Trisobuild® Fire Wall Systems for single storey industrial buildings
We are frequently asked for a specification for a “60 minute fire wall” . Sometimes, no further information is provided, or indeed can be provided. This note has been written to explain in a little more detail why we have different specifications within our current brochure and hopefully provide some guidance on the use of fire wall systems for single storey industrial buildings.
The requirement for fire walls is set out in detail in Building Regulation ADB, but for the elements we are generally involved with, the following brief summary will generally suffice.
Fire walls can be split into three basic categories:-
- External walls less than 1000 mm from the relevant boundary
- External walls more than 1000 mm from the boundary
- Compartment walls.
For walls less than 1000 mm from the boundary the construction must have an integrity rating of 60 minutes and an insulation rating of 60 minutes. If the building is fitted with sprinklers both these figures can be reduced to 30 minutes. The fire should be considered to act from either side.
For walls more than 1000 mm from the boundary the construction must have an integrity rating of 60 minutes and an insulation rating of 15 minutes. The integrity can be reduced to 30 minutes if sprinklers are fitted. The fire is considered to act from the inside only.
Compartment walls are similar to walls less than 1000 mm from the boundary with the exception that where the wall is separating buildings then the sprinkler reduction is not allowed. It should be noted however that on many occasions greater periods of fire resistance can be requested by the insurance companies
The test method for evaluating the fire resistance of non load bearing constructions is BS 476–22: 1987, whilst
BS 476-20:1987 gives the criteria for measuring the integrity and insulation.
A failure of integrity occurs if the wall collapses or sustained flaming is seen on the unexposed face. An insulation failure occurs if the mean temperature across the unexposed face rises more than 140ºC or in any individual location the temperature rises above 180ºC.
At Tata Steel we can supply the full range of options above and can provide an unbiased view on selecting the correct system for your project needs. For further information on different metal cladding systems you can find literature downloads at our website (literature downloads) or by calling out technical department on 01244 892199