Masonry Magazine February 2012 Page. 43
Both 2.5 pound and 3.4 self-furring Expanded Metal Lath in a 3-coat stucco over exterior gypsum sheathing attached to six inches X 54mil X 50ksi min. (16 ga) metal studs spaced at 16 inches on center with #8 modified truss screws.
Both 2.5 pound and 3.4 self-furring, Expanded Metal Lath in a three-coat stucco over exterior gypsum sheathing attached to two-X six-inch wood studs (No. 2, SPF or So. Pine) spaced at 16 inches on center with #8 modified truss screws.
Test results are being evaluated now, and will be published for the design industry to access.
In conclusion, expanded metal lath, like many other building materials, is under extreme pricing competition in the marketplace. This competition has resulted in the production, promotion and marketing of laths that do not comply with industry standards or the building code. With these laths offered at discounts to the code-compliant laths, dealers and contractors often choose these products, because they assist with offering a bid with a lower overall cost.
To be certain you are receiving a code-compliant expanded metal lath, have your dealer send a certification from the manufacturer that the metal lath being supplied to your project has been made to the ASTM C-847-10 standard. This also can be noted on markings and or tags on each bundle shipped to your project. This provides additional assurance of installing code-compliant lath. IMAS
Chris Little, CEP, CSI, CDT, LEED Green Associate, is group product manager at Alabama Metal Industries Corp. (AMICO), a North American manufacturer of expanded metal lath and accessories for the stucco and stone industries. For more information, email clittle@gibraltar1.com, or visit www.amico-lath.com.
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