Rules & regulations

Timber materials must comply with the following standards:

British Standards

• Timber used in construction and displays under 25mm thick must be impregnated to Class 1 standard, in accordance with BS 476 - Part 7. The exception to this is MDF, which is acceptable for use due to its density
• Note: Treated boards will have BS 476 - Part 7 - Class 1 marked on them Spanish or M Class
  
  

Spanish or M Class

• Laminated wood more than 18mm thick or non-laminated between 5mm and 18mm shall be labelled or certified to M3. Non-laminated wood more than 18mm should be assumed to comply with M3 without the need for supporting documentary evidence
• Wood-based composite or plywood below 5mm requires to be M1 supported by reports. It may also be impregnated with suitable fire proofing substances applied by an approved method to M2 standards if certificates are supplied with the name of the product, a description and date of the approved applications
  
  

European Standards BS EN 13501

• For M1 class above read A1, A2 or B classes. For M2 read A1, A2, B or C. For M3 read A1, A2, B, C or D. Documentary evidence is required and should be submitted along with your plans