Floor Screeds must be moisture tested using the CM Moisture Test Method before laying sensitive floor coverings. This can be completed with either a Tramex CRH Meter (non-destructive) or using a Calcium Carbide Moisture Tester (destructive) before laying sensitive floor coverings.
The residual moisture in the screed should be less than 3% before laying permeable floor surfaces such as stone and ceramic tiles and less than 2% before laying sensitive floor coverings such as vinyl, linoleum, parquet etc.
Watch our video of a Calcium Carbide Moisture Test.


The strength testing method for Floor Screeds is a BRE drop hammer test in compliance with the current standard of BS8204:1 2003 and it is designed to measure the soundness of the floor screed as early as 14 days after laying.
The device consists of a 1m long cylindrical guide rod along which an annular weight of 4kg (for Categories A and B), or 2kg (for Category C), travels when released. At the bottom of the guide rod the weight strikes the collar of a case hardened steel anvil which transmits the impact to the selected area of screed. Four successive impact blows on the same spot are sufficient to create an indent in the screed. The depth of the indent determines the strength of the screed.

The Pull Off Adhesion/Bond Tester measures the adhesion of coatings to screeds. The Tester measures the pull force used to pull a 2” or 3” disc away from the material being tested with the pressure displayed on a precision gauge which can be related directly to the strength of the adhesion to the surface being tested.
Test prisms of the screed mixture being used in an installation are taken, typically measuring 160mm x 40mm x 40mm, and these are tested both at 7 days and at 28 days after moulding to determine the flexural strength of the screed.
Further tests are available on application. Please contact the office for further details.
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