The fire stability
The fire stability of reinforced concrete structures and supports is achieved by limiting the temperature rise of the steel and reinforcement elements embedded in the concrete.
The methods for predicting the fire behaviour of concrete structures by calculation are described in Eurocode NF EN 1992-1-2. They provide that a concrete structural element is fire resistant for 2 hours when its minimum thickness is 12 cm and the steel coating is 4 cm.
In almost all buildings, the standard coating is 2 cm. For this reason, concrete elements need fire protection to compensate for this coating difference.
Ribbed slabs
The undersides of concrete floors are protected in exactly the same way as other structural elements, with the same fire-resistant products.
Hollow-core floors
The undersides of concrete or ceramic slab floors with a notched underside are protected in the same way as other structural elements with the same protective products.
Projiso offers various firewall solutions for concrete structures
Fibrous mineral wool coatings: FIBREXPAN®, FIBROFEU®, FIRESPRAY® and its plaster-based slurry coating: FIREPLASTER®.
The product will be chosen according to the various issues specific to the site.
