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Concrete Encounter CME4
User Guide
CME4/0908
Working with your Concrete Encounter CME4
Drying time for concret floors and screeds
Concrete floors and screeds must be allowed to dry to an
adequate level before the installation of sheet material, tile,
wood or coating. Manufacturers of such systems generally
require moisture testing to be performed before installation on
a floor slab. Moisture content measurement is one such
method. Excessive moisture in or permeating from a floor
slab after the installation of a floor covering or coating can
cause failures such as condensation, blistering, delaminating,
movement and general deterioration of the finished
flooring/coating. There is also a risk of promoting microbial
growth.
No exact period can be specified for the drying of such floors
as this is affected by temperature and humidity within the
building as well as concrete curing times and other factors.
Typically a period of 3 to 4 weeks per 25mm (1inch) depth of
concrete or sand/cement screed needs to be allowed. Longer
periods may be required in areas of high humidity or low
temperature. During the drying period and prior to applying
the floor covering, the floor should be regularly checked to
monitor moisture content.
Testing for moisture content in a floor 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 artificial heating or drying equipment should be turned off
at least 96 hours before final readings are attempted,
otherwise results may not accurately reflect 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 any foreign substances.
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