Masonry Magazine August 2012 Page. 28
CODES AND STANDARDS
built in place, each panel was connected to four heavy, galvanized steel plate connectors that carry the vertical and lateral wall loads. Connectors similar to precast panel connectors are designed with allowances for in-plane vertical and lateral expansion, contraction and deflection.
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Light-gage studs could be used behind the bricks to support the sheathing, as they were not required to transfer wind or earthquake loads from the bricks.
Typical brick veneer wall ties spaced at 16 inches on-center in each direction were eliminated. Less-frequently placed, larger heavy-steel connections were used. A continuous layer of insulation (uninterrupted by wall ties) was placed behind the bricks. The reinforced structural brick curtain wall was then installed and connected to four strategically placed rigid connectors as shown in the photograph below.
This system reduces the number of penetrations in the moisture, vapor and air barrier caused by frequent wall ties. The reduction in wall ties reduces the thermal conductance of energy through the insulation layer.
A one-inch-thick layer of insulation was placed between brick panels at each window head to isolate floors. The insulation acted like a lintel, by providing support to the bricks during construction prior to the final curing of the grout. The insulation also formed the separation between floors to accommodate seismic drift. IMAS
Jeffrey L. Elder, SE, LEED AP BD+C, is general sales manager for Interstate Brick and HC Muddox and Technical Chairman for Western Clay Products Association, jeff.elder@paccoast.com. Alan Johnson is president of IMS Masonry, a MCAA Certified Masonry Contractor, alan@imsmasonry.com.
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26 MASONRY August 2012 www.masoncontractors.org The Voice of the Masonry Industry