scope:

This Standard pertains specifically to a class of mat-formed structural panelboards made predominantly of wood strands or wafers of a minimum and controlled length, a controlled thickness, and a variable or predetermined width, bonded together with a waterproof and boilproof binder.

These panelboards are intended, and used extensively, for construction applications requiring durability, load-carrying capacities (strength and stiffness), and dimensional stability. Uses, however, are not limited to such applications.

This Standard covers two panelboard types identified as OSB (oriented strandboard) and waferboard, and establishes three grades for their manufacture. 

Grade requirements are prescribed in terms of dimensional, physical, and mechanical property limits appropriate for characterizing a mat-formed, structural panel product intended primarily for common construction applications. Binder durability is specified in terms of bond strength after a two- hour boil test.

This Standard specifies grade and other marks for OSB and waferboard.

This Standard does not preclude the manufacture of OSB or waferboard with specified properties in addition to or in excess of those for grades in this Standard.

This Standard does not identify specific construction applications for the different grades and thicknesses. Tests and criteria required to characterize the product for special co nstruction uses, or other applications, are not specified. Note: Methods and criteria for the determination of the structural capabilities of panel products vary from country to country, and approval for the use of a product for a specific structural application is the responsibility of the governing code or regulatory authority. Appendix A of CSA Standard O437.1 lists a number of test methods that have been used to evaluate the structural performance capabilities of OSB and waferboards for specific end uses.

This Standard does not apply to exterior bonded panelboards made wholly or in part of particles, flakes, fibres, or strands other than as defined herein. Note: This is not intended to imply that such other panels are not suitable for similar construction end uses. The limitation in this Standard to a specific type of particle is based on a history of proven performance in building construction of boards made of wafers.

This Standard does not apply to OSB and waferboard products that are evaluated and marked solely in accordance with CSA Standard CAN/CSA-O325.0. Note: OSB and waferboard may be evaluated and marked as complying with more than one Standard. Such panels are required to comply with all applicable requirements for each Standard identified on the panel.

The values given in SI (metric) units are the standard. The values in parentheses are for information only.