This Standard pertains to wood-based panel products, designed and manufactured
for protected construction uses as roof sheathing, wall sheathing, and floor
sheathing in light frame construction applications. Construction Sheathing
panels primarily comprise three types: all wood veneer; part veneer and part
wood furnish; and all wood furnish.
This Standard requires that the binders used to manufacture panels be
waterproof and boilproof. However, conformance to this Standard does not
qualify panels as Exterior Type suitable for prolonged or permanent exterior
exposure to the elements.
Note: Criteria for panels of Exterior bond quality may be found in CSa
Standards O121, O151, O153, CAN3-O188.3, and CAN3-O437.0.
This Standard establishes five groups of Construction Sheathing products
relating to end use, each specified by means of prescribed test requirements.
Within each group, the Standard establishes levels based on physical, bond
durability, and structural performance criteria appropriate for the intended
application. It specifies Product Qualification tests and criteria based on
the assumption that panels will be installed in accordance with good practice.
Other tests and criteria may be required to characterize panels for special
construction uses or other applications.
This Standard prescribes certain Control Values (which conform to industry
norms) and test methods for establishing other Control Values (which are unique
to individual Products). Taken together, these Control Values set limits
against which an ongoing quality assurance test program may be established.
This Standard requires that all panels represented as conforming to it be
covered by a Mill Specification.
This Standard specifies panel marks that indicate recommended end uses for
This Standard does not cover surface finish of panels such as surface
solidity or smoothness.
This Standard provides an alternative, not a replacement to other Standards
for wood-based panels. The use of the term "Construction Sheathing" in this
Standard is not intended to imply that panels conforming to other CSA Standards
(such as O121, O151, O153, CAN3-O188.3, and CAN3-O437.0) are not construction
The values given in SI (metric) units are the standard. The values given in
parentheses are for information only.