ABOUT FIREPROOF WOOD

Fire technology description

What is fire impregnation?
With respect to fire protection, the concept of fire protection impregnation is neither surface treatment with a flow machine nor spraying/dipping. The impregnation of wood (i.e. fire impregnation) is an industrial vacuum process in which flows, times, and pressures are recorded by process computers. It is not about comparing impregnation (in which the fire protection agent penetrates deep into the cell structure of the wood though pressure) with superficial spraying (which some stakeholders claim offers adequate and long-term performance despite the fact that it essentially only adheres to the outer fibre of the wood).

How does the type of wood affect the fire class?
According to the Euroclass system and CWFT, plain wood has a performance of D-s2, d0. Impregnation can improve the performance of wood and yield a performance of B-s1, d0. However, there are several factors that affect this. The natural characteristics of wood (e.g. density, capillary properties, and resin content) affect the result. The generation of smoke and heat directly determine performance. B-s1, d0 or B-s2, d0 and so on. Each type of wood must therefore be fire tested, rated, and certified. This means that the entire production chain and quality control are incorporated into the system.

Fields of application?
This is often neglected because many are not familiar with the term or simply do not understand the meaning. The result depends on how the product is tested. If a product (e.g. spruce panel) has a performance of B-s1, d0 without an air gap, it must not be fitted with an air gap because it is not verified in accordance with this precondition. There are examples in which a product has a performance of B-s1, d0 without an air gap but B-s2, d0 with an air gap. The product is thus not approved for indoor use in cases where B-s1, d0 is a requirement.

Is there a difference between fire painting and fire impregnation?
oating the wood with fire paint protects it against fire. The difference is that the paint layer does not change the properties of the wood. This means that the wood must be painted on all exposed sides (e.g. four sides when spaced boarding is mounted or front and back and in each hole when perforated plywood is used). Norway and Denmark require the same fire class of the air gap (e.g. exterior siding). This means that all sides of the wooden panel must be treated with fire paint when multi-storey buildings are built with a wood façade. In the case of Woodsafe fire impregnation, all four sides always feature fire protection by default. There are also wood products that constitute the actual performance against fire (e.g. B-s1, d0 and K210/B-s1, d0).

Why must I choose certified products?
Imagine that you passed the theory test for driving license but have not demonstrated that you can drive a car. You will not receive a driver's licence and will therefore not be able to drive a car. The same applies to the fire protection of wood. The product must not only be fire tested and classified but also certified. Unfortunately, the improper wording of the certificate can lead to confusion. Read more on the support page.