The Simpson Adjustable I-Joist Truss Hanger is engineered specifically for 1-3/4 in. I-joists and LVL members, delivering reliable load support underneath the joist with the added convenience of a top-flange hanger design. Extra-long straps can be field-formed over the top of the header, giving installers on-site height adjustability without requiring a custom-ordered component. Built from 18-gauge steel with a G90 galvanized finish, this hanger is a dependable choice for engineered wood framing applications where a strong, lasting connection is essential.

Key Features

• Positive-angle nailing (PAN) - directs fasteners at an angle that helps eliminate splitting of the I-joist's bottom flange, protecting the structural integrity of the member during and after installation
• Extra-long field-formable straps - can be bent over the top of the header on the jobsite to provide height adjustability, reducing the need for pre-planned sizing and simplifying rough framing
• Compatible with a broad joist depth range - accommodates I-joists and LVL members across a wide span of depths, making this a versatile hanger for varied engineered wood framing situations
• 18-gauge steel construction - provides a sturdy, rigid seat that maintains load-carrying capacity throughout the life of the structure
• G90 galvanized finish - delivers extra corrosion resistance compared to lighter coatings, extending service life in environments where moisture exposure is a concern
• Web stiffeners required for all I-joist use - ensures the connection is installed to the full structural standard the hanger is rated for, maintaining load performance at the joint

Why This Product

• Field adjustability built in from the start - the extra-long strap design lets installers form the hanger to the correct height on-site, accommodating real-world framing conditions without special fabrication or callbacks
• Engineered specifically for I-joists and LVL - the positive-angle nailing feature and seat dimensions are purpose-built for 1-3/4 in. engineered wood members, reducing the risk of bottom-flange splitting that can occur with hangers designed for dimensional lumber
• Maximum load capacity is achievable in the field - by using the full fastener schedule specified for the straps, installers can reach the hanger's highest rated load-carrying capacity without any shop fabrication
• Corrosion resistance backed by a recognized coating standard - the G90 galvanized finish meets a well-established industry benchmark for zinc coating weight, giving builders confidence in long-term performance in demanding framing environments

Specifications

• MPN: THAI1.81/22
• Brand: Simpson Strong-Tie
• Member Size: 1-3/4 I-joist, 1-3/4 LVL
• Joist Width: 1-3/4 in.
• Joist Depth: 9-1/4 in. to 14 in.
• Seat Width: 1-13/16 in.
• Gauge: 18
• Coating/Finish: Zinc Galvanized, G90
• Install With: (6-20) 0.148 in. x 3 in. nails in the header and (2) 0.148 in. x 1-1/2 in. nails in the joist
• Country of Origin: United States

Options

• Contact us for Configurable Options and Special orders

Frequently Asked Questions

What size I-joist or engineered wood member is this hanger designed for?

The THAI1.81/22 is designed for 1-3/4 in. I-joists and 1-3/4 in. LVL (laminated veneer lumber) members, with a compatible joist depth range of 9-1/4 in. to 14 in.

What fasteners are required for installation?

Installation requires (6-20) 0.148 in. x 3 in. nails in the header and (2) 0.148 in. x 1-1/2 in. nails in the joist. Use all specified fasteners and verify that the header can accept the fasteners specified. When a total of 20 face nails are used in the THAI straps, maximum load-carrying capacity is achieved.

Is this hanger adjustable, and how is the height adjustment achieved?

Yes. The THAI1.81/22 features extra-long straps that can be field-formed over the top of the header to provide height adjustability. For top nailing installations, the strap must be field-formed over the top of the header by a minimum of 2-1/2 in.

Does this hanger require web stiffeners, and how does it help protect I-joist flanges?

Web stiffeners are required for all I-joists used with this hanger. Additionally, the positive-angle nailing (PAN) design helps eliminate splitting of the I-joist's bottom flange during installation, protecting the structural integrity of the engineered wood member.

Note: Product dimensions may differ from picture.