Building materials classified as not easily flammable ('schwerentflammbar') ensure that when exposed to an initial or growing fire, the relevant parts of the structural works only make a limited contribution to the fire and only allow limited spread of fire both during and upon cessation of the fire exposure.

Regulatory framework

Classification of the reaction-to-fire of construction products is relevant to ensure fulfilment of the regulatory safety levels, cf. Model Building Code (MBO), Sections 3 and 14 in conjunction with Section 26.

DIBt grants national technical approvals (abZ) for the reaction-to-fire of building materials

• for which neither Technical Building Rules nor generally recognised technical rules exist or
• which significantly deviate from the applicable Technical Building Rules and which
• are not subject to a national technical test certificate (abP) in accordance with the Technical Building Rules, cf. MVV TB, Section C 3, no. C 3.2 or C 3.4.

DIBt grants national technical approvals (abZ) for the reaction-to-fire of construction techniques

• which significantly deviate from the applicable Technical Building Rules or for which there are no generally recognised technical rules.

Please also refer to the Technical Building Rules, cf. in particular:

• MVV TB, Part A 2.2, no. A 2.2.1.2 'Regulatory requirements, assignment of classes, use of construction products, application of construction techniques'
• MVV TB, Section A 2.2, no. A 2.2.1.3 Classified building materials and components, execution rules (referring to DIN 4102-4:2016-05)
• MVV TB, Section A 2.2, no. A 2.2.1.6 'Ventilated external wall claddings'
• MVV TB, Annex 4 'Regulatory requirements, assignment of classes, use of construction products, application of construction techniques'
• MVV TB, Annex 5 'ETICS with EPS, method for facade base fire tests'
• MVV TB, Annex 6 'Ventilated external wall claddings'
• MVV TB, Annex 11 'ETICS covered by an ETA in accordance with ETAG 004'

Reference is made to the CWFT (classification without further testing) decisions of the European Commission.