Screed Testing

Manchester Building & Testing Laboratories offer both physical on site screed testing and laboratory chemical analysis of the floor screed. We test all types of screed from traditional sand and cement screeds, proprietary screeds, anhydrite calcium sulphate screeds, polymer modified screeds and resin screeds.

The entire  flooring from the sub base, structural slab, levelling screed, smoothing finish to the  final floor finish can also be included. Our experienced personnel are able to tailor the investigations on site and recommend chemical analysis should it be more pertinent or supplemental to the physical testing.

Screed Failure

Problems can involve cracking, breaking up of the screed , indentations,  floor finish failures.

The BRE Drop hammer Test is an in situ crushing resistance (ISCR) test designed to test the strength and compaction of the screed as outlined in BS8204-1:2003 + A1:2009 Annex E. read more >

Relative Humidity (moisture content)

Manchester Building & Testing Laboratories can determine moisture content of the screed and sub floor  on site by testing the relative humidity in an insulated isolated pocket of air directly above the screed to BS 8203:2001+A1:2009. The Moisture content can also be determined by sealed samples which are then taken back to our laboratories.

Sub floor construction moisture , is a common problem which can affect the final floor finish , the rule of thumb is that it takes one month for each 25 mm of sub floor thickness.

Failure to ascertain the moisture content can adversely affect the final floor finish such as vinyl or Amtico etc., it can also adversely affect the application of a damp proof membrane ( DPM ) at very high readings.

According to BS 8203:2001+A1:2009  Experimental evidence has shown that when the measured relative humidity falls to 80 % the water has evaporated from the coarse pores and the screed is sufficiently dry to allow installation of resilient floor coverings. If some allowance is made for errors in determining the relative humidity, it is reasonable to recommend that the concrete be considered dry when the relative humidity falls to 75 % or less.

Site investigation of the screed

We can visually inspect the screed to document and investigate issues or check conformity to the relevant British or European Standards . Hollowness or debonding of the screed can be tested by experienced personnel using a metal tapping rod, cracks and problem areas can be assessed and their implications can be determined.

Our on-site testing team also have a scientific background so all tests and samples are taken with good laboratory practice in mind (no cross contamination, correct sample size and relevant sample location). Written notes are taken throughout with locations, descriptions and references being clearly marked with strict reference to all relevant British or European Standards. If litigation is then considered at a later date the testing procedure will stand the scrutiny of the courts.

Screed sampling

Laboratory analysis, samples can be taken by our onsite testing team or sent directly to out laboratories, to find out more please click on the link to our screed laboratory analysis. Read more >

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