Floor Joist Stiffening Strap System - Reduce Floor Bounce and Deflection

Engineered solutions for bouncy, sagging, or underperforming floors

Even when floor joists are structurally intact, they may feel weak, springy, or uncomfortable under normal use. Undersized joists, long spans, added loads, or aging construction can lead to excessive deflection—resulting in floors that bounce, sag, or move noticeably under load.

The products in this collection are designed to increase the stiffness of existing floor joists, improving floor performance and comfort without invasive structural modifications.

How These Systems Solve the Problem

Floor Joist Stiffening Strap Systems attach directly to the underside of existing wood joists, forming a continuous steel tension element that resists bending and flexing. By reinforcing the joist in tension, overall stiffness is increased and deflection is reduced—often dramatically.

This approach provides an effective alternative to traditional methods such as sistering joists or adding beams, which may be impractical due to limited headroom, finished spaces, or access constraints.

When Floor Joist Stiffening Is Appropriate

  • These systems are commonly used when:
  • Floors feel bouncy or springy under normal walking
  • Joists are undersized or over-spanned
  • Additional loads have been added (kitchen islands, heavy furniture, equipment)
  • Existing joists have minor damage, notches, or holes
  • Finished floors or ceilings make demolition undesirable
  • Attic or framing conditions require a low-profile reinforcement solution

Engineered, Permanent Retrofit Solutions

All floor joist stiffening products in this collection are engineer-designed, fabricated from structural-grade steel, and intended for permanent installation when installed as specified. These systems improve structural performance while preserving existing construction and minimizing disruption to the home.

If you are unsure whether floor joist stiffening is appropriate for your situation, our team can help review joist sizes, spans, and conditions to guide you toward the correct solution.