Helifix
Cracked masonry is best stabilised by bonding HeliBar stainless steel bars into appropriate bed joints or cut slots. Tensile loads are redistributed along the masonry to minimise further developments of the crack which may occur with simple injection methods.
Benefits
- Quick, simple, effective and permanent.
- HeliBar and HeliBond grout combine to produce an excellent bond within the substrate.
- Masonry remains flexible enough to accommodate natural building movement.
- Non-disruptive structural stabilisation with no additional stresses.
Measurements
- Available diameters - 4.5, 6 and 8mm.
- Available lengths - cut lengths up to 1.5m.
- Material - Austenitic stainless steel.
- Vertical spacing - Every 2-6 brick courses (150-450mm).
- Depth of slot - Single skin/cavity wall 25-35mm Solid wall 35-45mm.
Repairing cracks near corners and openings
Where cracks are less than 500mm from an external corner (A) or an opening (B) 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.
Points to Note
A. Where two or more cracks are close together these may be stitched using one continuous length of 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 HeliBar required would be 1.5m.
B. 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.
C. All mortar must be removed, together with any loose debris, to ensure a sound bond.
D. Prepare the slot with HeliPrimer WB or thoroughly wet the slot with clean water.
E. As standard, slots should be 10mm wide to accommodate the 6mm diameter HeliBar.
F. HeliBond grout is the recommended bonding agent. PolyPlus resin is used for smaller jobs and where loads are to be rapidly applied.
G. Compatible with lime mortars.