High-performance cement bonded particle building board

RCM Cemboard is a rigid, medium density, high-performance cement bonded particle building board which offers great strength and stability with the workability of wood.

Cemboard is used primarily as an external sheathing board. It provides excellent acoustic properties making it an excellent acoustic building board. Used extensively on both metal and timber frame structures, it is also a great choice for modular and offsite builds.

Cemboard can be used behind all types of façade solutions, as well as in acoustic and flooring applications.

  • EN 13501-1 class B-s1, d0

  • 2400 x 1200mm ( 8mm, 10mm, 12mm, 16mm, 18mm, 20mm and 24mm)

Request a Sample


  • Fire rated to EN 13501-1 class B-s1, d0
  • High impact resistance
  • Good water resistance
  • Great strength and stability
  • Improved strength and density for OEM applications
  • Excellent acoustic properties
  • Integrates with other Benx products

Key applications

  • Sheathing board
  • Acoustic applications
  • High impact partitioning
  • Shuttering
  • OEM applications


RCM Cemboard can be cut, drilled and nailed using conventional hand tools; offering many of the properties of timber.

For cutting the product in any volume, we recommend the use of an RCM poly crystalline diamond Dart Blade to avoid excessive wear on other blades. Alternatively, RCM offer a complete fabrication service, please contact our technical department for details or visit our fabrication and design page here.

Suitable for the Following Construction Types

  • Lightweight Steel Frame

  • Timber Frame

  • Modular / Offsite

A building board with multiple uses

  • Cemboard

    Cemboard on steel frame

Technical Information

  • Nominal Density

    1330 kg/m3

  • Bending Strength

    ((Modulus of Rupture))

    9 N/mm2

  • Modulus of Elasticity


    4500 N/mm2

  • Internal Bonding

    EN 310 and EN 13986:2004 - 0.5 N/mm2

  • Thermal Conductivity

    0.20 W/mk

  • Moisture Content

    9% ±3%

  • Reaction to Fire

    BS EN 13501-1 rated to B-s1,d0

  • Biological Resistance

    Highly Resistant

  • Surface Condition

    • Front Face


    • Back Face


  • Durability

    ((Life Expectancy - Minimum))

    30 years

  • Standard Board Sizes

    2400 x 1200mm

  • Thickness

    ((mm) )

    10 12 16 18 20 24

  • Nominal Mass of Product

    ((kg/m²) )

    13.3 16 21.3 24 26.6 32

  • Dimensional Tolerance

    • Length


    • Width


    • Thickness

      <12mm: ±0.7mm

      12-15mm: ±1.0mm

      15-18mm: ±1.2mm

      >19mm: ±1.5mm

  • Product Testing and Certification

    • Fire Reaction Tests

      BS EN 13501-1:2007+A1: 2009 - rated to B-s1,d0

      BS EN 13823:2010

    • Physical Properties

      BS EN634 Part 1 & 2

      BS EN 594

      BS EN 13986

      BS EN 1062-1

  • Recommended Fixings

    • Recommended Fixings

      BS EN 1062-1:2004

      Paints and varnishes. Coating materials and coating systems for exterior masonry and concrete - Classification

    • Steel Frame

      FIX006 - 4.8mm x 38mm Wing tip self drilling fixing

    • Timber Frame

      FIX005 - 4.2mm x 42mm Climaseal self drilling fixing


  • RCM Cemboard can be used as an external sheathing board on structures under 11m in height or where a fire specification has not been specified.
  • RCM Cemboard can be used in internal linings and flooring application. Please be mindful to check the moisture movement of our Cemboard if the product will be subject to continued high levels of moisture. To be suitable for this application there cannot be high levels of moisture.
  • RCM Cemboard can be used as part of an acoustic build up.

Both faces of RCM Cemboard have a smooth surface, the board is stencilled on the reverse side.

RCM Cemboard has a rating of B-s1, d0 to EN13501-1 this is a reaction to fire classification and should not be confused with fire resistance.

No, RCM Cemboard cannot be left permanently exposed.

RCM Dafa tape or RCM 315 tape should be applied to all board to board joints as soon as possible after fixing the boards, unless an air tight seal is required to the external face of the sheathing board, for an air tight seal then the RCM Joint seal system should be used.

If the joints are taped as soon as the boards are fitted they can be left exposed during the construction phase for up to 3 months, for up to 12 months temporary exposure we highly recommend using the RCM Joint Seal Kit.

No, Cemboard is not suitable to be used as a tile backer board. Multipurpose is an excellent choice instead for a tile backer board.

No, RCM Cemboard is not suitable for use with a plaster skim coat.

No, RCM Cemboard is not suitable for use as a render carrier board. Renderflex however is.

RCM Cemboard edge distance is 12-15mm except at the board corners where fixings should be moved up or down to achieve 50mm. Fixings should be fixed using a maximum 600mm x 300mm grid pattern.

  • 27 No. fixings per 2400mm x 1200mm sheet when fixed in a vertical orientation.
  • 25 No. fixings per 2400mm x 1200mm sheet when fixed in a horizontal orientation.

For fixing into SFS framing 4.8mm x 38mm self-drilling wingtip fixings suitably treated against corrosion should be used.

For fixing into Timber framing 4.2mm x 42mm self-drilling fixings suitably treated against corrosion should be used.

RCM can supply Poly Crystalline Diamond (PCD) blades suitable for cutting RCM Cemboard in a range of diameter and bore sizes, please contact RCM Technical department for further information.

Technical Specifications

Brochure Image

Brochure Download

Download the Cemboard Product Fact Sheet

Download Brochure

Moneypenny Headquarters


The UK’s leading telephone answering specialist Moneypenny had steadily been growing since its inception in 2000. Its main business is looking after telephone calls for businesses. To no one’s surprise,...

Cemboard Case Studies

  • Hotel La Tour


  • Rathbone Market Case Study



Used to allow insulated structures to easily release excess moisture vapour into the atmosphere and keep the internal elements of wall structures dry.
EPDM is an important Benx façade protection layer. It is a synthetic rubber material which is both weather resistant and tear-resistant.
Essential accessories for a wide variety of applications, including sealing of sheathing boards and the durable bonding of breather membranes.
Contact Us

Contact Us