Section Contents

Thickness and Performance Category

The thickness of the panel is closely linked to the the Performance Category and both have to be displayed on the panel.  The thickness of the OSB panel has to be within the minimum and maximum thickness specification for the designated Performance Category.

Thickness  requirements are based on a tolerance of ±0.8 mm (1/32”) for panels with  Performance Categories of 13/16 and less, and ±5%   for panels with Performance Categories greater than 13/16 unless a closer tolerance is determined through qualification testing.

The manufacturer’s stated thickness of a US trademarked Performance Rated OSB panel is shown as a decimal figure (0.451 IN) in inches. Metric equivalents are provided here for ease of understanding but do not appear on the trade mark.

Recommended OSB Thickness Requirements for each Performance Category

 

 

 

Performance

Category1

OSB Thickness Requirement

Minimum

Thickness

mm          inches

Maximum

Thickness

mm           inches

Recommended Thickness Label2

inches

1/4 PERF  CAT     5.56          0.291     7.14         0.281

Thickness 0.225   IN

11/32 PERF CAT     7.94          0.313     9.53         0.375

Thickness 0.322   IN

3/8 PERF   CAT     8.73          0.344   10.32         0.406

Thickness 0.354   IN

7/16 PERF CAT   10.32          0.406   11.91         0.469

Thickness 0.418   IN

15/32 PERF CAT   11.11          0.438   12.70         0.500

Thickness 0.451   IN

1/2 PERF CAT   11.91          0.469   13.49         0.531

Thickness 0.483   IN

19/32 PERF CAT   14.29          0.563   15.88         0.624

Thickness 0.578   IN

5/8 PERF   CAT   15.08          0.594   16.67         0.656

Thickness 0.609   IN

23/32 PERF CAT   17.46          0.688   19.05         0.750

Thickness 0.703   IN

3/4 PERF   CAT   18.26          0.719   19.84         0.781

Thickness 0.734   IN

13/16 PERF CAT   19.84          0.781   21.43         0.844

Thickness 0.788   IN

7/8 PERF CAT

  21.11          0.831   23.34         0.919

Thickness 0.849   IN

1 PERF   CAT   24.13          0.950   26.67         1.050

Thickness 0.970   IN

1-1/8 PERF CAT   27.15          1.069   30.00          1.181

Thickness 1.091   IN

1-1/4 PERF CAT   30.16          1.188   33.34         1.313

Thickness 1.213    IN

Notes:
1 Acceptable abbreviations are PERF CAT, CAT or Category
2  The recommended thickness label for categories less than 9/16 is 3% above the minimum.  The recommended thickness label for categories greater than or equal to 9/16 are the minimum values for PS1 sanded panels.