TRAMEX CMEX II - Testing for moisture content in a floor slab; Pre-test Conditioning and Preparation; Pre-testing Guidelines

USER GUIDE
14
During the drying period and prior to applying the oor
covering, the oor should be regularly checked to monitor
moisture content.
Testing for moisture content in a oor slab
Pre-test conditioning and preparation
For best and most accurate results, tests should be carried
out after the internal conditions of the building in which
the slab is located have been at normal service temperature
and humidity for at least 48 hours. All articial heating or
drying equipment should be turned off at least 96 hours
before nal readings are attempted, otherwise results may
not accurately reect the amount of moisture present or
moisture movement in the slab during normal operating
conditions. Prior to testing, the actual test area should be
clean and free of foreign substances.
Pre-testing guidelines
Where covered oor slabs are being tested, all covering
materials, adhesive residue, curing compounds, sealers,
paints, etc., shall be removed to expose a test area of clean
bare concrete. For removal of any existing ooring or
adhesives, strictly observe all the appropriate safety and
health practices relevant to cleaning and removal of these
types of materials. Removal of covering materials and
cleaning, if required, should take place a minimum of 48
hours prior to testing. Use of water based cleaning methods
that could lead to elevated surface and/or sub-surface
moisture levels in the oor slab are not recommended, and
the testing after such treatment could result in elevated
readings. No visible water in liquid form should be present
on the concrete at the time of testing. Avoid testing in
locations subject to direct sunlight or sources of heat. Use
of articial aids for accelerated drying of concrete is not
recommended. If they are being used it is recommended
they should be turned off at least four days before taking
nal readings.