High tensile stainless steel crack stitching bars are used to reconnect and strengthen cracked masonry walls. Crack repair rods are bonded into the bed joint to extend 500mm across cracks in walls and can withstand a tensile load of at least 8kN. These bars are available in a selection of sizes.
Stainless steel brick stitching bars have a tensile strength that is double that of conventional rebar and a spiral twist that permits a degree of torsional yield within elastic limits and provides an excellent key for bonding into mortars.
Benefits:
Helix bar repair crack, strength and reinforce cracked brickwork
Redistributes equivalent loads
Low cost and little interruption to install
Work with thixotropic, cementitious grout to enhance the tensile, shear and flexural capacity of masonry walls
Provide resilience against further cracking
Specification:
Stainless steel brick stitching bars have a tensile strength that is double that of conventional rebar and a spiral twist that permits a degree of torsional yield within elastic limits and provides an excellent key for bonding into mortars.
WHO60® is a polymer modified grout that has been specifically formulated to bond crack stitching bars in masonry walls. The structural repair system integrates the axial strength and elasticity of Thor Helical bars with the properties of WHO60® grout to enhance the tensile, shear and flexural capacity of masonry walls.
Anchored across fractures, the Thor Helical crack stitch ties progressively accumulate building loads and disperse them back into the structure, spreading loads and strengthening cracked walls. This effective masonry stitching repair provides resilience against further cracking with minimal cost and little disruption.
Stainless steel bars for crack stitching are supplied in lots of 500 and packed in resale bundles of 10 and 25.
Gallery
Description
International Manufacturer of Precision Engineered Helical Bars, Wall Ties & Fixings
High tensile stainless steel crack stitching bars are used to reconnect and strengthen cracked masonry walls. Crack repair rods are bonded into the bed joint to extend 500mm across cracks in walls and can withstand a tensile load of at least 8kN. These bars are available in a selection of sizes.
Stainless steel brick stitching bars have a tensile strength that is double that of conventional rebar and a spiral twist that permits a degree of torsional yield within elastic limits and provides an excellent key for bonding into mortars.
Benefits:
Helix bar repair crack, strength and reinforce cracked brickwork
Redistributes equivalent loads
Low cost and little interruption to install
Work with thixotropic, cementitious grout to enhance the tensile, shear and flexural capacity of masonry walls
Provide resilience against further cracking
Specification:
Stainless steel brick stitching bars have a tensile strength that is double that of conventional rebar and a spiral twist that permits a degree of torsional yield within elastic limits and provides an excellent key for bonding into mortars.
WHO60® is a polymer modified grout that has been specifically formulated to bond crack stitching bars in masonry walls. The structural repair system integrates the axial strength and elasticity of Thor Helical bars with the properties of WHO60® grout to enhance the tensile, shear and flexural capacity of masonry walls.
Anchored across fractures, the Thor Helical crack stitch ties progressively accumulate building loads and disperse them back into the structure, spreading loads and strengthening cracked walls. This effective masonry stitching repair provides resilience against further cracking with minimal cost and little disruption.
Stainless steel bars for crack stitching are supplied in lots of 500 and packed in resale bundles of 10 and 25.
PRODUCT SPECIFICATION
Thor Helical crack stitching bars are available in AISI304 grade Austenitic Stainless Steel. AISI316 stainless bars are available on special request. The bars are supplied in the following standard sizes
Lengths: 1.0m, 1.5m and 2.0m
Diameter: 5mm, 6mm, 7mm, 8mm and 9mm
TYPICAL PERFORMANCE LOADS in 35-40mm slot at 400mm embedment length (taken from CE Mark Testing)
BS EN 845-1:2013 National Annex NA states that the bars need to provide an equivalent performance to the prescriptive 30mm x 5mm lateral restraint straps and the tension straps should have a declared tensile load capacity of at least 8kN
Bar Diameter
Bars per Joint
Tension Load
6mm
Single Bar
8.39kN
7mm
Single Bar
9.75kN
8mm
Single Bar
11.06kN
9mm
Single Bar
11.50kN
6mm
Double Bar
16.00kN
7mm
Double Bar
17.65kN
8mm
Double Bar
17.65kN
5mm
Triple Bar
14.34kN
Single bars bedded 20mm deep: Double bars placed 15 & 25mm deep: Triple bars buried 10, 20 & 30mm deep. Height of slot at least 3mm greater than diameter of crack stitching bars.
TYPICAL MECHANICAL PROPERTIES OF THOR HELICAL PROFILED BARS
Diameter
CSA (mm2)
0.2% Proof Stress (N/mm2)
Ult Tensile Strength (N/mm2)*
Mean Tensile Capacity #
5mm
6
>880
1025 – 1225
7 kN
6mm
8
>870
1025 – 1225
9 kN
7mm
10
>880
1025 – 1225
11 kN
8mm
13
>790
1025 – 1225
14 kN
9mm
16
>850
1025 – 1225
17 kN
* Ultimate Tensile Strength is measured within a calibrated tolerance of +/- 2%# Mean Tensile Capacity is an indicative value derived from CSA x Mean UTS
This video demonstrates the helical bars being used to create deep brick beams to span a window opening. The stainless steel helical reinforcing bars are bonded with WHO-60 polymer modified grout into cut slots cut into masonry. It offers a quick, simple and durable solution for strengthening and stabalising damaged masonry structures
CE Mark Declaration of Performance Helical Bars (PDF)
