About StrongHold

You’re Stronger Than You Think!

StrongHold™ is the residential division of HJ3 Composite Technologies, LLC. StrongHold™ brings HJ3’s patented carbon fiber right to to your home, providing the same industrial strength that we use to repair bridges, tanks, and buildings in an easy do-it-yourself kit. From bowed and cracked walls and floors to crawl spaces, countertops, and so much more, we’re on a mission to save homeowners like you 60-90% on your residential repairs!

HJ3, a Technology Transfer company from the University of Arizona, is independently owned and based in Tucson, Arizona. We won 3 National Titles in the 2013 CleanTech Open, including the Peoples’ Choice award, and have received national recognition from CNN, Fox Business, and the Discovery Channel. With 25 years of large-scale testing behind our products, and more than 100 published white papers, you can rest assured that HJ3 really is The Strongest Name in Carbon Fiber™.

Join the other 10,000 happy homeowners who have relied on StrongHold™ to repair their homes! StrongHold gives YOU the power to do it yourself…because You’re Stronger than You Think!

StrongHold™ currently provides solutions for these problems:

  • Bowed Walls
  • Cracked Walls
  • Cracked Floors
  • Cracked Driveways and Patios
  • Cracked Corners
  • Leaking Pipes
  • Cracked Concrete Countertops


Don’t want to do it yourself? You don’t have to! We’ll connect you with a local certified installer!