Masonry Magazine September 2010 Page. 33
With numerous types of anchors on the market, especially for steel stud assemblies, and anchor styles that feature either a single attachment or dual attachment, it can be difficult for designers to verify whether a product will successfully maintain a properly sealed connection with the air/vapor barrier. Testing is required confirm that an anchor system can fulfill the requirements of the modern masonry wall. This is being accomplished with the new ASTM E-2357 testing method, which is the standardized method for determining air leakage of air barrier assemblies. This testing procedure should give peace of mind to both the designer and installer, that the anchor system they have specified, if properly installed, will function as intended.
Another significant issue these days is the increased width of many wall cavities. This increase is occurring because of two major reasons. First, the masonry industry now recommends a two-inch clear air space behind all veneer systems. Second is the ever-increasing desire for energy-efficient buildings, which require thicker units of rigid insulation. Designers have been moving away from batt insulation in steel stud assemblies to rigid insulation in the cavity as a way to push the "dew point" of the wall assembly outboard of the sheathing material, plus rigid insulation creates a more continuous layer of protection from the elements. Additionally, the move toward rigid insulation in the cavity is being prompted by code requirements in certain states and, potentially, a national code change in the near future. The Brick Industry Association states that 4.5 inches is the maximum dimension from the outer face of CMU or sheathing to the back side of a veneer material that can be handled by a "standard" anchoring system. Anything over 4.5 inches requires an "engineered anchoring system." In many northern parts of the country, insulation amounts already have created cavities well over the standard category. High-strength anchoring systems are necessary to meet these newer design requirements created by increased wall cavity widths, and have become absolutely essential in areas with high-wind loads, especially when they are used in multi-story structures. Seismic activity, and its potentially detrimental effects on masonry walls, as seen recently in the tragic events in Haiti, also requires the use of high-strength products that can withstand the punishment of natural disasters. High-strength systems generally include heavier gauge wire and metal components that
Loop type reinforcement system that eliminates the potential disengagement of the anchor.
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Construction Tie Products, Inc. is commited b supplying the highest quality masonryte and construction systems in North America and saltisfying all stringent national codes and standards for today's building structures. CTP, Inc. promises to be a miliable product source along with on-time business integrity for all demanding builders.
READER SERVICE #250
September 2010
CTP
7974 W. Orchard Drive
Michigan Cty Indiana
46360-9390-USA
Phone: (219) 878-1427
Contact: Steve Getz, BSCE
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MASONRY 31