Fire Resistance Performance

As the fire resistance performance of structural members is an important concern in all types of construction, it is considered in DIN 4102, part 1 and 2.

In case of fire, wooden structural members develop a charcoal layer that reduces thermal conduction, combustibility and flame spread, and thus protects the inner part of the cross section.

As, on average, wood burns down at a rate of 0.7 mm per minute, the cross section of the material is reduced by approximately 20 mm in 30 minutes and by 40 mm in 60 minutes. This is why the load bearing potential of the remaining cross section is of major importance. The respective fire resistance grades F 30 and F 60 refer to the fire endurance of these wooden members. Due to the material properties of wood, the fire-resistance performance of wooden structural members is excellent.

The following fire-resistance grades are used in order to provide detailed information on the fire performance characteristics of certain structural members:

  • F 30-B refers to the fire resistance of supporting structures such as walls
  • F 90-A refers to the fire resistance of supporting structures such as ferroconcrete roof constructions. The number 90 indicates that the structural elements have a fire-resistance period of 90 minutes.
  • T 30 refers to doors. The number 30 indicates that the respective door has a fire-resistance period of 30 minutes.