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THE SCREED SCIENTIST


IT’S NOT ROCKET SCIENCE: PART 3


In his third instalment of screeding advice, the Screed Scientist takes a look at the definitive checklist for online supervision and the 10 major areas that must always be addressed.


From verifying the suitability of the screed specification before commencing screeding, to the post- installation measures of curing and screed protection, there are a number of areas where supervision and control are essential to ensure that the screed meets the expected quality and design standards. So, what are the all important screeding steps that need to be verified from start to finish?


1. Screed Specification • Check the suitability of the screed specifications against the BS Code of Practice requirements, and seek specialist advice in case of differences. For specialist screeds, make sure product data sheets are read in conjunction with BS8204 and BS8000.


• Check that the soundness category specified is suitable for the specified flooring and for the expected traffic and load.


2. Inspection of Structural Base • Check that the levels of the base


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substrate are suitable for achieving the specified minimum/maximum screed thickness.


• Check that any services that need to be incorporated in the screed are adequately detailed and positioned, so as to avoid disruption of the screed at a later stage.


3. Preparation • Check that appropriate surface preparation is carried out depending on the type of screed construction.


4. Screed Mix • Check that the raw materials and the mixing of screed are correct. The ideal mix proportion for normal cement/sand screeds is 1:3 to 1:5 – that is one part Portland Cement


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