There are basically two methods for the selection of the required fire protection level. Elements of each method can be used to augment the other.
Method 1: Fire protection level in accordance with Eurocode 5.1.2 Appendix B
This reflects the rate of combustion of wood of 0.7 respectively 0.8 mm per minute and the various retardation times established by a plethora of combustion tests, where retardation was achieved by additional treatment of the underside and of the side. Irrespective of need for a size sufficient to cover the incidence of fire, many experts and test engineers demand the commissioning of an object-specific test certificate, i.e. an expert opinion.
Together with a major, renowned industrial partner we carried out a large number of fire test on a 1:1 scale. This provided us with important new information about the way to design protection against attack by fire from below or the side so as to be able to meet the stipulated fire protection classifications F30, F60 and F90 by application of appropriate new designs. As a rule, an expensive fire protection coating to protect against an attack from below (Promat, etc.) can be compensated for by means of an intelligent cladding. The attack by fire from above is on an Elascon timber+concrete composite structure is not critical in most cases, nor is the temperature rise for an adjacent room. We have been able to allocate more than 35 historical ceiling structures to different classes of fire.
We shall be happy to provide a test certificate with specific and detailed information on the design and the implementation for your building.