Call us today with your enquiry 01422 330 444

Fire Retardant OSB

Oriented Strand Board treated with a fire retardant solution during production.

Our stocks of Fire Retardant OSB are sourced from SmartPly. The boards are treated with a Zeroignition® Solution, which is a water-based and eco-friendly fire retardant. This ensures that the structure of the board is not compromised and the product maintains a full CE Mark following treatment.

FR OSB/3 panels are suitable for interior, structural use in conditions where humidity may fluctuate. SmartPly produce both Euroclass B and Euroclass C Fire Retardant OSB panels and we are able to stock both.

Typical Applications
  • Roofing
  • Flooring
  • Wall sheathing
  • Furniture
  • Shop fitting
  • General Joinery
  • Exhibition stands
  • Hoarding
Applicable Standards
  • BS EN 300 – OSB definition, classification and specification.
  • BS EN 13501-1 – Single Burning Item Test
  • EN ISO 11925 – Ignitability test.
  • European Class B/C Fire Ratings
  • SMARTPLY FR/FR BUILD OSB3 is a flame retardant panel developed in response to the STA’s (Structural Timber Association) “Design guide to separating distances during construction” for timber frame buildings above 600m2 total floor area

Hanson Plywood sources Fire Retardant OSB from FSC® Certified forest concessions from the UK and Republic of Ireland. The company’s robust Chain of Custody management system ensures that these certifications are respected and adhered to throughout the supply chain. For further information, please refer to our Environment Page.

Quick Reference Guide - OSB
Application & Climatic Conditions
Use Class (EN 335)
Non-Structural, interior fitments including furniture
Use Class 1
Internal, structural applications
Use Class 1
Structural applications similar to those listed above, however OSB/3 is is suitable for use in humid conditions
Use Class 1 & 2
Heavy-duty structural applications in humid conditions
Use Class 1 & 2
Quick Reference Guide – Fire Ratings

A request we commonly receive is that for a panel with a 1 hour or ½ hr fire rating.

30 or 60mins relates to the concept of Fire Resistance and typically relates to the ability of an elevation or door to withstand the passage of a fully developed fire for said amount of time.

Euroclass relates to the concept of Reaction to Fire and focuses on initial fire growth phase. A Euroclass rated panel may form part of a fire barrier system requiring 30 or 60 mins Fire Resistance overall. We recommend that suitability of a Euroclass rated panel within the design is based upon 3rd party assessment or independent testing specific to the project in question.

There are 7 Euroclass classifications ranging from A1 to F. In line with the Construction Products Regulation (2013) each Euroclass rating requires testing against the relevant European fire test methods – see table below.

Hanson Plywood offer a range of panels manufactured with an A1 rating (see below). Untreated wood-based panels such as plywood, OSB, MDF & Chipboard typically achieve a Euroclass D or E rating. Fire rated panels can be supplied to a Euroclass B or Euroclass C fire performance as required depending upon regulatory requirements.

European Test Standard
National Class (England & Wales)
National Test Standard (England & Wales)
BS EN ISO 1182 BS EN ISO 1716
BS 476: Part 4
BS EN ISO 1182 BS EN ISO 1716 BS EN 13823
Limited combustibility
BS 476: Part 11
BS EN 13823 BS EN 11925-2
BS 476: Part 6 BS 476: Part 7
BS EN 13823 BS EN 11925-2
1 & 2
BS 476 : Part 7
BS EN 13823 BS EN 11925-2
BS 476: Part 7
BS EN 11925-2
BS 476 : Part 7
No performance determined
No Test
2397mm x 1197mm
FR Build
2397mm x 1197mm
FR Euroclass C/Bfl
Want to know more about Fire Retardant OSB? Simply fill out our Quick enquiry form or call us on 01422 330 444