When first published by the Masonry Standards Joint Committee in 1988, the Building Code Provisions for Masonry Structures, ACI 530/ASCE 5 (MSJC Code) and Specification for Masonry Structures, ACI 530.1/ASCE 6 (MSJC Specification) represented a breakthrough for masonry design. It soon became apparent, however, that the MSJC Code and Specifications would need periodic revision to maintain their usefulness. The documents and their associated commentaries were first revised in 1992. A second revision, approved in 1995, has just been published. Following are some of the most significant changes to appear in the 1995 Code. CHAPTER 10. SEISMIC DESIGN REQUIREMENTS In the 1992 edition of the Code, seismic design was covered in Appendix A, an optional add-on, and the seismic design provisions were based on seismic zones 0, 1, 2, 3, and 4. The 1995 MSJC Code deletes Appendix A and replaces it with a new Chapter 10, in which the design requirements have been updated to be consistent with provisions of the National Earthquake Hazard Reduction Program (NEHRP). CHAPTER 11. GLASS UNITY MASONRY Another new chapter in the Code addresses glass block masonry as a non-loadbearing material in interior or exterior walls, used either in panels or in continuous bands. CHAPTER 12. VENEERS The new Chapter 12 of the MSJC Code covers anchored masonry veneer, defined as a wythe of masonry not relied on as part of the wall's system of resistance to applied loads. GENERAL CHANGES Besides the three new chapters and changes (such as references) required in other sections by their addition, the 1995 revisions are relatively minor. Metric equivalents have been added in parentheses following all references to units of measurement throughout the Code and Specification. Language has been clarified in some sections and adjusted to reflect newly defined terms in others.