Calcium Silicate Board – Sheet – Interior & Exterior Applications

Product Overview

The 12mm Calcium Silicate Board, measuring 2400mm x 1200mm, is a high-performance, non-combustible sheathing board designed for use behind façade systems, rainscreens, and cladding. Manufactured from calcium silicate reinforced with selected fibers, it provides a dimensionally stable substrate with excellent fire resistance and structural rigidity.

This board is suitable for both steel and timber frame applications, forming a robust external sheathing layer that maintains integrity under high temperature and moisture variations. Its smooth, dense surface resists delamination, impact, and weather exposure during construction, ensuring long-term performance.

Engineered for use in ventilated façade systems, the board has been independently tested to meet fire and durability standards. The 12mm thickness provides enhanced stiffness and strength, making it suitable for medium to high-rise projects where wind loading and mechanical fixing demands are greater.

Features & Benefits

• High-density calcium silicate composition: Provides excellent dimensional stability and durability.
• Non-combustible performance: Classified to A1 under BS EN 13501-1.
• Moisture and weather resistant: Maintains strength and flatness under varying conditions.
• Versatile sheathing use: Suitable for both steel and timber frame construction behind cladding.
• Smooth surface finish: Accepts coatings, membranes, or insulation systems without surface preparation.
• Impact and edge strength: Resists damage during handling, fixing, and service life.
• Low movement characteristics: Reduces risk of cracking under thermal or humidity variation.
• Board size 2400mm x 1200mm x 12mm: Provides optimal coverage with fewer joints.

Applications

• External sheathing: Forms a stable backing layer behind rainscreen cladding.
• Timber and steel frame walls: Provides a fire-resistant substrate for structural framing systems.
• High-rise and commercial buildings: Used in non-combustible external wall linings.
• Modular and offsite construction: Ideal for factory-assembled wall panels.
• Internal fire protection: Suitable for partitions requiring Class A1 fire-rated performance.

• Material: Calcium silicate reinforced with fibers
• Fire Rating: A1 under BS EN 13501-1

FAQ

• What applications are suitable for this board? It is suitable for external sheathing, timber and steel frame walls, high-rise buildings, modular construction, and internal fire protection.
• Is the board fire-resistant? Yes, it is classified as A1 non-combustible under BS EN 13501-1.
• Can it withstand moisture? Yes, it maintains strength and flatness when exposed to moisture or changing site conditions.