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Calcium Sulphate/Anhydrite screeds
These types of screed are mixed much wetter than conventional sand/cement screeds in order to be pourable and self-levelling. This means that whilst installation of the screed is much quicker, due to the much higher water-content, curing times are much longer.
These screeds must be cured thoroughly to their respective manufacturer’s recommendations before tiling can begin as they retain moisture for longer periods than conventional sand and cement screeds.
Approximate curing allowances are 1 day per mm thickness of screed up to 40mm and 2 days per mm for any additional thickness over 40mm, however, the screed manufacturers should be contacted for their recommendations.
It is important to use the correct adhesive with these screeds.
Download Granfix CSA adhesive PDF