Delmhorst Instrument BD-2100 - Manual (Page 6)

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hSiding and shingles without sufficient lap so that water is
forced up through cracks by wind pressure
hIce dams
hCondensation of vapor within hollow walls
EIFS (Exterior Insulation & Finish Systems)*
Moisture intrusion problems in EIFS (also known as
synthetic stucco) stem from leaking window frames,
improper use or lack of sealant, and faulty installation
of flashing.
If you suspect a problem take a visual inspection. Look for
gaps around windows, doors, air conditioning units, light
fixtures, hose bibs, dryer vents and other areas of potential
penetration. Also look for visible signs of water damage. If a
problem exists, use the
BD-2100 with a #21-E electrode.
This electrode includes the #608 insulated pins that penetrate
3 1/4
". Also available - #608/001 insulated pins with 6in.
penetration.
Procedure:
h Using a drill or the available HP-1 hole punch, make 2
(1/4") holes about 3/4" apart at an upward 450 angle.
h Push the #21-E Electrode into the holes through the
polystyrene and into the substrate.
h Set the meter to the wood scale #1 if the sheathing is
plywood. If gypsum sheathing is used, refer to the
gypsum scale #3.
h Press read button ! and read the moisture content on
the display.
TESTING GYPSUM/DRYWALL
h Set the scale for #3 Gypsum (measures gypsum %MC over
the range of 0.2% - 50%).
h Push the contact pins ^ into the gypsum to their full
penetration, if possible.
h Press the read key ! , and read the moisture content on the
display. The meter displays the reading for 2 seconds.
The set-point buzzer will sound if the displayed reading is
above the set-point value. Also, one of the LEDs on the front
panel will light up as follows:
Gypsum Scale #3
Green - 0% to 0.5% Yellow - 0.5 to 1% Red - > 1%
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The LEDs are a visual aid to help quickly determine the
moisture level that each reading indicates. Readings that
activate the green light indicate a sufficiently dry moisture
level, those that activate the yellow light indicate a borderline
situation, and those that activate the red light indicate material
that is too wet for painting or wallpaper.
USING THE 0-100
REFERENCE SCALE
When taking a reading on materials such as concrete, plaster,
or masonry, use Scale #2 to determine a
qualitative reading.
Tests should be made on areas that are known to be dry,
followed by readings on areas that are wet. These readings
can be used as standard or reference points, against which
subsequent readings are compared. All readings should be
evaluated in the light of factors such as type of paint, floor
coverings, construction, and climatic conditions.
The set-point buzzer will sound if the displayed reading is
above the set-point value. Also one of the LEDs on the front
panel will light up as follows:
0 -100 Reference Scale #2
Green - 0-85 Yellow - 85-95 Red - >95
The LEDs are a visual aid to help quickly determine the
moisture level that each reading indicates. Readings that
activate the green light indicate a sufficiently dry moisture
level, those that activate the yellow light indicate a borderline
situation, and those that activate the red light indicate
material that is too wet for most applications.
Testing Plaster Walls
Under normal drying conditions and proper application of plaster
(sufficient drying time between coats), surface readings give accurate
results. However, if rapid drying occurs, the surface of the plaster
may be dry, but moisture is still present below the surface and will
eventually affect the paint or wallpaper. This condition occurs when
there is high temperature or exceptionally good air circulation, or
where brown scratch and white coats are applied within a few
days.Take several readings on each wall. Pay special attention near
the base, around doorjambs, electrical and plumbing fixtures, and
other places where the plaster is thicker than normal.
Taking a Surface Reading:
h Drive the contact pins ^ into the plaster to their full
penetration, if possible.
h Press read key ! and read the meter.