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OSB/3

Oriented Strand Board (OSB) that is conditioned for structural applications in humid environments.

In comparison to Medium Density Fibreboard (MDF), Chipboard and other plywood alternatives, OSB sacrifices a smooth surface for enhanced mechanical performance by using longer strands of wood.

The trade term OSB/3 comes from the technical class denoted in BS EN 300 for ‘load-bearing boards for use in humid conditions’. Humid in this instance meaning environments where boards are protected from external conditions but moisture content can increase because of humidity.

Typical Applications
  • Roof decking
  • Roof sarking
  • Wall sheathing
  • Flooring
  • Packaging
  • Site Hoarding
  • Signboards
  • Portable Buildings
Applicable Standards
  • BS EN 300 – OSB Definition, classification and specification
Environment

Hanson Plywood sources OSB/3 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
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
Size
8mm
9mm
11mm
14mm
15mm
18mm
22mm
2440mm x 1220mm
2397mm x 1197mm
2697mm x 1197mm
2997mm x 1197mm
2400mm x 590mm (T&G on 4 Edges)
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