The Simpson MIU3.56/18 Face-Mount I-Joist Hanger from Simpson Strong-Tie is built for commercial and high-load engineered wood applications where a dependable, no-compromise connection is critical. Designed specifically for 3-1/2 in. x 18 in. I-joist members, this face-mount hanger delivers strong, load-bearing support underneath the joist without requiring web stiffeners - simplifying installation on demanding structural projects. Formed from 16-gauge steel with a G90 zinc galvanized finish, it is a durable solution for framing professionals who need consistent performance in tough conditions.

Key Features

• Positive-angle nailing geometry - minimizes splitting of the I-joist flanges during fastening while allowing nailing from a more accessible angle, saving time on the job site without sacrificing connection integrity
• No web stiffeners required - the MIU series is engineered specifically for high-load I-joist applications that skip this extra step, reducing material needs and speeding up installation
• 16-gauge steel construction - provides the structural rigidity and load capacity needed for commercial framing and other demanding applications
• G90 zinc galvanized coating - offers enhanced corrosion resistance, making this hanger appropriate for environments where moisture exposure is a concern
• Cannot be modified - the hanger must be used as manufactured, ensuring the rated structural performance is maintained and eliminating guesswork on the job site

Why This Product

• Purpose-built for high-load I-joist framing - unlike general-purpose joist hangers, the MIU series is specifically designed for commercial and high-load I-joist applications, giving structural framers a connector matched to the real demands of engineered wood construction
• Faster installation without added hardware - by eliminating the need for web stiffeners and incorporating positive-angle nailing, this face-mount hanger reduces extra steps and awkward fastening positions, helping crews work more efficiently
• Corrosion-resistant finish for lasting performance - the G90 zinc galvanized coating goes beyond basic protection, making this hanger a reliable long-term choice in framing environments where durability matters
• Consistent, unaltered performance - because the hanger cannot be field-modified, every installation delivers the same engineered connection quality, reducing liability risk and keeping inspections straightforward

Specifications

• MPN: MIU3.56/18
• Member Size: 3-1/2 in. x 18 in.
• Width: 3-9/16 in.
• Height: 17-5/16 in.
• Seat Depth: 2-1/2 in.
• Gauge: 16
• Coating/Finish: Zinc Galvanized, G90
• Hanger Type: Face-Mount
• Install With: 0.162 in. x 3-1/2 in. nails in the face and 0.148 in. x 1-1/2 in. nails in the header (sold separately)
• Country of Origin: United States

Frequently Asked Questions

What size joist is the Simpson MIU3.56/18 designed to support?

The MIU3.56/18 is designed for an actual joist size of 3-1/2 in. x 18 in., making it suitable for standard engineered wood I-joist members of that dimension.

What fasteners should be used to install the MIU3.56/18?

Install with 0.162 in. x 3-1/2 in. nails in the face and 0.148 in. x 1-1/2 in. nails in the header. Always use all specified fasteners and verify that the header can accept the required fasteners.

Does the MIU3.56/18 require web stiffeners?

No. The MIU series hangers are specifically designed for commercial and high-load I-joist applications without requiring web stiffeners, simplifying installation in demanding structural applications.

Can the MIU3.56/18 hanger be modified on the job site?

No. These hangers cannot be modified. Any alteration to the hanger is not permitted, and the connector must be used as manufactured to maintain its rated performance.

Note: Product dimensions may differ from picture. Please see the item description above for specifications.