Knauf Fireboard

Fire protection for structural steel columns and beams

Knauf Fireboard



Knauf Fireboard is non-combustible to BS 476: Part 4: 1970 (1984) and Class 1
Surface Spread of Flame to BS 476: Part 7: 1997. Knauf Fireboard complies with the Class ‘O’ requirements of the Building Regulations when tested to BS 476: Part 6: 1989 and Part 7: 1997.


Knauf Fireboard is a gypsum based board specially developed for high performance lining and encasement, providing up to two hours of fire protection. Knauf Fireboard has a high quality white smooth surface finish ideally suited as a self finish or to receive direct decoration with most paint finishes or can be plastered directly.


  • Lightweight and easy to handle and cut
  • Versatile fixing systems
  • Quick and simple to install


Knauf Fireboard is suitable for encasement of structural steelwork, providing differing rates of fire protection up to two hours and different forms of construction. Knauf Fireboard is used in frameless encasement where the material has been specially
developed to accept direct edge fixings. Casings consist of Knauf Fireboard screwed or stapled to itself at abutting corners. For steelwork encased on all four sides, Knauf Fireboard is fixed at each corner directly through the material, independent of the
column or beam. For partial encasement, involving wall or ceiling abutments, Knauf Fireboard is fixed to light gauge steel angles.

Health and Safety

Knauf Fireboard must be installed with care. Ensure adequate ventilation during installation, particularly when cutting boards. Avoid harsh body contact with sharp cut edges of metal components. 

Holes for switch or socket boxes should be cut out before the boards are fixed using a utility saw or sharp knife. When cutting boards, power and hand tools should be used with care and in accordance with the manufacturers’ recommendations. Power tools should only be used by people who have been instructed and trained to use them safely. Consider monitoring of exposure levels during this activity. Appropriate personal protective equipment should be used.



Constant humidity over 95% or subjection to continuous water will reduce the serviceability of the boards.

Operating temperatures

Temperatures over 50ºC can induce a material change of state which would reduce physical performance and serviceability. Knauf Fireboard has a working temperature ranging between 0 to 40ºC.


Knauf Fireboard can be cut with a plasterboard saw or by scoring the board with a sharp knife and snapping the board over a straight edge.


Product Data

Knauf Fireboard

Thickness (mm)Length (mm)Width (mm)

Surface pH




Water Absorption

(24 houts -%)

Water Vapour Transmission


Boards per PallettArea per Pallet (m2)
30 1800 1200 6-8 800 <20 8 26 56.16
25 1800 1200 6-8 800 <20 8 32 69.12
20 1800 1200 6-8 800 <20 8 40 86.40
15 2400 1200 6-8 800 <20 8 40 115.20

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