What is Fire Retardant (FR) Plywood and Timber?
FR plywood and timber is material that has been treated to slow the spread of fire propogation and prevent ignition. The spread of flame is measured against a known standard of ENXXX
Why is FR material specified?
Increases the available time to safely evacuate a burning building
Reduces the rate of fire spread
By using FR Plywood or FR Timber you are using material that has passed and been approved to a measured standard as outlined in the Building Regulations.
Treated material behaves and reacts to fire in a known and quantifiable way.
Class B or Class 0 ?
Class 1 and 0 were British standards BS476-7 which had started to be phased out in 2008 and completed by 2013. The standards were replaced by a harmonised European Standard. Document B refers to this harmonisation in section ???
The Buildings Regulations 2000 – Fire Safety – Approved Document B
Volume 1 - Dwelling Houses. Volume 2 - Buildings other than Dwelling Houses.
This is a government document that specifies building regulations concerning fire. Public and private buildings 3m or 4m high.
This document outlines how to build a structure to achieve building “sign-off” from the building inspector. A Fire Officer is also involved.
The Architect and Structural Engineer will refer to Document B.External Link to Document B PDF
Resistance / Reaction to Fire
Resistance is measured in time (e.g. a 30 minute fire door) and usually relates to a composite, an assembled product or a constructed setup.
Reaction usually relates to individual material components, such as timber and plywood, where they are sold with a known and measured reaction to fire.
These are two different tests. Burnblock plywood is certified for both
reaction and resistance to fire (K1 and K2 test)
CE Mark (Conformité Européenne)
The CE mark indicates that a product meets the requirements of the applicable EC directives and is consistent with its Declaration of Performance (DoP) as made by the manufacturer. This must be done before a product is placed on the market.