Fire resistance is an ability of a partition / building element to meet applicable requirements in conditions simulating a fire situation. During a fire, the most vital element is the possibility of evacuation so the measure of fire resistance is the time from the beginning of the (expressed in minutes), during which the following criteria are still met:
A fire resistance class describes fire resistance required for a given partition / building element.
Fire resistance classes usually combine the ordinary criterion E and I, or R, E and I, e.g. EI 15, EI 30, EI 45, EI 60, EI 90, REI 120, REI 180.
See the “Fire resistance“ definition for a more precise explanation of the E, I and R criteria.
Five building fire resistance classes are established. They are marked in the descending order with the following letters “A”, “B”, “C”, “D” and “E”.
Elements of a building included in a given fire resistance class must meet the conditions defined in the Regulation on the technical conditions that should be met buildings and their locations.
These are documents issued on the basis of tests by authorised research units which define the fire resistance classes(e.g. EI 30, EI 60) for tested building elements, e.g. as regards drywall systems - partition walls, curtain walls, suspended ceilings, attic linings and dry screeds.
Fire classifications also contain detailed descriptions of solutions, information on materials used, drawings, solution details, joint details, etc.