Crack Stitching Project

Construction – Solid 225mm brick wall

Remedial action

Crack stitches are usually installed in every third or fourth joint (or as specified by engineer) as shown on the photo above. They are generally 1m long (ie to extend 500mm either sided of the crack) and, in the case of the Joint Remedial Anchor system, are installed 50mm into the joint.

Wall Stitching Project

Construction:

Brick cavity wall.

The problem/cause of cracking:

The front elevation was coming away from the building.

Wall stabilisation actions:

Anchors were installed in a staggered pattern (see diagram below) at one metre vertical centres.  The uppermost set of anchors is always installed approximately one metre below the top of the wall ie. there needs to be about a 1 metre weight of wall above the first anchor.

The anchor lengths are varied/staggered to avoid a concentration of stress in any one vertical line.

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