scope:

Application

This Standard specifies requirements pertaining to the quality and uniformity of lumber and establishes the designation "Canadian standard lumber" (see Clause 4) for lumber that meets those requirements.

This Standard covers the following:

a) accreditation board and agency responsibilities (see Clause 5);

b) measurement (see Clause 6);

c) standard sizes (see Clause 7);

d) grading rule requirements (see Clause 8);

e) identification (i.e., grade stamps and certificates) (see Clause 9); and

f) determination of design properties (see Clause 10).

This Standard applies to lumber produced and consumed in Canada, lumber exported from Canada, and lumber imported into Canada.

This Standard provides for the grading of structural lumber by both visual and mechanical means.

This Standard also includes detailed Annexes covering lumber terminology and lumber industry abbreviations.

Exclusions

This Standard does not cover trade practices, grades (other than grading rules and identification), the details of accreditation board and grading agency inspection procedures, or strength and related properties of lumber.

Hardwood lumber

The provisions of this Standard apply to species when the species is included in rules approved by the accreditation board. Although this Standard applies to softwood lumber, it may be applied to hardwood lumber used in applications that ordinarily use softwood lumber.

Terminology

In this Standard, "shall" is used to express a requirement, i.e., a provision that the user is obliged to satisfy in order to comply with the Standard; "should" is used to express a recommendation or that which is advised but not required; and "may" is used to express an option or that which is permissible within the limits of the Standard.

Notes accompanying clauses do not include requirements or alternative requirements; the purpose of a note accompanying a clause is to separate from the text explanatory or informative material.

Notes to tables and figures are considered part of the table or figure and may be written as requirements.

Annexes are designated normative (mandatory) or informative (non-mandatory) to define their application.

Units

The values given in yard/pound units are the units of record for the purposes of this Standard. The values given in parentheses are for information and comparison only.

In keeping with the practice of lumber manufacturers throughout North America, sizes in this Standard are given in board measure units, which are expressed in yard/pound units (see Clause 6.1). Equivalent SI (metric) sizes, rounded to the nearest millimeter, are given in parentheses for the sake of convenience in use and in commercial transactions.

Note: See Annex E for more about how metric dimensions have been calculated for this Standard.