The Simpson Strong-Tie MPAI Masonry Purlin Anchor is engineered to provide a secure, code-approved wood-to-concrete and wood-to-masonry connection for open-web truss and I-joist applications. Specifically designed for open-web truss joint connections to concrete or masonry walls, the MPAI creates a reliable load path that transfers uplift and lateral forces from roof framing into the supporting structure.

Built to accommodate the geometry of open-web trusses and engineered wood framing, the MPAI delivers dependable anchorage in residential, agricultural, and light commercial construction. Its embedded anchor portion engages the masonry or concrete wall, while the strap secures directly to the wood framing at the truss joint. Designed for structural performance and installation efficiency, the MPAI helps ensure stability in demanding framing environments.

Key Features

• Designed for Open-Web Truss & I-Joist Connections: Engineered specifically for truss joint attachment to concrete or masonry walls.
• Code Approved: Recognized for wood-to-concrete and wood-to-masonry applications when installed per manufacturer specifications.
• Continuous Load Path Support: Transfers uplift and lateral forces from roof framing into the foundation or wall system.
• Masonry-Compatible Design: Suitable for installation in both concrete and masonry wall assemblies.
• Structural Performance: Manufactured and tested to meet performance requirements for purlin anchorage applications.
• Field-Adjustable Installation: Strap configuration allows positioning to align with truss joint locations.

Applications

• Open-web roof truss connections to concrete walls
• I-joist anchorage to masonry or concrete walls
• Post-frame and hybrid framing systems
• Agricultural buildings and pole barns
• Light commercial construction
• Structures requiring code-recognized uplift resistance at truss-to-wall connections

Installation

The MPAI Masonry Purlin Anchor is installed by embedding the anchor leg into concrete or grouted masonry at the specified depth. Once the concrete or masonry has cured, the strap portion is fastened to the open-web truss or I-joist at the designated joint location using the required nails or approved fasteners.

Proper embedment depth, fastener type, and fastener quantity must follow Simpson Strong-Tie installation guidelines and applicable building code requirements. Ensure correct alignment with the truss joint and verify corrosion protection requirements based on project conditions. Refer to current technical data and evaluation reports for allowable loads and detailed installation specifications.

NOTE: The correct fasteners installed in the correct position must be used to achieve published load values

California Residents: WARNING