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This is the third edition of CSA S304, Design of masonry structures, using limit states design principles. It supersedes the previous editions published in 2004, under the designation CSA S304.1, and 1994, under the designation CSA S304.1 and the title Masonry Design for Buildings (Limit States Design). Prior to the limit states design edition in 1994, there were two working stress design editions, CSA S304-M84 and the first edition of CSA S304 issued in 1977 (imperial version) and 1978 (metric version).

Major changes have been made in this edition. The largest changes involve new and revised seismic provisions, including the creation of a separate clause (Clause 16) dedicated to this subject. Clause 16 includes requirements for new and increased seismic ductility-related force-modification factors and the related design limitations. Other new content includes clauses on anchor bolt design and arch design.

The empirical design requirements contained in Annex F have been revised and significant changes to design of dimension cut stone and manufactured stone veneer have been introduced into Annex A. Other major changes include

(a) revised reinforcement provisions for shear walls, including minimum spacing for horizontal reinforcement and continuity requirements for vertical reinforcement;

(b) new strut stiffness provisions for analysis of buildings containing infill shear walls;

© revised shear capacity of beams, including the introduction of both a general and a simplified method of calculating shear capacity of beams based on compression field theory;

(d) revised requirements for reinforcing at intersections between walls;

(e) revised requirements for intermediate longitudinal reinforcement in beams; and

(f) revised limit on maximum bar size allowed from 30M down to 25M.

Users of this Standard are advised that many other clauses contain minor technical and editorial changes to correct or clarify previous requirements.

The masonry industry in Canada has provided funding for the development of this Standard through the CMCA Annual Conference sponsorship.

This Standard was prepared by the Technical Committee on Masonry Design, under the jurisdiction of the Strategic Steering Committee on Construction and Civil Infrastructure, and has been formally approved by the Technical Committee.