Crack Stitching

Crack Stitching is a method of repairing and stabilising cracked masonry using HeliBars bonded into cut slots with HeliBond cementitious grout.

Masonry may move and crack as a result of movement in foundation soils, seismic activity and cyclical wet and dry, hot and cold environmental conditions. Crack stitching reintroduces structural integrity and redistributes structural loads for a quick, simple, effective and permanent solution.

HeliBar bonded into appropriate bed joints or cut slots with HeliBond grout is the solution to the problem of stabilising cracked masonry.

System Components

  • 1m lengths of HeliBar
  • HeliBond cementitious grout
  • Mortar rake
  • Mixing paddle
  • Applicator with fitted applicator nozzle

1. Using an appropriate power cutting tool, rake out or cut slots into the horizontal mortar beds, to a minimum of 500mm either side of the crack, to the specified depth (typically 25-35mm) and at the specified vertical spacing (typically not more than four brick courses or 340mm apart).

2. Clean out slots with blow pump and apply HeliPrimer WB or flush with water.

3. Using the CS Pointing Gun Kit, inject a bead of HeliBond to the back of the slot.

4. Using a finger trowel, or similar, push the HeliBar into the grout to obtain good coverage.

5. Insert a further bead of HeliBond over the exposed HeliBar, finishing 10-15mm from the face, and ‘iron’ into the slot using a finger trowel.

6. Make good the vertical crack with an epoxy-based weatherproof filler e.g. Crackbond TE. Repoint the mortar bed and make good.

Cracks in brick walls
Cracks in rendered walls
Cracks near corners
Cracks in block walls
Cracks in stone walls
  • Quick, simple, effective and permanent
  • More effective in brick/block masonry than simple crack injection
  • Suitable for all types of masonry including listed and historic structures and those with lime mortar
  • Fully concealed, non-disruptive repair system
  • Stainless steel HeliBars and non-shrink
  • HeliBond grout combine to create excellent tensile strength within the masonry
  • Tensile loads are redistributed along the masonry
  • Masonry remains flexible enough to accommodate natural building movement