Yes, CE marking is a legal requirement from the EU. All requirements can be found in the EU Construction Products Regulation CPR 305/2011 and apply to both solid wood and wood-based panels. For fire impregnated wood, the manufacturer must hold a Certificate of Constancy of Performance (CE certificate) according to control system 1, unlike regular untreated wood, for which the manufacturer can issue a Declaration of Performance according to control system 4.
If a panel is installed with an air gap despite the fact that the fire class prohibits it, you have a problem. In order to use a fire retardant treated wood panel, the additions described in the CE marking appendix must be taken into account. It is not allowed to perform an instalment with spaced boarding when the opposite has been approved, i.e. an installation where there is no air gap.
The fire classification of a material takes into account various properties that each may contribute to the performance of the product; these may for example be physical properties of the material such as density, thickness, air gaps, exposure, surface treatment, instalment conditions, etc. It is common that customers only look at the fire class, eg. B-s1, d0 while other important properties are forgotten. It is therefore important to pay attention to the importance of the air gap.
If a wood panel is installed without an air gap directly on plaster, smoke generation decreases even if the fire spreads through the wood panel. If, however, there is an air gap, then the fire will go directly through it and double the area on which the smoke is spread. This means that a fire class B-s1, d0 may as well become a B-s2, d0 or in the worst case a B-s3, d0. Smoke is the most common cause of death in a fire, so the question of air gaps is much more important than many people think — if not completely vital.
The decision to install spaced boarding must therefore be made by considering all verified properties so that the correct fire rating is achieved, including the air gap.
An exterior wooden panel is exposed to weather daily. This places high demands on the fire retardant treatment agent that must remain intact and not be leached. The active ingredients in the fire retardant treatment agent therefore play a crucial role when the wood panel is to be used in an outdoor environment.
The point of impregnating a wood panel with a fire retardant treatment agent is to provide lasting protection against fire. The active constituents in the agent also have a task that is equally important which is to withstand the test of time; they must provide long term durability and not wear off.
Fire retardant treatment and durability are two factors that must be taken into consideration regardless of whether you are in the regulatory or executive phase.
Below, you will find the most important factors to consider in order to ensure fire safety in a humid environment.
Fire safety is about so much more than a fire class. Therefore, avoid investing in a fire retardant treated wood panel that does not have adequate durability of reaction to fire properties. By using fireproofing agents that cannot cope with the challenges that arise over time, the life cycle cost of the building will be increased due to an increasing need for future renovations.
Euroclass B refers to the product's reaction to fire properties according to the classification standard EN13501-1. Regular untreated wood meets D-s2, d0 requirements, while some fire impregnated products meet B-s1, d0 requirements. The SP-Fire 105 refers to an exterior wall cladding that has been fire tested according to the principles of facade construction.
A classification typically clarifies the result of a fire test, while a certification is an official approval of the product when done in accordance with a specific product standard. A certified product is always covered by manufacturing control and quality assurance, while a classified or fire tested product is not.
Contact a fire consultant. The rule of thumb is that tall wooden facades (more than two storeys), escape routes, roof and wall claddings of public buildings, sports facilities, community centres, etc. must be fireproofed. Seek advice from a renowned fire consulting company just in case.
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