Fire protection

All buildings must be designed and constructed to minimise the risk of fire, minimise its spread should it occur, maximise the building structure's stability and the ability of the occupants to escape unharmed.

 

Structural Steel

Structural steel requires fire protection because it loses structural strength at temperatures that can be rapidly reached in a building fire. This will consequently have a negative impact on the structural integrity of the building. Protecting the structural steel from the heat of a fire will delay the onset of this loss of strength and the possible collapse of the building. This is essential because it allows extra time for both the occupants of the building to escape and fire services to tackle the fire.

Any steel section which is an element of structure and is deemed by any of the following regulations to require fire resistance can be protected with a fire protection system of dense Rock Mineral Wool slabs.

At less than half the weight of calcium silicate slabs – Rock Mineral Wool fire protection slabs are easy to handle and fit on site, with either a saw or a sharp knife. There are four fixing methods, all involving square edge butt joints between slabs which enables a fast and simple system to be installed without delaying other trades and activities.

Fire-teK Beam and Column Slab is a dense rock mineral wool slab. It is available unfaced or faced with a bright Class ‘0’ reinforced aluminium foil, for applications above clean rooms, within air plenums, or for aesthetic purposes.

Fire-teK Beam and Column Slab can be used to provide up to 4 hours fire protection to structural steel and cast iron columns, beams and trusses.

 

Cavity barriers

Every building must be designed and constructed in such a way that in the event of an outbreak of fire within the building, the unseen spread of fire and smoke within concealed cavities in its structure and fabric is inhibited. The Building Regulations require cavity barriers to sub-divide voids if they extend beyond certain dimensions.

Cavity barriers are also required to be placed above fire resisting partitions. Both Glass Mineral Wool and Rock Mineral Wool products are ideal to act as cavity barriers due to their inherent non-combustibility.

Fire and smoke spread in concealed spaces is particularly hazardous because fire can spread quickly throughout a building and remain undetected by the occupants of the building.

Cavity barriers should achieve at least 30 minutes fire resistance, providing a minimum of 30 minutes integrity and 15 minutes insulation.

Fire-teK WM 910 is made from Rock Mineral Wool and formed into a flexible mattress faced on one side with galvanised wire mesh stitched in position, and is also available foil faced on one or both sides.

For half an hour fire resistance a single layer of 50mm Fire-teK WM 910 is applied as a hanging curtain, supported continuously from above and both sides, using the fixings listed in the below PDF.

For one hour fire resistance, two layers of 50mm Fire-teK WM 910 is separated by a 50mm air space, and applied as a hanging curtain with wire mesh to the outside, supported continuously from above and both sides, using the fixings listed in the below PDF.

 

Duct encasement

In accordance with The Building Regulations, when ductwork passes through any element of construction which has a designated period of fire resistance, the integrity of that compartment should be maintained.

Any vertical or horizontal, rectangular or square steel ductwork associated with ventilation and/or air conditioning systems, including ducted supply and extract systems (whether through ducts or plenums), mechanically assisted systems and those relying on natural convection can be protected with Fire-teK BD 917 to provide the required degree of fire protection.

The required thickness of Fire-teK BD 917 depends upon the orientation of the duct and the period of fire resistance required.

Fire-teK BD 917 is a 160 kg/m3 density Rock Mineral Wool slab. The slabs are faced with a bright Class ‘O’ reinforced aluminium foil, making it suitable for applications above clean rooms, within air plenums or for aesthetic purposes.

Fire-teK BD 917 is applied in a single thickness, removing the need for multi layer applications. This provides assurance of a uniform thickness and therefore the integrity of the system and allows for easy verification of correct installation on site.

Fire-teK BD 917 has been tested in accordance with BS 476: 24:1987 and can provide up to two hours fire resistance for steel ductwork exposed to fire either inside or outside of the duct.

 

Download the Fire protection application PDF