Preface:

This is the fourth edition of CSA O122, Structural glued-laminated timber. It supersedes the previous editions published in 2006, 1989, and 1980.

This Standard contains stress grades for Douglas Fir-Larch, Western Hemlock, Hem-Fir/Douglas Fir-Larch, Lodgepole Pine, Jack Pine, and Spruce. This Standard is intended to be used in conjunction with CSA O177, Qualification code for manufacturers of structural glued-laminated timber.

Changes to this edition include the following:
a) the grade combination for 16c-E Douglas fir/Larch glulam has been changed
b) allowances have been made for the manufacturing glulam products that will have a 1 h and 2 h fire rating
c) procedures to allow the use of edge-glued lamina in glulam have been approved
d) requirements have been added to the Standard for vacuum pressure cycle testing of end joints
e) the sampling requirements have been increased for the vacuum pressure cycle testing of face bonds and reduced for the block shear testing of face bonds
f) a new grade combination for Douglas fir/Larch 24f-E and 24f-EX glulam, which was included in the 2009 revision of CSA O122, is part of this Standard and
g) normative Annex B has been added, for the development of specified strengths and modulus of elasticity for glulam

Scope:

1.1
This Standard provides minimum requirements for the manufacture of glulam of those species specified in CSA O86. Storage, handling, and installation of products subsequent to manufacture are not covered by this Standard.

1.2
The design criteria for glulam manufactured in accordance with this Standard are covered in CSA O86. Requirements for the development of specified strengths and modulus of elasticity for glulam are provided in Annex B.

1.3
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.

1.4
The values given in SI units are the units of record for the purposes of this Standard. The values given in parentheses are for information and comparison only.
Note: For conversion into yard/pound (imperial) equivalents, see Annex A.