The Simpson LMA4Z 2x4 / 3x4 Mudsill Anchor from Simpson is a one-piece sill plate anchor designed as a practical alternative to traditional anchor bolts when securing framing to stemwall or slab foundations. The anchor mounts directly on forms before the concrete pour, eliminating the frustration of misplaced bolts that can throw off wall framing alignment. Its ZMAX galvanized finish provides extra corrosion resistance, making it a reliable choice for exterior construction and applications involving treated lumber.

Key Features

• Economical replacement for 1/2-in. sill plate anchor bolts - delivers a cost-effective anchoring solution without sacrificing holding strength or code-acceptable performance
• Compatible with nominal 2x4 or 3x4 sill sizes - fits the most common framing dimensions used in residential stemwall and slab foundation construction
• 18-gauge steel construction - provides a sturdy, consistent profile that holds its shape during form-mounting and concrete placement
• ZMAX galvanization - offers extra corrosion resistance compared to standard galvanized finishes, making it well-suited for exterior and treated-wood applications where moisture and chemical exposure are a concern
• One-piece design - eliminates loose nuts and washers, reducing the chance of lost hardware and simplifying the anchoring process on the job site
• Mounts on forms before the pour - allows precise, planned placement so the anchor position aligns exactly with the framing layout

Why This Product

• Solves the misplaced anchor bolt problem - because the LMA4Z is set on the form before concrete is poured, framers can position it exactly where needed, avoiding the costly rework that comes with bolts cast in the wrong location
• Built-in corrosion protection for demanding conditions - the ZMAX galvanized coating is specifically engineered for exterior environments and contact with treated wood, giving the anchor long-term durability where standard hardware would be more vulnerable to corrosion
• Streamlined installation with no loose hardware - the single-piece construction means no nuts or washers to track down, and fastening is straightforward using standard 0.148 in. x 1 1/2 in. nails in the sides and top
• Versatile foundation compatibility - approved for both stemwall and slab foundations, this mudsill anchor covers the two most common residential foundation types, making it a flexible choice across a range of framing projects

Specifications

• Model Number: LMA4Z
• Gauge: 18
• Member Size: 2x4, 3x4
• Coating: ZMAX
• Finish: ZMAX
• Country of Origin: United States

Approved Applications

• Stemwall foundations
• Slab foundations
• Exterior applications requiring corrosion resistance
• Treated-wood applications

Frequently Asked Questions

How is the Simpson LMA4Z installed?

Install with 0.148 in. x 1-1/2 in. nails in the sides and top. The anchor should be mounted on the forms while the concrete is still wet. Do not attach the mudsill until the concrete has fully cured.

What sill plate sizes is the LMA4Z compatible with?

The LMA4Z is designed for a nominal sill size of 2x4 or 3x4, making it suitable for standard framing applications on both stemwall and slab foundations.

Why choose the LMA4Z over traditional anchor bolts?

The LMA4Z mounts directly on forms before the concrete pour, eliminating the common problem of misplaced anchor bolts interfering with wall framing alignment. Its one-piece design also means there are no nuts or washers to lose during installation.

What makes the ZMAX coating on the LMA4Z beneficial?

ZMAX galvanization provides extra corrosion resistance compared to standard galvanized finishes, making the LMA4Z especially well-suited for exterior applications and use with treated wood where moisture and chemical exposure are concerns.