Masonry Crack Stitching
SIMPLE & DISCREET - NO REBUILDING - NO UPHEAVAL - NO MESS – NO FUSS
BENEFITS
Anchored across fractures the grouted helical crack repair ties generate excellent compressive and axial strength to reinstate
the structural integrity of distressed masonry to its pre-cracked strength and to provide resilience against further cracking.
Under axial loads the crack stitch tie becomes stressed within the wall. This torsional build up enables the spiral bar to
progressively accumulate load & to disperse it at tangential angles to its helix along the full length of the reinforced zone to
fully reinstate the structural integrity of distressed masonry and provide resilience against further cracking. The redistribution
of stress along the rods full length alleviates the incidence of sudden and catastrophic failures.
METHOD STATEMENT
| 1. |
Chase 10mm slots at 340mm intervals, (every 4 courses), along a length of wall that extends 500mm each side of crack. Depth of slot – refer to table with allowances made for any render/plaster finish. |
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| 2. |
Clear loose detritus from slots ensuring exposed brick surfaces are cleaned of mortar and flush thoroughly with water, or treated with a suitable primer. |
| 3. |
Pump bead of Thor Helical D.U Grout to rear of slot, filling it evenly to approximately two thirds full. |
| 4. |
Push Thor Helical 6mm crack stitching tie into grout to approximately two thirds of slot depth. Trowel displaced grout to firmly encapsulate rod. |
| 5. |
Make good wall chase to disguise slot. Repair cracks between the helically reinforced masonry with appropriate and discreet filler. |
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*Where installation occurs within 500mm of an opening or corner the wire MUST extend and be bonded a minimum of 100mm around the corner. |
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Thor 6mm Remedial Crack Stitching/Expansion Joint Application Guide – Tolerance -0mm/+5mm |
| Wall Thickness & Application |
Depth of Slot |
Single 6mm Thor Wire Depth |
D.U. Beads |
| 110mm |
Crack Stitch |
35mm |
25mm |
2 |
| 110mm |
Expansion Joint |
40mm |
35mm |
2 |
| 230mm Solid Wall |
Crack Stitch |
40mm
(Under Header Courses if possible) |
35mm |
2 |
| 230mm Solid Wall |
Expansion Joint |
45mm |
40mm |
2 |
| 270mm Cavity Wall |
Crack Stitch |
35mm Both Single Leaves |
30mm |
2 |
| 270mm Cavity Wall |
Expansion Joint |
40mm Both Single Leaves
(Additional wall ties may be required) |
35mm |
2 |
| 350mm Solid Wall |
Crack Stitch |
45mm Both External Leaves
(Under Header Courses if possible) |
40mm |
2 |
| 350mm Solid Wall |
Expansion Joint |
45mm Both External Leaves |
40mm |
2 |
Download PDF Brochure: THOR Remedial Crack Stitching
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Click the image to the left to view the Masonry Crack Repair Video |
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