Delmhorst Instrument TechScan - Manual (Page 8)

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• The meter’s RF signal penetrates to ¾” – 1”. Material underneath or behind
the surface being tested may influence the readings. This includes metal
studs, wiring, and in the case of concrete, rebar and aggregate.
• The meter works best on smooth, clean surfaces. Surface moisture slightly
increases the readings. Wipe obvious moisture from the board surface to
minimize this effect.
• Testing Concrete Slabs for Flooring Applications
Pinless moisture meters can be an effective tool to check comparative
moisture conditions in concrete slabs. They can tell you where there may be
excess moisture and help determine if you need to conduct further testing,
and identify specific areas on which that testing should be performed.
TechScan cannot provide quantitative results as a basis for acceptance of a
slab for installation of moisture-sensitive flooring systems. ASTM Test Method
F2170 (RH using in situ probes), F1869 (calcium chloride), and F2420 (RH on
surface using insulated hood) provide quantitative information for determining
if moisture levels are within specific limits.
• Using TechScan In A Water Damage Restoration Or Mold Remediation
Job:
TechScan is a useful tool in identifying moisture in walls, ceilings and floors in
a water restoration or mold remediation. In order to establish pre-loss
conditions, find an area of the building that was not damaged and take
several readings on various materials. This will provide you with a “dry
standard” or target moisture levels when drying damaged areas.
Take several readings on each wall. Pay special attention near the base,
around doorjambs, electrical and plumbing fixtures, and other places where
water may have entered. Use the meter continuously during the drying
process to monitor drying progress.
• Testing EIFS (Exterior Insulation and Finishing System):
Moisture intrusion problems in EIFS (synthetic stucco) stem from leaking
window and door frames, improper use of or lack of sealant, and faulty
installation of flashing.