Key Features
Adjusts for I-Joists Extra-long straps can be field-formed for height adjustment, so this hanger fits engineered wood joists from 9-1/4 inches to 14 inches deep without needing a different fixed hanger for every size. 18-Gauge Steel Build The 18-gauge steel body gives the hanger the structure it needs for joist support, while the G90 galvanized finish adds corrosion resistance for typical framing conditions. Cleaner Nailing Path Positive-angle nailing helps reduce the chance of splitting the I-joist bottom flange, which matters when you are working with engineered wood that does not forgive bad fastener placement.
Overview
The Simpson Strong-Tie THAI Galvanized Adjustable Truss Hanger for 3-1/2-in. Engineered Wood (THAI422) is a galvanized adjustable truss hanger built for supporting 3-1/2 inch engineered wood members. This is a truss hanger designed for connecting and supporting I-joists in engineered wood framing. Model Number: THAI422. If you are framing with I-joists and need top-flange hanger convenience with some flexibility in the field, this is the kind of connector that solves a real jobsite problem.
What makes the THAI422 useful is its adjustable design. Instead of being locked into one fixed joist height, the extra-long straps can be field-formed so the hanger works with joist depths from 9-1/4 inches to 14 inches. That gives a crew more room to handle varying engineered wood layouts without switching to a different hanger every time the joist depth changes. The joist width is 3-1/2 inches, and the seat width is 3-9/16 inches, so it is built around that wider engineered wood format.
The fastening layout is not just there for looks. Simpson’s positive-angle nailing, or PAN, is meant to help eliminate splitting at the I-joist’s bottom flange. On engineered wood, that matters. A bad nail path can damage the member or slow the install when you have to correct it. This hanger is designed to make that connection more controlled and more repeatable, especially for framers who install these regularly and want less guesswork.
Material and finish matter on connectors, and the THAI422 keeps it straightforward. It is made from 18-gauge steel with a G90 galvanized finish for added corrosion resistance. That makes it a practical choice for standard wood framing conditions where you want a coated connector, not raw steel. The body is substantial enough for the application, while still being formable in the field where the design expects adjustment.
From an installation standpoint, this hanger is built for engineered wood and structural composite lumber applications. The product information also notes that web stiffeners are required for I-joists used with these hangers, and the strap should be field-formed over the top of the header by a minimum of 2-1/2 inches. Those details are worth knowing up front because they affect whether the hanger is the right fit for your framing plan and how you prep the install.
This is not a general-purpose face-mount joist hanger for every framing situation. It is a specialized connector for I-joist support and truss hanger applications where adjustability is an advantage. Builders, framers, deck crews, and remodelers working with engineered wood will get the most from it. If your job uses 3-1/2 inch engineered wood members and you need a hanger that can adapt to multiple joist depths while keeping the installation secure, the THAI422 earns its place pretty quickly.
See How It Supports Engineered Wood
This hanger is built for real engineered wood framing, not just a catalog drawing. The top-flange format and adjustable strap design let it bridge the gap between clean planning and what actually happens on the job.
- Designed for 3-1/2 inch engineered wood applications
- Supports joist depths from 9-1/4 inches to 14 inches
- Top-flange style keeps the connection above the supporting member
Built to Be Formed in the Field
The long straps are the whole point here. They give you the ability to fit multiple joist depths with one hanger style, which helps when engineered wood layouts vary from one area of the build to another.
- Made from 18-gauge steel
- G90 galvanized finish adds corrosion resistance
- Seat width is 3-9/16 inches for the intended member size
What’s in the Box
- (1) Adjustable I-Joist Truss Hanger
Key Specifications
| Material | 18-gauge steel |
|---|---|
| Finish | G90 galvanized |
| Joist Width | 3-1/2 in. |
| Joist Depth Range | 9-1/4 in. to 14 in. |
| Seat Width | 3-9/16 in. |
| Height | 21-7/8 in. |
| Weight | 1.5 lb |
| UPC | 044315358302 |
Built For
Construction General Contracting Carpentry Framing Engineered Wood Construction I-Joist Support Truss Hanger Applications Remodeling
Pro Tip
On this THAI422, plan for web stiffeners on the I-joist before you start hanging joists. Also make sure you field-form the strap over the top of the header by at least 2-1/2 inches, because that detail is part of how this adjustable hanger is meant to work.
Tool Nut’s Take
Tool Nut’s Take
Simpson Strong-Tie THAI422 Galvanized Adjustable Truss Hanger That Actually Gives You Some Jobsite Flex
If you frame with engineered wood, this hanger makes sense because it covers a useful depth range and is built around the realities of I-joist installation.
- Who it’s for: Framers, builders, and remodelers working with 3-1/2 inch engineered wood and I-joist layouts.
- Why it stands out: The adjustable strap design, positive-angle nailing, and galvanized 18-gauge construction make it more than just another fixed connector.
- Worth knowing: This is a specific engineered wood hanger, not a one-size-fits-all joist hanger, so pay attention to the required joist width, depth range, and web stiffener requirement.
Common Questions
- What material size is this hanger made for? It is designed for 3-1/2 inch engineered wood members.
- What joist depths does it fit? The listed joist depth range is 9-1/4 inches to 14 inches.
- Is this hanger corrosion resistant? Yes. It has a G90 galvanized finish for extra corrosion resistance.
- Does installation require any additional framing detail? Yes. The provided installation overview states that web stiffeners are required for all I-joists used with these hangers.
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