RCM Cemboard external sheathing board

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.