In masonry unit systems, a cavity wall has several advantages, two named in the text are:

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a increased load bearing capacity is provided; and, the wall masonry units are better aligned onto the foundation system

less material is needed which reduces cost; and, the cavity provides a sound barrier

a continuous air space is built, which provides insulation in the wall system; and, a barrier to moisture is provided

a tolerance for brick irregularities is provided to allow the wall to be built plumb; and, the thicker wall dimension accommodates window and door rough-in construction

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