The Simpson STC 18-Gauge Roof Truss Clip is a versatile angle connector from Simpson, originally engineered to align roof trusses with nonbearing walls and deliver consistent, straight corners at framing joints. Formed from 18-gauge steel with a G90 zinc galvanized coating, this clip handles everything from light-duty framing connections to applications where a reliable structural connection is needed - making it a go-to solution for contractors and builders tackling a wide variety of roof framing and wall alignment tasks.

Key Features

• Slotted leg design - allows for flexible installation and adjustability, so installers can fine-tune positioning without starting over
• 1-11/16 in. slot - permits vertical truss chord movement when loads are applied, accommodating natural structural movement and helping maintain connection integrity over time
• Compatible with drywall stop - helps prevent fasteners from tearing through ceiling sheetrock, protecting finished surfaces and reducing callbacks
• 18-gauge steel construction - delivers the structural strength needed for roof truss alignment and general framing connections without adding unnecessary bulk
• G90 zinc galvanized coating - provides a corrosion-resistant finish suited for demanding job-site conditions, extending the service life of the connector
• Not intended for floor applications - by design, this clip avoids the deflection and squeak issues common to floor joist installations, keeping it focused on the applications where it performs best

Why This Product

• Built-in adjustability for faster framing - the slotted leg and flexible installation design let crews align roof trusses and nonbearing walls efficiently, reducing time spent correcting misaligned connections on the job site
• Moves with the structure - the 1-11/16 in. slot is specifically engineered to permit vertical truss chord movement when loads are applied, meaning the connection stays secure even as the roof system experiences real-world stress
• Protects finished ceilings - when used with a drywall stop, the STC helps prevent fasteners from tearing through ceiling sheetrock, a practical detail that matters on projects where interior finishes need to be preserved
• Corrosion-resistant for long-term reliability - the G90 zinc galvanized finish means this connector is built to hold up against moisture and environmental exposure, giving builders confidence in the connection well beyond installation day

Specifications

• Model Number (MPN): STC
• Width: 1-1/4 in.
• Height: 2-3/4 in.
• Depth: 1-7/8 in.
• Gauge: 18
• Coating: Zinc Galvanized, G90
• Finish: Zinc Galvanized, G90
• Installation Fasteners: 8d common nails (sold separately)
• Country of Origin: United States

Approved Applications

• Aligning roof trusses to nonbearing walls
• Providing consistent, straight corners at framing joints
• Light-duty framing connections requiring adjustability
• Structural connections where joint strength and alignment are critical
• Use with drywall stop to help prevent fasteners from tearing through ceiling sheetrock

Frequently Asked Questions

What is the primary purpose of the Simpson STC Roof Truss Clip?

The STC was originally designed to align roof trusses and nonbearing walls. Its versatile angle design also makes it ideal for a wide variety of other framing and structural connection applications where consistent, straight corners and joint strength are needed.

How does the slot in the STC truss clip work?

The slot in one leg of the STC allows for flexible installation and adjustability. Specifically, the 1-11/16 in. slot permits vertical truss chord movement when loads are applied, accommodating natural structural movement without compromising the connection.

Can the Simpson STC be used for floor joist applications?

No. This product is not intended for floor applications due to the frequency of floor joist deflections and the potential for squeaks that can result from that type of movement.

What fasteners should be used to install the STC Roof Truss Clip?

The STC should be installed with 8d common nails. For best results when using the clip near ceiling drywall, install it with a drywall stop to help prevent fasteners from tearing through the ceiling sheetrock.