Section Contents

OSB Panel Grades

Examples of APA trademarked OSB panels and popular OSB grades.

OSB Family Dwellings

An APA Performance Rated  panel is engineered for a specific end application.   The panel grade therefore refers to the intended application, for example: Rated Sheathing, Rated Sturd-I-Floor.

The six overall requirements for OSB Performance Rated Panels used in construction applications also make these panels suitable for many industrial and do-it-yourself applications.

APA-trademarked OSB can be used for a variety of end uses including subflooring, single-layer flooring, wall and roof sheathing.  Relative to their strength, the panels are light in weight and easy to handle and install.

OSB shares many of the strength and performance characteristics of plywood.  The combination of wood and adhesives creates a strong, dimensionally stable panel that resists deflection, delamination, and warping. They are able to resist racking and shape distortion when subjected to strong wind and seismic conditions.

1. General
  • Dimensional tolerance and squareness (includes performance category and thickness)
2. Performance
  • Structural performance
  • Uniform loads
  • Concentrated load (static & impact)
  • Nail holding
  • Racking shear
3. Physical properties
  • Dimensional stability
4. Adhesive performance
  • Resistance of the glue line to mould, elevated temperatures and bacteria
5. Bond performance
  •  Meets Exposure 1 classification
6. Moisture Content
  •  The panel must have a moisture content less than 16% at the time of shipment and when tested.


APA in Europe Wizard

All Questions OSBPlywood

What is a ‘life cycle stage’ and how do these link to the environmental assessment of whole buildings?

How do core category rules link with environmental product declarations?

Whose responsibility is it to check that wood products being imported into the EU do not originate from illegally sourced timber supplies?

Does the EUTR require mills to provide any extra documentation for customs entry into the European Union?

Must all plywood and OSB panels carry a CE marking?

What is the definition of a construction product under the CPR?

What is a Declaration of Performance referred to under the Construction Products Regulation?

What is the difference between Structural 1 and Exposure 1?

Does structural panel siding have shear values?

What are mould and mildew, and do they compromise the integrity of engineered wood?

The CE-mark on an APA plywood panel means it conforms to European Standards – but which ones?

I want to use a Rated Sheathing panel for flooring/ roofing application, what info do I need to know?

Plywood: Span rating
OSB: Span rating

What extra strength benefits do Structural 1 OSB panels provide over standard Rated Sheathing panels?

Do APA panels give off formaldehyde?

Plywood: Formaldehyde
OSB: Formaldehyde

What is the difference between a touch-sanded panel and sanded panel?

I’d like to know how APA veneer grades match those given in the European standards

How do I correctly gauge the face appearance a plywood Siding panel?

I want to specify an APA panel for concrete formwork – what do I need to know?

Are APA panels tongue and grooved on all four edges?

I am not familiar with the term ‘Sized for Spacing’ – what is its significance?

How are Performance Category and thickness related?

I’d like to know more about a panel’s Span Rating and how it links to thickness.

Plywood: Span rating
OSB: Span rating

What is Span Rating on the APA trademark and why is it important?

Plywood: Span rating
OSB: Span rating

What is the difference between Exposure 1 and Exterior plywood panels? What are their appropriate uses?

What are the main OSB panels likely to be available in Europe?

What are the main plywood panels likely to be available in Europe?

What are the main European standards that I would need to be aware of for OSB panels?

The main standards are: EN 13986 and EN 300

What are the main European standards that I would need to be aware of for plywood panels?

The main standards are: EN 13986, EN 636, EN 314, EN 635-3