Self-levelling floor screed technical information.

EXPRESS SCREED
SAND AND CEMENT
ANHYDRATE FLOWING SCREED
Walkable Surface
Seven days needed for both covering and curing
24–48 hours after placement, no curing required
Surface Finish
Achieved tolerance of +/- 10mm under a 2-meter straight edge
Achieved tolerance of +/- 5mm under a 2-meter straight edge
Performance
Prone to shrinkage, cracking and curling
Very low shrinkage and cracking. Will not curl
Strength (28 days)
Compressive: 10-20 N/mm3
Flexural: 4-8 N/mm3
8–28 days to reach 90% strength
Compressive: 30 N/mm3
Flexural: 8 N/mm3
7 days to reach 90% strength
Drying Time
1mm per day up to 40mm, ½ mm per day thereafter
75mm takes significantly longer to dry
Can’t be force-dried
1mm per day up to 40mm, ½mm per day thereafter
Can be force-dried using heater and dehumidifier
UFH can be commissioned after 7 days
Quality Control
Often mixed and placed by hand
Labour intensive and inconsistent
Produced to fully verifiable industry standards
Conductivity
1.1w/m2k
2.2w/m2k – faster heat reaction time
10% saving on running cost

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