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