Fire Retardant Treated
External Cladding

In many situations, timber and wood-based materials may be used in their natural, untreated state. However, flame-retardant (FR) treatments extend their use to situations that demand enhanced ‘reaction to fire’ properties.

We supply several fire treated exterior timber cladding options such as SertiWOOD, Siberian Larch and Thermowood.External cladding can be fire retardant up to Euro Class B according to EN13501-1 or to BS476 Part 6 and 7 to class O or Class 1. This is carried out using various methods under factory-controlled environments.

Timber cladding can be treated to upgrade fire performance to Euroclass B or C or National class 1 or 2 (or Class ‘0’, found only in Approved Document B to the Building Regulations, where it is defined by a combination of performance in tests according to BS 476 Parts 6 and 7).