For aesthetic reasons, I would like to shift the upper portion of a 4-inch nominal masonry veneer wall out 4 inches. Can this be done with corbeling or is a shelf angle required?
The total horizontal projection of a corbel should not exceed one-half the thickness of the veneer, says the Brick Institute of America (BIA) in its Technical Notes 36A, "Brick Masonry Details, Caps and Copings, Corbels and Racking." Also, the projection of any single course should not exceed one-half the height of the unit or one-third the bed depth of the unit, whichever is less. For a nominal 4-inch masonry veneer wall, this limits the corbel to 1 3/4 inches. To achieve a 4-inch offset in this wall, the wall must be reinforced or a shelf angle must be provided.