NBS Source
RCM Cemboard


Suitable for following applications:

  • Sheathing board on metal and timber frame.
  • Acoustic roofing and flooring.
  • High impact partitioning.
  • Shuttering.
  • OEM Application where improved strengths and density are required.


Rigid, medium density, high performance wood/ cement particle bonded sheathing board which combines the strength and durability of a concrete product with the workability of timber.

An excellent sheathing and acoustic building board, the product can be used as an outer sheathing board onto metal or timber frame structures, behind the outer cladding finish. They are manufactured from chemically treated rubber wood chips mixed with Portland cement.

Fully tested to BS EN 634-1 and BS EN 434 2 and meets the correct pull-out and performance levels to carry EWI and rainscreen systems. Conforms to BS EN 13986, BS EN 89/106/EC and BS EN 594.

Fire rated to EN 13501-1 class B-s1, d0. Cemboard can be used behind all types of facade solutions, as well as in many acoustic floor and roof constructions.

Features and benefits:

  • Provides excellent acoustic properties.
  • Good water repellence properties.
  • Improved fire performance over timber products.
  • High impact resistance.
  • Formaldehyde free.
  • Fungus and termite attack: Highly resistant.
  • Durability (minimum): 30 years.
  • Smooth front and back face.
  • Nominal density: 1250–1300 kg/m³.
  • Bending strength (Modulus of Rupture): 9.0 MPa.
  • Modulus of Elasticity (MoE): 4.5 MPa.
  • Thermal conductivity: 0.26 W/m·K.
  • Material available with BM Trada FSC Chain of Custody. CE marked.
  • Density ≥1000 1290.35 kg/m³.
  • Bending Strength (Modulus of Rupture) ≥9 13.64 N/mm².
  • Modulus of Elasticity (MoE) ≥4500 6284.61 N/mm².
  • Swelling in thickness (24 hrs) ≥1.5 0.90 %.
  • Internal bonding IB ≥0.5 0.68 N/mm².
  • Swelling in thickness after Cyclic test (EN 317 & EN 321): ≥1.5 1.11 %.
  • Internal bonding after Cyclic test (EN 317 & EN 321): ≥0.3 0.51 N/mm².
  • Release of formaldehyde: Class E1.
  • Moisture content: 6-12 9.02 %.
  • Squareness: 2 0.95 mm/m.
  • Straightness: 1.5 0.99 mm/m.

General information








Non standard (we may have old stock, but we would only purchase if customer committed to MOQ and lead time).

2400 x 1200 x 10 mm

2400 x 1200 x 12 mm

2400 x 1200 x 14 mm

2400 x 1200 x 16 mm

2400 x 1200 x 18 mm

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Uniclass 2015

Pr_25_71_97_12 Cement-bonded particleboardsPrimary


K11/145 Battened cement-bonded particleboard floating floor

K11/245 Cement bonded particleboard floating floor

K11/345 Cement-bonded particleboard flooring

K11/485 Wall sheathing

K11/585 Roof decking

K11/60 Board

K11/795 Wall lining on metal framing

K11/845 Cement-bonded particleboard

K11/890 Board

Specification data - Cement-bonded particleboards Enhanced data


To BS EN 13986:2004.

To BS EN 13986.

ASTM C 518-10.

Performance class

Fire rated to EN 13501-1 class B-s1, d0.


8 mm.

29 dB sound insulation.

10 mm.

31 dB sound insulation.

12 mm.

32 dB sound insulation.

16 mm.

33 dB sound insulation.

18 mm.

33 dB sound insulation.

20 mm.

33 dB sound insulation.

24 mm.

35 dB sound insulation.

Finish as delivered



Light grey.

Product Reference




RCM Foil Tape.

Waterproofing seal.

RCM Intusil.

Neutral cure sealant for use in gaps and joints.

RCM Joint Seal.

Air tightness seal.


To BS EN 13501-1 class B-s1, d0.


Steel Frame 4.8 x 38 mm Wing tip self drilling fixing.

Recommended fixings:

4.8 x 38 mm wing tip self-drilling fixing, 15 mm from edge.

Timber Frame 4.2 x 42 mm Climaseal self drilling fixing.