield low readings due to the air pockets
between the sensor plate and the surface. Disregard
readings on knots or splits.