Oriented Strand Board treated with a fire retardant solution during production.
Fire-resistant OSB must be installed in strict accordance with the manufacturer’s recommended guidelines to ensure performance and compliance.
Fire Retardant OSB
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Typical Applications
- Roofing
- Flooring
- Wall sheathing
- Furniture
- Shop fitting
- General Joinery
- Exhibition stands
- Site 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 Fire Ratings
Environment
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.
Downloads & Links
Quick Reference Guide - OSB
Type
Application & Climatic Conditions
Use Class (EN 335)
OSB/1
Non-Structural, interior fitments including furniture
Use Class 1
OSB/2
Internal, structural applications
Use Class 1
OSB/3
Structural applications similar to those listed above, however OSB/3 is is suitable for use in humid conditions
Use Class 1 & 2
OSB/4
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.
Class
Performance description
National Class
(England & Wales)
National Test Standard
(England & Wales)
A1
BS EN ISO 1182
BS EN ISO 1716
BS EN ISO 1716
Non-combustible
BS 476: Part 4
A2
BS EN ISO 1182
BS EN ISO 1716
BS EN 13823
BS EN ISO 1716
BS EN 13823
Limited combustibility
BS 476: Part 11
B
BS EN 13823
BS EN 11925-2
BS EN 11925-2
0
BS 476: Part 6
BS 476: Part 7
BS 476: Part 7
Bfl (Flooring only)
EN ISO 9239-1
EN ISO 11925-2
EN ISO 11925-2
N/A
N/A
C
BS EN 13823
BS EN 11925-2
BS EN 11925-2
1 & 2
BS 476 : Part 7
D
BS EN 13823
BS EN 11925-2
BS EN 11925-2
3
BS 476: Part 7
E
BS EN 11925-2
4
BS 476 : Part 7
F
No performance determined
Unclassified
No Test
Size
Type
16mm
19mm
2500mm x 1250mm
FR OSB/3 Euroclass B
