The Simpson HCP1.81 Hip Corner Plate from Simpson Strong-Tie is engineered specifically for hip roof framing, connecting LVL hip members to double top plates at a 45 deg. angle to deliver reliable resistance to both uplift and download forces. Built to the high manufacturing standards that engineers and contractors trust, this hip corner connector simplifies roof assembly while meeting the structural demands of code-compliant construction.

Key Features

• Connects LVL hip members to double top plates at a 45 deg. angle - purpose-built geometry means accurate positioning at the hip corner without complex field modifications
• Rafter may be sloped to 45 deg. - accommodates common hip roof pitches, giving you flexibility across a wider range of roof designs
• Birdsmouth not required for table uplift loads - simplifies rafter preparation and speeds up installation, though a birdsmouth may still be required for download applications
• Made from 18-gauge steel - provides a solid, durable connection that holds up to the structural loads placed on hip roof corners
• G90 zinc galvanized coating - delivers extra corrosion resistance so the connector performs reliably in exterior roofing environments over the long term
• Straightforward installation sequence - attach to double top plates first, install rafter, then complete nailing for a logical workflow that reduces errors on the job site

Why This Product

• Engineered for the specific demands of hip roof construction - unlike general-purpose framing hardware, this plate is designed exclusively for the hip corner, providing targeted resistance to both uplift and download forces where they matter most
• Trusted by engineers and contractors - Simpson Strong-Tie connectors are the recognized choice among building professionals for projects that must meet structural performance and building code requirements
• Corrosion-resistant finish extends service life - the G90 galvanized coating goes beyond basic protection, making this connector well suited for the exposed conditions typical of roof framing applications
• Simplified installation without sacrificing strength - the ability to skip the birdsmouth for uplift load applications and the clear nailing sequence reduce labor time while maintaining a code-compliant, structurally sound hip roof connection

Specifications

• Model Number: HCP1.81
• Member Size: 1-3/4 in.
• Gauge: 18
• Height: 2 in.
• Coating: Zinc Galvanized, G90
• Finish: Zinc Galvanized, G90
• Install With: (6) 0.148 in. x 1-1/2 in. nails to the rafters and (6) 0.148 in. x 1-1/2 in. nails to the plate
• Country of Origin: United States

Approved Applications

• Hip roof framing connections at the hip corner
• Connecting LVL hip members to double top plates at a 45 deg. angle
• Roof assemblies requiring resistance to uplift and download forces
• Engineered wood (1-3/4 in.) hip member applications

Frequently Asked Questions

What is the purpose of the Simpson HCP1.81 hip corner plate?

The HCP1.81 is designed for use on the hip of a roof. It connects LVL hip members to double top plates at a 45 deg. angle and provides resistance to both uplift and download forces.

Is a birdsmouth cut required when installing the HCP1.81?

A birdsmouth is not required for table uplift loads, but it may be required for download. Always verify your specific load requirements before finalizing the installation method.

How many fasteners are needed to install the HCP1.81?

Installation requires (6) 0.148 in. x 1-1/2 in. nails to the rafters and (6) 0.148 in. x 1-1/2 in. nails to the plate, for a total of 12 nails.

What type of corrosion protection does the HCP1.81 have?

The HCP1.81 features a G90 zinc galvanized coating, which provides extra corrosion resistance and is suitable for standard exterior roofing applications.

Related Products

• Nails 0.148" x 1-1/2"

Note: Product dimensions and/or Screw or Bolt holes may differ from picture. Please see item description for specifications.