The use of wooden stud walls as a room-enclosing component for a fire-retardant requirement is possible if a corresponding building authority proof of usability for fire resistance class F30-B according to DIN 4102 (or EI 30 according to DIN EN 13501) is available for the product.
It should be noted, however, that the specification F60 or F60-B in accordance with DIN 4102 or F90 or F90-B in accordance with DIN 4102 is not to be equated with the fulfilment of a building authority requirement as a highly fire-retardant or fire-resistant room-enclosing component, since in the case of a classification according to DIN 4102, the components for this must consist of the essential parts of non-combustible building materials, i.e. a classification F60-AB (for highly fire retardant) or F90-AB (for fire resistant).
However, according to the Model Building Code (and according to the German state building codes derived from it), components whose load-bearing and stiffening parts consist of combustible building materials (e.g. wood), which have effective fire protection cladding made of non-combustible building materials (fire protection clothing) and insulation materials made of non-combustible building materials, can meet the requirements for highly fire-retardant components.
However, a classification of timber stud walls as highly fire-retardant room-enclosing components is not possible according to DIN 4102, but only according to DIN EN 13501, as only the European classification of the fire resistance of components does not take into account the fire behaviour of the building materials. In this case, the fire protection capacity of the fire protection effective cladding made of non-combustible building materials (fire protection clothing) must be proven in addition to fire resistance and classified according to DIN EN 13501-2 with K2 60 (see Annex 0.1.2 to the Building Rules List A Part 1 in conjunction with the respective state building code).
Timber stud walls can therefore basically meet the requirement of high fire retardancy as a room-enclosing component, but only if they are classified EI 60 according to DIN EN 13501. The classification F60-AB according to DIN 4102, which is equivalent to building regulations, is not possible for these walls.
Walls that are fire-resistant as room-enclosing components and fire walls are generally not possible with timber stud walls, unless there is an exception in the respective state building code, such as for room-enclosing building end walls:
Instead of fire walls, the model building code (and most German state building codes) also permits building end walls for buildings of building classes 1 to 3, "which have the fire resistance of the load-bearing and stiffening parts of the building from the inside out, but at least fire-retardant components, and from the outside to the inside the fire resistance of fire-resistant components." According to DIN 4102-4, these walls are classified as "building end walls (F30-B) + (F90-B)". The individual requirements for a corresponding classification, e.g. for the wooden ribs, the insulation layer and the planking/cladding, can be found in DIN 4102-4, Section 4.12.8.
Source: bauwion
