Repairing Cracks Near Corners & Openings
Where cracks are less than 500mm from an external corner or an opening, for example a window, at least 100mm should be bent around the corner and bonded into the return wall or bent and fixed into the reveal, avoiding any DPC membrane.
Where two or more cracks are close together these may be stitched using one continuous length of Helifix HeliBar which must be long enough to extend 500mm beyond the outer cracks. e.g. if there are three cracks, each 250mm apart, then the overall length of Helifix HeliBar required would be 1.5m.
The horizontal slot, normally the mortar bed, can be cut using a twin diamond blade chaser with vacuum attachment, an angle grinder or a mortar chisel.
All mortar must be removed, together with any loose debris, to ensure a sound bond. Prepare the slot with Helifix HeliPrimer WB or thoroughly wet the slot with clean water.
As standard, slots should be 10mm wide to accommodate the 6mm diameter Helifix HeliBar.
Helifix HeliBond grout is the recommended bonding agent. Helifix PolyPlus resin is used for smaller jobs and where loads are to be rapidly applied.