Technical Overview - version 2023
RCM Y-Wall – Technical Overview Summary
Product: Calcium silicate sheathing board, BBA certified (14/5109).
Applications: Structural and non-structural sheathing behind façade/rainscreen cladding on steel or timber frames; internal lining in domestic/non-domestic buildings.
Fire Performance: Class A1 (BS EN 13501-1:2018).
Accredited Thicknesses: 9, 12, 15 mm.
Exposure: Suitable for all exposure zones; up to 1-year exposure if unprotected.
Thermal Conductivity: 0.23 W/mK.
Moisture Resistance: Class A – suitable for heat, high moisture, and severe frost (BS EN 12467:2018).
Durability: Passes hygrothermal and freeze-thaw testing to BS EN 12467.
Fixing: Mechanical fixing, withstands all wind loadings; no height limitations
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