Simpson Strong-Tie Multiple Joist Connector

Simplified Load Transfer Between Double I-Joists and Metal Web Joists

The Simpson Strong-Tie MJC (Multiple Joist Connector) is a modern, efficient solution for joining two I-joists or metal web joists together to transfer incoming loads from one ply to another. As a direct replacement for traditional filler block details, the MJC eliminates the time, uncertainty, and inspection issues associated with conventional methods, offering a faster, safer, and visibly verifiable alternative.

Key Features

• Universal Fit
  A single size fits all joist combinations—regardless of height or width, making specification and stockholding simpler.

• Improved Safety & Performance
  Provides a reliable mechanical connection between loaded and unloaded joist plies, ensuring effective load sharing.

• Installation Visibility
  Unlike filler blocks, MJCs remain fully visible after installation, improving inspection accuracy and compliance checks.

• Fast, Simple Fixing
  Requires just one nail size (3.75 × 30 mm square twist) for ease and speed of installation.

Material

• Pre-Galvanised Mild Steel
  Offers corrosion protection and long-term durability for indoor or sheltered construction applications.

Product Details

Images

Applications

• Double I-Joist Connections

• Metal Web Joist Splicing

• Load Distribution in Multi-Ply Joists

• Suitable for:

  • Floor joist reinforcements

  • Roof trimmer joists

  • Engineered timber joist systems

Benefits

• Time-Saving Design
  No need to cut and fit filler blocks—reduces labour costs and installation time.

• Safer Load Transfer
  Ensures structural continuity by enabling joined joists to act as a single composite unit.

• Simplified Inspection
  Visual confirmation of MJC installation supports faster sign-off during site assessments.

• One Product for All Sizes
  Removes the guesswork from sizing and speeds up procurement.

Important Note

• Always use 3.75 × 30 mm square twist nails as specified to ensure optimal load capacity.

• Ensure proper placement across the joist connection to maintain structural performance.