Sand Cement Floor Screed mixes are a more traditional and well established screed option comprising of washed sand and cement mixed at ratios of 1:3 to 1:6 with a 1:4 mix being the most common.
All our sand and cement screeds can be modified to come reinforced with polypropylene fibres to improve the performance of the screed and or the setting time can be retarded for up to 10 hours so that the amount of screed material for a full days screeding can be delivered to site in one drop.
There are many applications where sand cement floor screed mix is effective and it is ideal for situations where the floor is laid to falls, such as wet rooms that contain drainage slopes within the floor area.
The screed is weigh batched and mixed in our wet batch plants and can be collected ex works or delivered to site in tipper or concrete trucks ready for laying. Depth of screed can vary depending on the type of system and end use;
Bonded screed depth = 40mm and is laid on shot blasted or mechanically scabbled base and bonded with an adhesive such as PVA, SBR, Epoxy or cement slurry laid wet on wet.
Unbonded screed depth = 50mm, laid on a DPM to intentionally debond the screed from its base.
Floating screed depth = 75mm, laid on a DPM that is overlaid on insulation (commonly used for underfloor heating systems).
In all cases it is recommended that internal pillars, islands, internal walls and surrounding walls should be isolated using a 10 to 20mm wide strip of edging foam or insulation, to the full depth of the screed. Screeds must be protected against moisture loss and it is essential to ensure immediate curing by using a suitable curing membrane, covering with plastic or spraying with water.
Sand and cement screeds are not meant to be wearing surfaces and should be covered with an appropriate floor covering.
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