The materials should be thoroughly and efficiently mixed by means of forced action mechanical mixers, e.g. trough and pan paddle mixers and paddle mixers attached to screed pumps. The amount of water added should be the minimum necessary to give sufficient level of consistence for laying and thorough compaction.

To ensure uniform dispersion of admixtures, the measured dosage should be added to the water before mixing or at the same time as the water is added to the mix. When certain admixtures, e.g. superplasticizers, are added after mixing the concrete or levelling screed, the materials should be remixed thoroughly to ensure uniformity.

Free-fall drum mixers produce inconsistent mixing of low moisture content material and their use is not recommended for such materials.

A common problem is the use of too dry, badly mixed cement and sand screed materials that cannot be properly compacted, with the result that the levelling screed can have a dense crust with the underlying screed very weak and friable. The result of this has been for point loads to cause a crushing failure within the screed.

Interior Screed Ltd are the UK’s leading floor screeding contractors specialising in all types of floor screeding systems. Established in 2010 and working with many of the biggest and most prestigious names in the residential and commercial building sector’s we install screeds into building developments of all sizes. From complex large-scale commercial projects to residential and mixed-use contracts, we carry a comprehensive range of floor screeding products and services designed to offer our customers a one-stop floor screeding facility.

With 6 regional offices, we are uniquely positioned to provide a local service to our customers throughout the UK, promoting sustainable working relationships.

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