Crack Stitching

Cracked masonry is best stabilized by bonding HeliBar stainless steel bars into appropriate bed joints or cut slots. Tensile loads are redistributed along the masonry to minimize further developments of the crack which may occur with simple injection methods.

1. Rake out or cut slots into the horizontal mortar beds, a minimum of 18” either side of the crack, to the specified depth.

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 at least ½” from the face, and ‘iron’ into the slot using a finger trowel.

6. Repoint the mortar bed and make good.

7. Make good the vertical crack with an epoxy-based weatherproof filler. e.g. CrackBond TE.

System Components

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

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 stabilization with no additional stresses.

Technical Specifications

Available diameters - 4.5, 6 and 8mm.
Available lengths - cut lengths up to 3’ or 4’ 6”.
Material - Austenitic stainless steel.
Vertical spacing - Every 2-6 brick courses.
Depth of slot - Single skin/cavity wall 1”-1¾” (25-35mm) Solid wall 1½” -1¾” (35-45mm).

Repairing cracks near corners and openings
Where cracks are less than 18” from an external corner (A) or an opening (B) at least 4” 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

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 18” beyond the outer cracks. e.g. if there are three cracks, each 9” apart, then the overall length of HeliBar required would be 4’ 6”.
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 HeliPrimer WB or thoroughly wet the slot with clean water.
As standard, slots should be 3/8” (10mm) wide to accommodate the 6mm diameter HeliBar.
HeliBond grout is the recommended bonding agent. PolyPlus resin is used for smaller jobs and where loads are to be rapidly applied.
Compatible with lime mortars.

Applications

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Crack Stitching

Cracked masonry is best stabilized by bonding HeliBar stainless steel bars into appropriate bed joints or cut slots. Tensile loads are redistributed along the masonry to minimize further developments of the crack which may occur with simple injection methods.

1. Rake out or cut slots into the horizontal mortar beds, a minimum of 18” either side of the crack, to the specified depth.

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 at least ½” from the face, and ‘iron’ into the slot using a finger trowel.

6. Repoint the mortar bed and make good.

7. Make good the vertical crack with an epoxy-based weatherproof filler. e.g. CrackBond TE.

System Components

Benefits

Technical Specifications

Repairing cracks near corners and openings
Where cracks are less than 18” from an external corner (A) or an opening (B) at least 4” should be bent around the corner and bonded into the return wall or bent and fixed into the reveal, avoiding any DPC membrane.

Repairing cracks near corners and openings
Where cracks are less than 18” from an external corner (A) or an opening (B) at least 4” should be bent around the corner and bonded into the return wall or bent and fixed into the reveal, avoiding any DPC membrane.

Related Links

Recent Projects

Download

Applications

Send to a friend

Crack Stitching

Cracked masonry is best stabilized by bonding HeliBar stainless steel bars into appropriate bed joints or cut slots. Tensile loads are redistributed along the masonry to minimize further developments of the crack which may occur with simple injection methods.

1. Rake out or cut slots into the horizontal mortar beds, a minimum of 18” either side of the crack, to the specified depth.

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 at least ½” from the face, and ‘iron’ into the slot using a finger trowel.

6. Repoint the mortar bed and make good.

7. Make good the vertical crack with an epoxy-based weatherproof filler. e.g. CrackBond TE.

System Components

Benefits

Technical Specifications

Repairing cracks near corners and openings Where cracks are less than 18” from an external corner (A) or an opening (B) at least 4” should be bent around the corner and bonded into the return wall or bent and fixed into the reveal, avoiding any DPC membrane.

Repairing cracks near corners and openings Where cracks are less than 18” from an external corner (A) or an opening (B) at least 4” should be bent around the corner and bonded into the return wall or bent and fixed into the reveal, avoiding any DPC membrane.

Related Links

Recent Projects

Download

Repairing cracks near corners and openings
Where cracks are less than 18” from an external corner (A) or an opening (B) at least 4” should be bent around the corner and bonded into the return wall or bent and fixed into the reveal, avoiding any DPC membrane.

Repairing cracks near corners and openings
Where cracks are less than 18” from an external corner (A) or an opening (B) at least 4” should be bent around the corner and bonded into the return wall or bent and fixed into the reveal, avoiding any DPC membrane.