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RF cladding of metal beams

Fire protection of steel, concrete and wood structures according to EN 13381-1 to 9 using PROMATECT®-H, PROMATECT®-L, PROMATECT®-100

The fire resistance of a building element is the time during which this element fulfills its load-bearing function in case of fire. Firstly, reference is made here to exposure to the traditional cellulosic fire according to ISO 834, which is the basis of all European fire resistance test methods and which is considered a reference for traditional fires in houses, offices, hotels, etc.

Protection techniques have always been available on the market. The correct method is to apply a protective product on the supporting structure. Depending on the situation you can choose between a box consisting of fireproof panels, a projection with a fireproof mortar or a layer of fireproof paint.

This class of standards describes fire tests on a number of conventional test items, from which the required protection thickness for a specific fire resistance for a group of elements is determined, for a specifc group of construction elements (concrete slabs, metal constructions and others).

The results of these tests are included in an evaluation report, which is drawn up by an institution, generally European, in table format. The Belgian institutions are the laboratory of the University of Liege or Warringtonfiregent. The I.S.I.B. (Fire Safety Institute – located in Liège and Ghent) can also write national technical opinions, which are valid in Belgium only. The full list of notified institutions can be found on the website of the European Commission.


The steel girders are protected by a box made of PROMATECT®-H cement autoclaved calcium silicate plates with a density of ± 870 kg / m³. The protection thickness for fire resistance 30 / R 60 / R 90 / R 120 is determined by profile as a function of the critical steel temperature (° C) and the mass factor (m-1). Shims of the same material with a width of 120 mm and a minimum thickness of 20 mm are wedged between the wings with a maximum distance between shims of 1250 mm.

The strips are arranged around the steel beam and fixed to each other every 100 mm and min. 50 mm from the edge by means of staples of a minimum length which equals 2 times the thickness of the plate.


The fire resistance R 30 / R 60 / R 90 / R 120 according to EN 13381-4 is demonstrated by an evaluation report which will serve as basis for the execution.

Measuring unit

Measuring unit : m²