Example: The RWS was calibrated on a laboratory
mock-up shown in Table 1. to indicate approximately
N.A.H.B moisture levels.
Structural Wood: 4” x 2” Stud
Sheathing:
1
/
2
” Plywood
Insulation: 1” Expanded
polystyrene
Lamina: Glass Fibre
Reinforced
Calibration was set on this as follows:
Table 1.
Comparison of RWS and Professional Pin Type
Resistance Meter Readings
It should be noted that calibration of the RWS in EIFS
MODE was based on the averaged results of numerous
on-site and laboratory tests. Therefore readings and
results vary depending on construction detail and from
site to site. The above chart was the result of tests con-
ducted on a simulated wall construction, as described
above and is for guidance purposes only. Readings from
the RWS are qualitative, not quantitative, and should be
used for comparative purposes only.
As EIFS systems, construction sites, environmental and
geographical conditions vary, results and readings will
vary also. It is recommended that when carrying out a
survey the RWS is zeroed on individual walls and any-
where the operator would expect a change in wall mate-
rials, lamina, surface moisture or other conditions that
may effect readings.
R.W.S.
User Guide
RWS
Setting of
Sensitivity
5
5
5
5
RWS
Meter
Reading
0
50
90-100
100+
Moisture Content of
Sheathing Taken With
Meter For Wood
% Moisture content
(Professional Meter)
14%
20%
28%
30%
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