Fires in buildings regularly exceed 1000°C within around 30-60 minutes.

Regardless of the grade, heavily loaded steel loses around half of its strength at around 550°C. As temperatures continue to rise further, the loss of strength is rapid and significant.

It is therefore essential that steelwork is insulated to extend the period of time that it can continue to provide its loadbearing function. This can be achieved using three main methods;

Reactive - Intumescent Paints
Non-Reactive - Board Encasement and Cementitious Sprays

Promat P250 board encasementPromat P250 board encasement to structural steels at Liverpool Street Crossrail Station

Video courtesy of the ASFP