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When the European system was introduced, the concept of flame retardant cladding was put on the edge, because national testing methods would be replaced by European.

The major change is, in principle, that the NT-Fire 004 box method was replaced by EN13823 while the oven test is the same EN14135 (NT-Fire 003).

When the transition was SP (now RISE) commissioned by the Housing Board to untangle and since then, the industry has been divided into two sides.

One side feels that the combination K210/B-s1, d0 must be met by the wooden panel in itself that is both K210 and B-s1, d0.

The other side means that the function is to meet the requirement K210/B-s1, d0.

RISE has published that wood of a specific density and thickness meets K210 without the need for fire protection.

Woodsafe wants to point out that something is lost in this context.

The BBR does not prescribe K210 or K110. What is prescribed is the combination K210/B-s1, d0 which means that the product should have a property of K210/B-s1, d0.

IT IS IMPORTANT TO KNOW that there is debate about whether applied paint coatings on wood substrates are K210/B-s1, d0 or not.

In some instances, manufacturers and practitioners argue that fire protection paint applied to wood paneling is K210/B-s1, d0, while the Swedish National Board of Housing, Building and Planning's statement and seminar contend that the functional requirements according to the purpose of the coating K210/B-s1, d0 are not met.

RISE (formerly SP) has carried out extensive testing of solid wood and wood-based discs according to EN14135, and has determined that untreated wood product with sufficient density and thickness meets the requirements for K210.

On the other hand, the report does not comment on the fact that nowhere in the Swedish National Board of Housing, Building and Planning's BBR is K210 or K110 prescribed for individual performance requirements.

What is provided in the Swedish National Board of Housing, Building and Planning's BBR is K210/B-s1,d0, i.e. a product that in itself satisfies both requirements. Woodsafe impregnated wood has its own property after wood processing, achieving B-s1, d0 and K210 and thus fulfilling the requirement K210/B-s1,d0.

If you look at fire protection painting on untreated wood, the properties of wood will not be processed. The only thing that happens is that the substrate, i.e. the wood with D-s2, has a protective layer of paint, not that the wood as such has its own property B-s1, d0 or K210/B-s1, d0.

No matter what the industry and its operators argue, the purpose of fire impregnation or fire protection paint is to protect the wood or bearers to which fire protection paint is applied.

Accepting wood with performance D-s2, d0 as K210 for use as K210/B-s1, d0 means in practice that the industry accepts that a "regular wood plank acts as a victim plank" to protect another plank.

In principle, there is a victim plank D-s2, d0 to protect another plank D-s2, d0.

What is then the purpose of the functional requirement?

In combination with the property, flame retardant painted wood product K210/D-s2,d0 + B-s1,d0 while a Woodsafe impregnated wood product is K210/B-s1, d0.

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Woodsafe Magazine

Woodsafe Magazine is published twice a year and summarizes the latest news, trends, presents projects and discussion forums on the topic of fire protection of wood materials.

ISO 9001:2015

Woodsafe instructions, routines, quality assurance in production are quality assured in accordance with ISO 9001: 2015 through notified body RISE (0402)


ISO 14001:2015

Woodsafes systematic sustainable environmental work is quality assured in accordance with ISO 14001: 2015 through notified body RISE (0402)