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ADVICE ccessful flooring installation, says Norcros Adhesives.


The principal advantage is that anhydrite screeds can be laid more quickly and easily than traditional sand: cement screeds and are more cost-effective especially for larger areas. They will self-level and


offer minimal shrinkage, making them especially suitable for use with underfloor heating systems, where they will fully encapsulate all pipework. Up to 2,000m2


can be laid in a single day – compared to 100-150m2


is the maximum possible with conventional sand/cement screeds, making them particularly suitable for use on large commercial contracts.


However there are a number of disadvantages associated with this type of screed, mainly associated with the extended drying time. Typically sand/cement screeds should be allowed to dry for a minimum of 21 days before they are able to receive a tiled finish as per the recommendations contained within BS5385- 3:2014. To achieve the required maximum relative humidity of 75%, the minimum drying times quoted for anhydrite screeds before tiling can commence are one day per mm up to 40mm thickness, with an additional two days per mm thickness above 40mm according to BS8204-7:2003.


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of anhydrite screed which


In ideal drying conditions therefore a 40mm thick screed should be allowed to dry for a minimum of 40 days, at 50mm thick the minimum drying time would be 60 days and at 60mm thick a minimum of 80 days drying time would be required before the screed was sufficiently dry to receive a tiled finish. Failure to follow these recommendations and tiling before the screed is sufficiently dry will generally result in adhesion failure at the screed/adhesive interface.


Norcros Adhesives’ fast-track system is a complete game changer in terms of the drying times required. The new preparation systems now coming on to the market make it possible to tile with a cement-based adhesive on to anhydrite screeds which have a relative humidity as high as 95%. This can normally be achieved in just seven days, at which point tiling or the installation of another type of finish can commence.


It can reduce the time required for the overall build-up of the floor surface by 10 weeks, which clearly has a very significant impact on timescales and costs on-site.


The Norcros Adhesives product includes all the required elements – a primer, a moisture suppressant and a gritted primer to provide a ‘key’ on to which the ceramic tile adhesive can form a strong bond.


The adoption of one of these new systems will allow contractors to derive all the benefits of rapid and easy pouring of an anhydrite screed, without involving delays on the job caused by having to wait for an extended drying period.


www.norcros-adhesives.com SUBFLOOR PREPARATION | 49


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