The Simpson 28-5/16 in. ZMAX Galvanized Retrofit Strap Tie by Simpson is a 16-gauge steel repair strap built specifically for wood members where pipes and ducts have been run through top plates or sill plates. With a 1 1/2 in. width sized to fit flush on the narrow face of a 2x member, this retrofit plate strap reinforces cut or compromised framing at wall intersections, ridge tie locations, and anywhere plates or soles have been notched for HVAC or plumbing work. ZMAX galvanization delivers enhanced corrosion protection that stands up to exterior conditions and treated-lumber environments, while the staggered nail pattern keeps installation straightforward and clean.

Key Features

• Repair strap for wood members where pipes and ducts are installed - restores structural integrity at framing locations that have been cut or notched for HVAC and plumbing runs, keeping walls code-compliant after rough-in work.
• Fits on the narrow face of a 2x member - the 1 1/2 in. width aligns perfectly with standard dimensional lumber, so the strap sits flat without shimming or modification.
• Fasten where plates or soles are cut, at wall intersections or as a ridge tie - versatile enough to address multiple connection types in a single product, reducing the need to source different hardware for different repair scenarios.
• Staggered nail pattern - distributes fastener load across the strap and wood member evenly, minimizing splitting risk and maximizing holding strength at each connection point.
• Made from 16-gauge steel - provides heavy-duty rigidity and load capacity suited for structural reinforcement rather than light surface repairs.
• ZMAX galvanization offers extra corrosion resistance for exterior and treated-wood applications - outperforms standard galvanized coatings in moisture-rich and chemically active environments, making this strap a dependable long-term solution wherever ACQ or similar treated lumber is used.
• Meets IBC, IRC, and City of Los Angeles code requirements for HVAC and pipes in walls - gives contractors and inspectors a clear, recognized compliance path without additional engineering sign-off for covered applications.

Why This Product

• Purpose-built for retrofit and repair situations - unlike general-purpose flat straps, this connector is specifically engineered for framing members that have been cut for pipe and duct installations, making it the right tool for code-compliant structural repair after mechanical rough-in.
• ZMAX coating extends service life in demanding environments - the elevated corrosion resistance of ZMAX galvanization makes this strap suitable for exterior framing and treated-wood applications where a standard galvanized connector would degrade prematurely.
• Multi-application versatility reduces jobsite inventory - a single strap model handles cut plates, wall intersections, and ridge tie connections, so one part number covers several common repair scenarios on residential and light commercial projects.
• Backed by Simpson engineering and broad code acceptance - compliance with IBC, IRC, and City of Los Angeles requirements means this retrofit strap tie is ready for inspections across a wide range of jurisdictions without special documentation.

Specifications

• Model Number: RPS28Z
• Gauge: 16
• Width: 1-1/2 in.
• Length: 28-5/16 in.
• Coating: ZMAX
• Finish: ZMAX
• Installation Fasteners: Install with (12 - 16) 0.162 in. x 2-1/2 in. nails (sold separately)
• Country of Origin: United States

Approved Applications

• Reinforcing wood members where pipes and ducts have been installed through top or sill plates
• Fastening where plates or soles are cut
• Wall intersections requiring structural reinforcement
• Ridge tie applications
• Exterior applications requiring enhanced corrosion resistance
• Treated-wood applications where standard galvanization is insufficient
• HVAC and pipe installations in walls per IBC, IRC, and City of Los Angeles code requirements
• Sill plate reinforcement (use RPS18Z, RPS22Z, or RPS28Z 16-gauge ZMAX)

Frequently Asked Questions

What is the purpose of the Simpson RPS28Z retrofit strap tie?

The RPS28Z is a repair strap designed for wood members where pipes and ducts are installed. It reinforces areas where top plates or sill plates have been cut for HVAC or plumbing installations, restoring structural integrity at wall intersections and ridge tie locations.

What type of galvanization does the RPS28Z feature, and why does it matter?

The RPS28Z uses ZMAX galvanization, which provides extra corrosion resistance compared to standard galvanized coatings. This makes it suitable for exterior applications and use with treated lumber, where standard galvanization may degrade over time due to chemical exposure or moisture.

What fasteners are required to install the RPS28Z?

The RPS28Z should be installed with (12 - 16) 0.162 in. x 2-1/2 in. nails. The strap features a staggered nail pattern to help distribute load and prevent fastener interference during installation.

Does the RPS28Z meet building code requirements?

Yes. The RPS28Z meets IBC, IRC, and City of Los Angeles code requirements for HVAC and pipes in walls, making it an approved solution for code-compliant structural repairs in residential and commercial construction.

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