Cellulose/ Fibre cement building board, specifically designed as a carrier board for polymer modified render systems where no insulation is applied to the board prior to rendering, for new timber frame rendered facades. For projects where insulation is applied first, RCM Cemboard, Multipurpose, Y-Wall or CEM+ are suitable alternatives.

Designed to achieve a strong key between polymer basecoats/ topcoats and the Renderflex. CE marked and conforms to BS EN 12467.

Key applications:

  • Render carrier board.
  • Internal and external wall linings.


  • Dimensional stability.
  • High tensile strength for long term durability.
  • Excellent weathering properties for exposure prior to render application.
  • Impact resistance.

Approved by many of the UK render manufacturers. Please contact RCM for further information.

Standard product features


1200 x 2400 mm.


  • Smooth front and textured back face.
  • Nominal density: 1380 kg/m³.
  • Bending strength (Modulus of Rupture): 18.8 Mpa.
  • Modulus of Elasticity (MoE): 5.5 GPa.
  • Thermal conductivity: 0.47 W/mk.
  • Fire rating (BS 476-6 and -7): Class 0.
  • Frost resistance: Five star.
  • Fungus and termite attack: Highly resistant.
  • Durability (minimum): 30 years.


Recommended fixings:

5 x 32 mm or 41 mm Climaseal fixing, 15 mm from edge.

NBS Specification

NBS Create logo
This product is associated with the following NBS Create clause:
45-45-50/355 Fibre reinforced cement board

Product specification

An important note about specifying



RCM - Roofing and Cladding Materials Ltd


+44 (0)800 6124662

Product reference



[6 mm]
25 dB sound insulation.
[9 mm]
28 dB sound insulation.
[12 mm]
30 dB sound insulation.


[RCM Foil Tape]
Waterproofing seal.
[RCM Intusil]
Neutral cure sealant for use in gaps and joints.
[RCM Joint Seal]
Air tightness seal.

Manufacturer details

Units 25-26 Rosevale Road,
Parkhouse Industrial Estate West,
Staffordshire, ST5 7EF
Tel +44 (0)800 6124662
Fax +44 (0)845 1303726
NBS Plus
NBS National BIM Library