Worth knowing ...
PIR rigid foam's reaction to fire in lightweight steel roofs
When designing roofs from the point of view of fire protection, the roof structure should be regarded as a system. The fire properties of the individual functional layers only give a very limited indication of how the roof as a whole will react to fire. In fire tests, PIR insulation materials demonstrate an extremely good reaction to fire. In many countries nowadays, including the USA, PIR is far and away the most widely-used insulation material for large roofs. In Germany, too, these high-performance insulation materials are becoming more and more popular thanks to their high thermal resistance, excellent thermal insulation properties, resistance to melting and ease of installation. In the event of a fire, PIR rigid foam retains its insulation effect for longer and does not drip down, thus protecting other structural layers from the effect of the fire.