Flame-retardant treatments for timber products
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.
This Wood Information Sheet (WIS) covers treatments that may be applied to wood and wood-based products both factory and site applied to upgrade their 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 (before the 2019 edition), where it is defined by a combination of performance in tests according to BS 476 Parts 6 and 7).
- Types of FR treatment
- Compatability of FR timber products and treatments with additional coatings
- Performance requirements
- Fire test evidence
- CE marking
This Wood Information Sheet was revised in August 2019. The key changes include:
- Class 0, which is found only in Approved Document B to the Building Regulations (before the 2019 edition)
- European classes of reaction to fire performance are now the norm because of the need to comply with European product standards
- Updates to the three types of FR treatments
- Updates to treatments applied on site
- Tables 1 and 2
- UK Building Regulations
- Durability of reaction to fire
- The addition of two new standards for common wood-based products.
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