Switching to metal stud backups

Summary

Changing from a brick veneer and concrete block backup exterior wall to a brick veneer and metal stud backup (BVMSB) requires a significant redesign of the entire exterior wall system.  One of the weak points of the BVMSB system is the masonry ties that anchor the brick veneer to the metal studs.  These ties should be connected to the steel studs with screws.  About two threads hold this screw in the 16-gauge outside flange of the metal stud.  Thermal bridging at the stud can cause condensation to form at the inside face of this flange in cold weather resulting in deterioration and loosening; this may lead to cracks in the bed joints of the veneer and subsequent water penetration.  The R-value of the wall may also be substantially reduced.  Ways of eliminating thermal bridging are considered.  The US  Brick Industry Association recommendations on brick veneer ties are given.

Primary author(s): Gurevich M

                            New York City Brickwork Design Center

Source: Masonry Constr.

            16,No.1,2003,p.47-49

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