What is the disadvantage of cold-formed steel (CFS) stud backup for brick veneer as compared with CMU backup?
What will be an ideal response?
CFS stud assembly is far more flexible, i.e., it deflects considerably more than a CMU wall for the same lateral load. Because the deflection of backup and brick veneer must be identical, a large deflection of brick veneer opens its bed joints, increasing water penetration and reducing the veneer's durability. For CFS stud assembly to have the same stiffness as a CMU wall, the studs need to be of heavier gauge and more closely spaced, which makes it costlier than a CMU backup.
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