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Code of practice for concrete bases and cementitious levelling screeds

  • Minimum compressive strength: 20 N/mm²
  • Surface regularity: SR2 (5mm under 2m straight edge)
  • Moisture content: ≤75% RH before flooring installation
  • Minimum thickness: 25mm unbonded, 15mm bonded
  • Level tolerance: ±15mm over entire floor area
  • Surface regularity: 5mm deviation under 2m straight edge
  • Thickness variation: ±5mm from specified thickness

Code of practice for the use of concrete, including steel-fibre-reinforced concrete, as a wearing surface

  • Minimum compressive strength: 25 N/mm²
  • Abrasion resistance class A2-A4
  • Surface texture according to application
  • Joint spacing: maximum 6m centres
  • Level tolerance: ±10mm over 3m
  • Surface regularity: 3mm under 2m straight edge
  • Thickness: ±10mm from design

Code of practice for terrazzo wearing surfaces

  • Aggregate grading to BS 882

  • Portland cement conforming to BS EN 197-1

  • Minimum thickness: 15mm

  • Curing period: minimum 28 days

  • Surface regularity: 2mm under 2m straight edge
  • Level tolerance: ±5mm over 3m
  • Thickness variation: ±3mm

Code of practice for synthetic resin flooring

  • Substrate moisture content: <75% RH
  • Surface preparation to achieve required profile
  • Temperature control during application
  • Contamination-free environment
  • Surface regularity: 1-3mm depending on system
  • Film thickness: ±0.1mm for thin systems
  • Coverage rate: ±10% from specification

Properties and requirements for screed materials and floor screeds

  • Compressive strength classes C12-C50
  • Flexural strength classes F3-F10
  • Wear resistance AR0.5-AR10
  • Thermal conductivity classification
  • Thickness tolerance: ±5mm
  • Surface flatness: SR1, SR2, or SR3
  • Level tolerance: ±15mm unless specified

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