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We Tested the Fire Resistance of a Wall Panel for Wooden Structures

10.02.2020

In the scope of the contractual research for the National Wood Processing Cluster, we developed a new facade panel for wooden structures of family houses and blocks of flats. We had its fire resistance tested in the PAVUS, a.s. test room in Veselí nad Lužnicí. Consequently, we checked the reaction of the facade to fire in the laboratory of the University Centre for Energy-Efficient Buildings of the CTU in Buštěhrad as well.

The new wood-fiber panel for facades of wooden structures of family houses and blocks of flats has been designed with the aim of application in buildings with zero energy consumption and of fulfilling the requirements of standards that will be in effect after 2020. The composition of the external wall for prefabricated wooden structures contains exclusively materials based of lignin and cellulose, i.e. blown recycled cellulose and wood-fiber insulating boards. The facade panel uses materials based on wood to maximum extent, it allows using the potential of blown thermal insulations and it limits thermal bridges at the contact points of the perimeter wall and the ceiling or roof.

The test of fire resistance of the external wall with the dimensions of 3.0 x 3.0 m took place in the test laboratory of PAVUS, a.s. in December 2019. The specimen exceeded all expectations because it was resisting the standarded iso-curve fire and temperatures around 1000 °C for more than one hour and it acquired the final classification of REI 60 DP3. The advantage is that this fire resistance was determined for the specimen without an installation wall where it is therefore possible to lead any media without the need of sealing them against fire.

Consequently, the test of reaction of smaller facade specimens to fire took place in the CTU UCEEB Fire Laboratory. Under the panel 1.2 m wide and 2.0 m high, a burner was placed which was producing fire with the performance of 150 kW for 30 minutes. During this time, no damage of the facade plaster occurred and the specimen did not contribute to the intensity of the fire significantly because ignition temperatures of wooden materials were only observed in the first insulation layer. Blunt joint of two facade panels was tested as well but this joint was not a weak point from the viewpoint of reaction of the faced to fire either.