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Corner stitching in a masonry retrofit addresses

  • A.the excessive weight of the roof structure bearing on the tops of the walls
  • B.separation of walls meeting at a corner
  • C.cracking at the centre of large wall panels away from any opening or corner
  • D.settlement of the foundation beneath one corner of the building relative to another

Answer: B

Corners are where two walls must act together and where the shaking pulls them apart, so cracking begins there. Stitching with bars or with mesh restores the connection and is normally combined with bands at lintel level.

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