Masonry Magazine October 1980 Page. 12
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BIA COMMENTARY
Brick Veneer/Metal Studs
-Alan H. Yorkdale, P.E., Vice President
Engineering and Research
Brick Institute of America
As many members of the masonry industry are aware, for the past year or so the Brick Institute of America, Engineering and Research Division, has been involved in a disagreement with the Metal Lath/Steel Framing Association, which represents the manufacturers of steel studs, over design recommendations for use with brick veneer. This is the type of disagreement that can occur when honest technical people look at a situation from different points of view and with different backgrounds.
At the core of this disagreement is the Brick Institute of America's Technical Notes on Brick Construction 28B Revised, "Brick Veneer-Panel and Curtain Walls," which is contained in this issue of MASONRY. The first issue of Technical Notes 28B was published in February, 1979. This Technical Notes deals essentially with the design of brick veneer with steel stud backup systems on buildings of three stories and above. The metal stud manufacturers and their association objected to some of the recommendations contained in the Technical Notes, calling for a more rigid backup system than that recommended by the steel stud industry.
The lightweight steel framing people generally recommend a maximum allowable deflection, under full load. in a story height of steel studs, of L/360. Based on our best engineering judgment, BIA's recommendation is L/600 to L/900 as a maximum permissible deflection. The BIA recommendation would result in heavier gauge metal and a deeper stud, i.e., 6 inches or better, as opposed to 3% or 4-inch depth of stud. The Metal Lath/Steel Framing Association also felt that we were "too negative" in our discussions of the system.
With respect to these issues, the Brick Institute of America has taken the following positions:
* It is our responsibility to provide the design professional with suitable details and recommendations, which, if followed with judgment, will result in the successful performance of brick masonry walls.
* Being a "new" system and an adaptation from single-family housing, there is a dearth of information on the proper detailing and on the execution of these details for brick veneer over steel stud backup.
* It is neither our intention, nor our purpose, to cause problems for the metal stud manufacturers and their marketing efforts, particularly since this wall system provides a significant market to the brick industry.
The use of steel studs as a backup system for brick veneer on commercial, industrial and multi-residential projects has had a direct effect on several other segments of the masonry industry, i.e., the mason contractor, the bricklayer, and the concrete block industry. Some of the organizations representing these groups, both on a national and on a local level, have developed and published articles and/or advertisements that made use of parts of the information contained in the BIA Technical Notes to try to discredit the steel backup system, and to help them maintain or recapture their markets. It should be noted that all of these articles and advertisements as well as the use of "quotations from our Technical Notes" are beyond the control of the Brick Institute of America.
We have made several attempts to resolve the disagreement. Among these efforts include the executive and technical staffs of the Brick Institute of America meeting with the representatives of the Metal Lath/Steel Framing Association and the American Iron and Steel Institute on several occasions. As a result of these meetings, and in an attempt to foster inter-industry harmony, several steps were agreed to:
1. The Brick Institute of America would re-issue the Technical Notes 28B. removing some of the "inflammatory" language. This is the Technical Notes that is included with this issue, 28B Revised.
continued on page 27