The Simpson CB5-6 Column Base from Simpson Strong-Tie is engineered to connect posts to concrete foundations across a wide range of lumber, glulam, and engineered wood product sizes. Designed specifically for a nominal Glulam 5-1/8 in. x 6 in. column, this base is either cast-in-place or wet set into concrete so the bottom of the base plate sits flush with the concrete surface, ensuring full post bearing and maximum load transfer. Built from 7-gauge steel with a Simpson Strong-Tie gray paint finish, the CB5-6 delivers high structural values and rugged performance in demanding structural applications.

Key Features

• Increased uplift resistance for wind or seismic loading - provides critical protection in high-wind and seismic zones, helping the connection meet structural safety requirements where lateral and uplift forces are a concern.
• Bolt hole locations meet code-required spacing for optimal capacity - pre-engineered hole placement simplifies installation and ensures the connection achieves its full rated load capacity without guesswork.
• Cast-in-place or wet-set installation - two installation methods give contractors flexibility on the jobsite, with the base plate sitting flush with the concrete surface to provide full post bearing and efficient load transfer.
• 7-gauge steel construction - heavy-gauge material delivers the rugged durability required for structural column base applications where long-term performance under load is essential.
• Simpson Strong-Tie gray paint finish - factory-applied coating provides a consistent, clean appearance suitable for exposed structural conditions.

Why This Product

• Built for high-demand structural connections - the CB5-6 is specifically designed for columns that require high structural values, making it a dependable choice for glulam post-to-foundation connections where load performance cannot be compromised.
• Engineered for wind and seismic zones - increased uplift resistance and code-compliant bolt hole spacing work together to support applications in regions subject to wind and seismic loading, helping projects meet local building code requirements.
• Flexible concrete installation options - compatibility with both cast-in-place and wet-set methods means this column base adapts to different concrete pour schedules and construction sequencing without requiring specialty hardware.
• American-made heavy-gauge steel - manufactured from 7-gauge steel, this column base is built to withstand the physical demands of structural post support, offering contractors and builders confidence in long-term connection integrity.

Specifications

• Manufacturer Part Number (MPN): CB5-6
• Brand: Simpson Strong-Tie
• Nominal Column Size: Glulam 5-1/8 in. x 6 in.
• Material Gauge: 7-Gauge Steel
• Finish / Coating: Simpson Strong-Tie Gray Paint
• Installation Hardware: (2) 5/8 in. diameter machine bolts (sold separately)
• Width 1: 6 in.
• Width 2: 5-1/4 in.
• Country of Origin: United States

Approved Applications

• Connecting glulam columns to concrete foundations
• Connecting lumber and engineered wood product posts to concrete foundations
• Structural applications requiring high uplift resistance against wind loading
• Structural applications requiring high uplift resistance against seismic loading
• Cast-in-place concrete column base installations
• Wet-set concrete column base installations
• Columns requiring high structural values and rugged performance

What's Included

• 1 x Simpson Strong-Tie CB5-6 Column Base
• Install with: (2) 5/8 in. diameter machine bolts (hardware not included - verify fastener requirements for your application)

• Contact us for Configurable Options and Special orders

Frequently Asked Questions

What column size is the CB5-6 designed to fit?

The CB5-6 is designed for a nominal Glulam 5-1/8 in. x 6 in. column. It is compatible with lumber, glulam, and engineered wood product posts of this size.

How is the CB5-6 installed into concrete?

The CB5-6 is installed by either casting it in place or wet setting it into the concrete so that the bottom of the base plate sits flush with the concrete surface. This flush installation provides full post bearing at the concrete interface for maximum load transfer.

What hardware is required to install the CB5-6?

Installation requires two 5/8 in. diameter machine bolts. The bolt hole locations are designed to meet code-required spacing for optimal load capacity.

What material and finish is the CB5-6 made from?

The CB5-6 is constructed from 7-gauge steel and features a Simpson Strong-Tie gray paint finish, providing heavy-duty structural performance and durability in demanding applications.