Why the Grid Stitch Outperforms Staple-Style Crack Repairs

At first glance, a carbon fiber staple or stitch with raised ends might look stronger than the flat design of our patented Grid Stitch. In fact, our original crack repair product also included end tabs—just like many others still do today. But through testing and development, we discovered a more effective solution based on the proven technology behind our ICC-certified InvisiBeam wall reinforcement system.

The Science Behind a Stronger Bond

To understand why the Grid Stitch is superior, it’s important to first understand how epoxy bonds to concrete. Epoxy doesn’t just “stick” to concrete—it chemically bonds with it, forming a connection that resembles a weld. For example, the Xtreme 4000 Epoxy included in our Grid Stitch kits has a pull-off strength of around 5,000 pounds. By comparison, unreinforced concrete can fail with just a few hundred pounds of tension.

The Problem With Traditional Staples

Most crack repair staples on the market rely on flat carbon fiber designs with small mechanical ends that get embedded into the concrete. These designs create a weak point by concentrating all the stress at the ends of the staple. Even worse, flat carbon fiber is difficult to fully saturate with epoxy, which can lead to poor adhesion and delamination over time. When that happens, the only thing holding the stitch in place is those tiny ends—by far the weakest part of the system.

What Makes Grid Stitch Different

The Grid Stitch overcomes these weaknesses with two major advantages:

Factory Pre-Cured with Epoxy
Each Grid Stitch comes pre-saturated and cured in our facility, eliminating the risk of incomplete epoxy coverage in the field.
Open Grid Design for Superior Bonding
The unique mesh design allows epoxy to flow through the stitch during installation. This forms epoxy rivets across the entire surface area—creating a continuous mechanical bond from end to end.

This design doesn’t just sound good—it’s been tested and proven to outperform traditional carbon fiber staples, time and again.

Patented Innovation, Proven Performance

Our breakthrough earned a U.S. patent and continues to lead the industry in strength, reliability, and ease of installation. If you’re still relying on outdated flat stitches or staple-style repairs, it’s time to rethink your approach.