The Simpson MIU3.12/9 Galvanized Face-Mount I-Joist Hanger is built for commercial and high-load engineered wood framing where a dependable, structurally sound joist connection is non-negotiable. Sized precisely for 3 in. x 9-1/2 in. I-joist members, this face-mount hanger delivers reliable support underneath the joist to create a strong connection at the header - all without requiring web stiffeners. Formed from 16-gauge steel and finished with a G90 zinc galvanized coating for enhanced corrosion resistance, the Simpson MIU series is a proven choice for demanding floor and roof framing systems where engineered lumber connections must meet high-load requirements.

Key Features

• Positive-angle nailing geometry - minimizes splitting of the I-joist flanges while allowing nails to be driven from a more efficient angle, reducing installation time on the job site
• No web stiffeners required - simplifies the installation process in commercial and high-load I-joist applications, saving labor and reducing material complexity
• 16-gauge steel construction - provides the structural strength needed for high-load engineered wood joist connections in commercial framing
• G90 zinc galvanized coating - delivers extra corrosion resistance, making this hanger suitable for moisture-exposed framing environments
• Non-modifiable design - ensures the hanger performs exactly as engineered and tested, giving builders confidence in code-compliant connections

Why This Product

• Engineered specifically for commercial I-joist loads - the MIU series is designed to handle high-load I-joist applications that standard hangers may not be rated to address, making it the right fit for demanding structural framing projects
• Faster installation without sacrificing strength - positive-angle nailing lets crews drive fasteners from a better working angle, cutting installation time while still achieving a structurally sound face-mount connection
• Corrosion-resistant finish extends service life - the G90 zinc galvanized coating provides a meaningful layer of protection against corrosion, supporting long-term performance in floor and roof framing assemblies
• Precision-fit sizing eliminates guesswork - matched exactly to a 3 in. x 9-1/2 in. engineered wood member, this hanger installs with confidence knowing the fit and load rating are purpose-built for that specific joist dimension

Specifications

• Manufacturer Part Number (MPN): MIU3.12/9
• Series: MIU
• Member Size (Actual Joist Size): 3 in. x 9-1/2 in.
• Width: 3-1/8 in.
• Height: 9-1/16 in.
• Seat Depth: 2-1/2 in.
• Hanger Type: Face-Mount I-Joist Hanger
• Steel Gauge: 16
• Coating / Finish: Zinc Galvanized, G90
• Material: Steel
• Country of Origin: United States

Installation

Use all specified fasteners to ensure a code-compliant and structurally sound connection. 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. Verify that the header can accept the required fasteners prior to installation. These hangers cannot be modified in the field.

Approved Applications

• Commercial framing applications requiring high-load joist connections
• Engineered wood I-joist installations at 3 in. x 9-1/2 in. member sizes
• High-load I-joist applications where web stiffeners are not desired
• Face-mount structural connections in floor and roof framing systems

Frequently Asked Questions

What size engineered wood member is the MIU3.12/9 designed to fit?

The MIU3.12/9 is precisely sized to accept a 3 in. x 9-1/2 in. engineered wood I-joist member. It is not adjustable or field-modifiable, so it should only be used with members matching that exact dimension.

Does this hanger require web stiffeners during installation?

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

What nails are recommended for installing the MIU3.12/9?

Simpson Strong-Tie specifies installing this hanger 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. Using the correct fasteners is important for achieving the hanger's rated load performance.

What material and finish is the MIU3.12/9 made from?

The MIU3.12/9 is constructed from 16-gauge steel and features a G90 zinc galvanized coating, which provides extra corrosion resistance for long-term durability in structural applications.