HT - High Temperature Fireboard

VITCAS HT High Temperature Fireboard – A1 Non-Combustible Board

VITCAS HT High Temperature Fireboard is a heat-resistant, A1 non-combustible fire protection board designed for applications where conventional gypsum plasterboard is unsuitable. Rated to 650°C and classified A1 under EN 13501-1, it provides a durable surface for protective wall and ceiling linings and compatible heat-resistant finishing systems.

The board is water-resistant, mould and mildew resistant, and suitable for finishing with VITCAS Heat Resistant Plaster, tiles or paint. Its smooth and rough faces accommodate different finishing methods.

Key Features

• A1 non-combustible: Reaction-to-fire classification in accordance with EN 13501-1.
• Temperature resistance: Rated up to 650°C.
• Water and mould resistant: Suitable for applications requiring moisture resistance.
• Board dimensions: 1200 × 800 × 12 mm.
• Versatile finishing: Compatible with plaster, tile adhesive and painted finishes.

Typical Applications

• Non-combustible wall and ceiling lining systems.
• Fire protection applications involving brickwork and blockwork.
• Heat-resistant plasterboard installations around suitable heating appliances.
• Boiler areas and high-temperature equipment enclosures.
• Tile backing in compatible high-temperature installations.
• Specified fire door constructions and protective barriers, including thatched-roof applications.

Installation Guidelines

• Board orientation: Install with the smooth face exposed for painting or the rough face exposed for plastering and tiling.
• Cutting: Boards can be cut and drilled using conventional woodworking tools.
• Mechanical fixing: Use suitable countersunk screws at approximately 300 mm centres, positioned 15 mm from board edges. Recommended screws are size 6 or 8, 35–40 mm long.
• Insulation fixings: Use an 8 mm pre-drilled hole where specified.
• Adhesive fixing: Use VITCAS BA Board Adhesive at approximately 3 mm thickness on smooth masonry, or VITCAS HB60 Hydraulic Bonded Adhesive on uneven surfaces.

Important: Where a supporting framework or structural fireplace enclosure is required, use a suitable VITCAS Fireplace Construction Board system. For cassette or inset stoves with exposed metal surrounds, follow the specified VITCAS Render and Plaster system or Fireplace Construction Board installation guidance. Always observe the appliance manufacturer's clearance requirements.

Finishing Options

• Painting: Install with the smooth face exposed. Fill joints using VITCAS Heat Resistant Filler, allow to dry and sand before painting with a compatible emulsion paint.
• Heat-resistant plaster: Install with the rough face exposed. Treat joints with VITCAS Heat Resistant Filler and fibreglass scrim tape. Ensure boards are dry and prime with VITCAS PVA Adhesive Sealer before applying VITCAS Heat Resistant Plaster.
• Tiling: Install with the rough face exposed. Prime with VITCAS PVA Adhesive Sealer before applying VITCAS Heat Resistant Tile Adhesive.

For product quantity estimation, use the VITCAS Quantity Calculator.

Storage and Handling

Store boards flat in a cool, dry environment above 5°C. Protect from weather exposure and avoid stacking on their edges. Carry boards vertically to reduce the risk of damage.

When cutting or drilling, minimise dust generation, wear suitable respiratory and eye protection, and work in a well-ventilated area.

Fire safety note: The A1 classification confirms the board's reaction to fire. It does not establish a fire-resistance rating for an assembled wall, ceiling, door or barrier. Fire resistance depends on the complete specified and tested installation system.