TIMBER: CLADDING
achieve is Euroclass B; Euroclass C is often asked for by specifiers, and untreated timber products rate as Euroclass D and beyond.
The Euroclass classification system expresses a building material’s ‘reaction to fire’: its contribution to fire development in the very early stages when building evacuation is crucial. Each treated product has a Classification Report from a Notified Body (an officially-recognised independent testing body), which also details it performance in generating smoke, denoted by the small letter ‘s’ and a figure, where zero is best. Its ability to generate flaming droplets is additionally denoted by the small letter ‘d’ and a figure, where again, zero indicates best performance. Thus a product may carry a classification for example: ‘Euroclass B s-1 d-0’. From the merchant perspective, such
d etails should be available via the product’s Declaration of Performance and CE-mark summary, providing the DoP has been drawn up after the FR treatment has been applied or incorporated. If in doubt ask your TTF supplier member supplier for advice.
It is also critical for you and your staff to understand that where a Classification Report details the fire rating of a product, its verified performance is very specific. A product that gives a fire rating Classification for a product line which is, for example, a 25mm thick Spruce (Whitewood) board which has been
tested without an air gap behind it and on plasterboard, applies ONLY to that product line and situation. Performance can’t be assumed to apply to other thicknesses of Spruce board, or to a similar thickness of another species such as Pine (Redwood), or to other installation situations or backing materials.
Other factors to be aware of are that conversion of materials on site may alter the product’s performance rating, and that a builder applying additional coatings over an FR-treated product may also affect its fire performance. To augment your product knowledge, look out for products accredited under the WPA’s renowned Benchmark FR quality assurance scheme for FR application processes and materials, and, for structural FR- treated timber products, their FR Build quality scheme, operated in conjunction with the Structural Timber Association.
So that your business can continue to make the most of the growing market for timber cladding, panels, decking and other many other wood products, avail yourself of free training on fire-rated wood products via Wood Campus here:
https://bit.ly/2IELdZe. Ensure your staff know that flame-retardant treatments are available and have undertaken the free online ‘Fire Safety & FR-Treated Timber’ course available on Wood Campus.. Help them to understand the relationship
between FR treatments, end uses and specific installation situations, which can be checked via the product DoP and Classification Report. Lastly, help them to recognise that asking appropriate questions of customers can be of great value in potentially saving lives, as well as building your reputation for knowledge and customer care. BMJ
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