HJ3 Composite Technologies

In 1997, StrongHold™ patented the first carbon fiber system to strengthen basement walls. StrongHold to strengthen 25,000 homes, saving homeowners over $100 million. Developed by HJ3 Composite Technologies, StrongHold™ Residential Systems provide the strongest composite products in the market. StrongHold products are lightweight, durable, and the only Residential Systems designed to meet ICC and ACI engineering design codes. Our mission is to support our clients with unwavering customer service, product innovation, and technical expertise.

The CarbonSeal Concrete Repair System meets the tough demands of your concrete applications. Whether it's protecting structures exposed to aggressive environments or strengthening your damaged concrete, our systems save you significant money over traditional repairs or replacement. The CarbonSeal Concrete Repair Systems are designed for multiple applications, including beams, columns, walls, slabs, pedestals, silos, and secondary containment. The CarbonSeal carbon fiber is lightweight, flexible and conforms to any substrate for easy installation.

StrongHold offers carbon fiber floor stitching systems to replace the use of steel dowels to reinforce commercial, light industrial, basement, and garage floors. These systems are inserted into saw cuts with polymer resins and install at 10% of the time of steel dowels, with much less effort. Common applications include repairs of cracked floors prior to installing high end flooring systems or colored concrete floors. StrongHold includes a non-permeation floor coating to conceal the repairs as well as protect floors against impact, moisture, and certain chemicals.