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control-joints

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control joints

Standards
joints or gaps constructed in masonry to control and absorb movements in the masonry. Control joints include the following:
  1. (a) Contraction joints (or opening control joints), which open as the masonry contracts or shrinks.
  2. (b) Expansion joints (or closing control joints), which close as the masonry expands and/or associated concrete shrinks.
  3. (c) Articulation joints, which move to compensate for movements in the supporting structure.
Source - AS 4773.2:2015: Masonry in small buildings