The Simpson CBST44Z CBST ZMAX Standoff Column Base for 4x4 is a cast-in-place column base engineered by Simpson to create a secure, durable connection between wood posts and concrete foundations in residential and light commercial construction. Built with a code-required 1 in. standoff and heavy-duty ZMAX galvanization, this post base delivers long-lasting structural performance in exterior environments and treated-wood applications where moisture exposure and corrosion are ongoing concerns.

Key Features

• Code-required 1 in. standoff design - elevates the post above the concrete surface to create an air gap, protecting the post end from direct moisture contact and significantly reducing the risk of post-end rot over time
• S-shaped bearing tabs - provide increased connection strength, allowing for higher download loads compared to simpler flat-tab designs and making this base suitable for demanding structural applications
• ZMAX galvanization - delivers extra corrosion resistance beyond standard galvanization, making this column base well suited for exterior use and direct contact with treated lumber where moisture and corrosive preservatives are a concern
• Dual-gauge steel construction (base 12, strap 10) - combines heavier strap steel where uplift and lateral forces concentrate with a solid base plate, giving the assembly the right strength where it matters most
• Installs with (2) 5/8 in. diameter machine bolts - cast-in-place installation anchors the base directly into concrete, creating a rigid, code-compliant post-to-foundation connection without guesswork

Why This Product

• Built-in rot protection from day one - the 1 in. standoff keeps wood post ends off the concrete, addressing one of the most common causes of long-term post failure in outdoor and ground-level structures without any additional accessories
• Engineered for higher loads - the S-shaped bearing tab geometry increases download capacity, making this standoff column base a capable choice for decks, pergolas, carports, and light commercial post connections where structural demands are greater
• Coating matched to the application - ZMAX galvanization is specifically suited for exterior environments and pressure-treated lumber, reducing the corrosion risk that standard coatings can face when in prolonged contact with treated wood preservatives
• American-made quality from a trusted connector brand - produced by Simpson, a name recognized throughout the construction industry for engineered wood connectors, giving builders and inspectors confidence in the product's design and performance claims

Specifications

• Model Number: CBST44Z
• Member Size: 4x4
• Width 1: 3-9/16 in.
• Width 2: 3-1/2 in.
• Depth: 7-1/8 in.
• Height: 8-3/8 in.
• Gauge: Base 12; strap 10
• Coating: ZMAX
• Finish: ZMAX
• Install With: Install with (2) 5/8 in. diameter machine bolts (sold separately)
• Country of Origin: United States

Frequently Asked Questions

Why does the CBST44Z have a 1 in. standoff design?

The code-required 1 in. standoff elevates the wood post above the concrete surface, creating an air gap that protects the post end from direct moisture contact and significantly reduces the risk of post-end rot over time.

What is ZMAX galvanization and why does it matter?

ZMAX is a thicker zinc coating applied to the steel that provides extra corrosion resistance compared to standard galvanization. This makes the CBST44Z especially well suited for exterior applications and use with treated lumber, where exposure to moisture and corrosive preservatives is a concern.

What hardware is required to install the CBST44Z?

Install with (2) 5/8 in. diameter machine bolts. These bolts anchor the base into the concrete during the cast-in-place installation process.

What do the S-shaped bearing tabs do?

The S-shaped bearing tabs are a structural feature that provides increased strength to the connection, allowing the CBST44Z to handle higher download loads compared to simpler flat-tab designs, making it suitable for demanding residential and light commercial construction applications.

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