Instructions / Assembly

9
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:
hDrive the contact pins ^ into the plaster to their full
penetration, if possible.
hPress read button
! and read the reference scale.
Taking a Reading Below the Surface:
hDrive a pair of nails into the plaster at least 1/3 of the
total thickness of the plaster. If you are applying plaster
to a material of doubtful dryness, such as brick or con -
crete, drive the nails through the plaster and into the
brick or concrete.
hTouch the heads of the nails with the contact pins
^ and read
the meter.
Testing Concrete Slabs for Flooring
Applications
Moisture meters are an effective tool to check moisture in
concrete. They can tell you where there may be excess moisture
and help determine if you need to conduct further testing.
It is important to test both the surface and mid-section of the
slab, especially if the slab is on or below grade. This will help
determine if there is continuous moisture migration toward
the surface. If this condition exists, the moisture movement
may be so slow that once it reaches the surface, moisture
evaporates and causes a “dry” reading when a surface test
is made.
However, if a sub-surface test is made, the meter may read
“wet” indicating the presence of moisture. When the slab is
covered and the upward movement of moisture continues, moisture
will move into a hygroscopic (wood) floor, or build-up pressure
under a non-breathing synthetic floor, causing delamination.