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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 question we are frequently asked is which fire rated panel will provide 30 minute or 60 minute fire resistance. The answer of course is not straight forward and although fire rated panels can be used as part of a fire barrier system, such as partitions, the finished design requires additional independent testing to achieve such a rating.

Since the introduction of the Construction Products Regulation (CPR) Fire retardant panels are tested against EN13823:2002 (SBI or Single Burning Item Test) and EN11925 (Ignitability Test) and given a rating against their performance.

SBI is the key test and records parameters relating to the rate of fire growth, lateral flame spread, heat release and smoke emission.

There are seven Euroclass Classifications for fire performance of different construction materials ranging from A1 and A2 through to F. Classifications for wood based panel products such as Plywood, MDF and Chipboard include B, C, D and E. Euroclasses D and E relate to untreated material.

Performance Description
Fire Scenario
Heat Attack
Examples of Products
No contribution to fire
Fully developed fire in a room
At least 60kW/m2
Products of natural stone concrete, bricks, ceramic, glass, steel and many metallic products
No contribution to fire
Fully developed fire in a room
At least 60kW/m2
Products similar to those of class A1, including small amounts of organic compounds
Very limited contribution to fire
Single burning item in a room
40kW/m2 on a limited area
Gypsum boards with different (thin) surface linings. Fire retardant wood-based panel products
Limited contribution to fire
Single burning item in a room
40kW/m2 on a limited area
Phenolic foam, gypsum boards with different surface linings. Flame retardant wood-based panel products (thicker than in class B)
Acceptable contribution to fire
Single burning item in a room
40kW/m2 on a limited area
Wood-based panel products with thickness > about 10mm and density > about 400kg/m3 (depending on end use)
Acceptable contribution to fire
Small flame attack
Flame height 20mm
Low density fibreboard, plastic based insulation products
No performance requirements
Small flame attack
Flame height 20mm
Products not tested (no requirements)
2397mm x 1197mm
2397mm x 1197mm
FR Build OSB/3
Want to know more about Fire Retardant OSB? Simply fill out our Quick enquiry form or call us on 01422 330 444