Why non-combustible stone wool insulation makes sense
20 December, 2017
Given that most fires occur in domestic dwellings, blocks of flats have a high safety risk potential in the event of a fire. Today’s modern multi-storey buildings tend to offer a complex mix of occupation, including offices, hotels, residential, retail and leisure facilities. In this type of building, fire can quickly spread through the material of an external cladding system or through the cavities. Careful consideration of the design and potential fire risk in such buildings is required with particular emphasis on containment to allow safe evacuation, reduce the risk of fire spread to other buildings and to enable access for fire fighters.
Fire safety standards, embodied in Building Regulations Part B Fire Safety and associated Approved Documents, are designed to ensure that adequate fire safety provisions are incorporated in High Rise Buildings of whatever type. Regulation B4 requires the external walls of a building to adequately “resist the spread of fire” with functional requirements given in Approved Documents. In any building, the cladding system and materials must conform or exceed the regulation for limited combustibility defined in BR 135: “Fire Performance of External Insulation for Walls of Multi-Storey Buildings”, when tested in accordance with BS 8414-1:2002 and BS 8414-2:2005 for its range of external wall insulation systems. This testing satisfies building regulations in England & Wales and Scotland pertaining to fire for buildings over 18 metres tall. The BR 135 classification is called for as an alternative guidance to non-combustibility compliance for domestic and commercial applications.
In our view, a much more straightforward route to demonstrating compliance with BR 135 and optimising fire safety performance is to use stone wool insulation that is non-combustible. Non-combustible products will not contribute in any stage of the fire, including a fully developed fire according to the European reaction-to-fire classification standard BS EN 13501-1.
ROCKWOOL stone wool insulation tolerates temperatures of up to 1000°C and has been awarded this highest possible European classification: A1 non-combustible, it provides vital fire protection in buildings, keeping people safe, as well as minimising damage to valuable assets. In the event of a fire, it is designed to remain stable, slow the spread of flames and help protect the building’s load-bearing structure, buying valuable time for occupants to safely escape to protect lives and investment.