20mm Marmox Fireboard - A1-Rated Fireproof Insulation Board - 1200mm x 600mm

20mm Marmox Fireboard is a lightweight, A1-rated non-combustible insulation board that combines fire protection, thermal insulation, and acoustic performance in one render-ready panel. It’s suitable for internal and external walls and ceilings, especially in high-risk or multi-storey buildings.

CHARACTERISTICS

• Non-combustible insulation and render board
• Core Material: Marmox mineral stone wool
• Surface Finish: Polymer-modified cement coating with embedded fibreglass mesh
• A1 fire-rated for maximum protection in high-risk zones
• Weatherproof and moisture-resistant – suitable for wet environments
• Excellent acoustic insulation – reduces airborne sound transmission
• High thermal performance – helps prevent heat loss and condensation
• Render-ready surface – no pre-treatment required before plastering or rendering
• Lightweight and easy to cut – install with standard hand tools
• Compatible with Marmox washers and MSP360 adhesive

APPLICATION

• Fireproof lining for internal walls and ceilings
• External wall insulation (EWI) systems, including elevations over 18m
• Safe substrate for render finishes in multi-storey buildings
• Fire protection for SIPs panels, timber, masonry, and steel frames
• Acoustic insulation in residential and commercial settings

INSTALLATION

• Boards can be fixed directly to timber battens, masonry, or steel frames.
• Use Marmox mesh tape over joints and fix with washers at 300mm centres (600mm for thicker boards).
• Finish with plaster or render as required.