S-stitch Technical Information

Technical Summary

NOTE: For a rigid, permanent, full-depth repair, all S-Stitches and accessory plates must be fully encapsulated in our AE-2200-250 Anchoring Epoxy.

To correct cracking of a beam or slab the American Concrete Institute (ACI 224.1R-07) outlines post-tensioning anchor stitching as desirable to strengthen the fractured area. As with any repair, the extent and cause must be identified and addressed.

The AquaStitch S-Stitch technique uses Stress Proof®, cold-rolled 1144 steel rods, anchored into solid concrete to bridge the crack and stabilizing force across the fracture.

The S-Stitch by AquaBond® concrete repair staples bridge the crack by extending into the unaffected, solid reinforced concrete. Future movement is prevented by embedding the 115,000 lb. tensile strength rod in high-strength anchoring epoxy along the length of the S-Stitch”.

Other integral components of the S-Stitch system are two machined steel components — the Stitch Adaptor Plate and the Stitch Bridge Adaptor.

The Stitch Adaptor Plate enables anchoring of the S-Stitches anywhere along a “run” and also serves to pin down, align and intersect S-Stitches in unlimited configurations to achieve the best repair of any cracked concrete as needed.

S-stitch-adaptor-plate and bridge-adaptor
S-stitch adapter plate and bridge

The Bridge Adapter lets you interlock a run of stitches and provides an integral terminal at which a continuation, corner or direction-change can be accomplished.

A hole in the Stitch Plate Adaptor accepts the custom expanding anchor stud. When the nut on the anchor is tightened, the anchor expands, locking the S-Stitch permanently into the concrete.


After establishing your Adapter Plate positions for a configuration such as a corner repair, hold them in place by pre-gluing the adapter plates onto the S-Stitches with our fast-curing, SR-3000 Structural Repair Compound.

Once the S-Stitches are anchored into the structural sub-concrete with Anchoring Epoxy and Expanding Anchors, fewer loads are exerted on the weaker surface and are transferred into actual reinforced areas beneath.

SAA-25-S-stitch Adapter-Plate-with-Anchor

S-stitch Performance

Technical Specifications:

S-Stitch Installation and Materials Guide 

Item: S-Stitch by AquaBond®

  • Description: Engineered structural system to stitch or staple fractures in reinforced concrete
  • Device: S-Stitch by AquaBond®
  • Installation Spacing: 1-foot, or as needed per engineer’s specifications (can vary depending on crack severity)
  • S-Stitch Tensile Strength: 115,000 psi
  • Anchor: 2-1/4″ x 5/8″ custom, expanding sleeve type
  • S-Stitch dimensions: 1/4″ thick. Available in four lengths: 6″, 12″, 18″ and 24″
  • Hook Length: 1″ +-
  • Bridge Length: 6″ minimum, can be extended to longer repairs with longer S-Stitches and use of Bridge Adapter and Adapter Plates
  • Expanding Anchor Length: 2-1/4” overall.
  • Bridge Connector Material: Precision machined, case hardened 1018 steel
  • S-Stitch Material: 1144 StressProof®cold rolled steel
  • Channel for S-Stitches: 3/8″ wide, and down 1/2″ to 2″ depth into the original concrete structure, as specified by a qualified engineer, or onsite field determination by a licensed contractor.
  • Corrosion Resistant: S-Stitch’s components have a proprietary anti-corrosion coating, encased in anchoring epoxy when installed per instructions
  • Patent Pending

     • 4″ Masonry Saw, Chaser Blade, Hammer Drill, 5/8″ Masonry Drill Bit
     • 3/4″ Socket Wrench, Caulking gun, Shop Vacuum


      StressProof®is a registered trademark of Niagara LaSalle Corporation