The Simpson CB88HDG column base from Simpson is engineered to connect 8x8 lumber, glulam, and engineered wood posts to concrete foundations with confidence. Designed for either cast-in-place or wet-set installation, the base plate sits flush with the concrete surface to deliver full post bearing beneath the column. The hot-dip galvanized finish makes this connector equally at home in demanding exterior environments and treated-wood applications where long-term durability matters most.

Key Features

• Increased uplift resistance for wind or seismic loading - keeps columns anchored under the lateral and uplift forces that high-wind and seismic events place on a structure, adding a critical margin of safety.
• Bolt hole locations meet code-required spacing for optimal capacity - precise hole placement means you achieve rated load values without field modification, simplifying inspection and approval.
• Cast-in-place or wet-set installation with a flush base plate - the bottom of the base plate sits flush with the concrete surface, providing full post bearing and a clean, professional finish at the column base.
• Heavy-gauge construction - strap 3 ga., base 7 ga. - thicker steel where it counts translates to the high structural values and rugged performance required for demanding column applications.
• Hot-dip galvanization provides extra corrosion resistance - the HDG coating is well suited for exterior environments and direct contact with treated lumber, where moisture and chemical exposure can degrade standard coatings over time.
• Installs with (2) 3/4-in. diameter HDG machine bolts - a defined, straightforward fastener requirement means no guesswork on hardware selection and a consistent, code-compliant connection every time.

Why This Product

• Built for high-load column connections - the CB88HDG is specifically designed for columns that require high structural values, making it a dependable choice for decks, pergolas, carports, and structural framing where an 8x8 post carries significant loads.
• Hot-dip galvanized for lasting exterior performance - unlike standard zinc-plated hardware, the HDG finish provides a heavier protective coating that stands up to the moisture, UV exposure, and preservative chemicals common in outdoor and treated-wood construction.
• Engineered for wind and seismic zones - increased uplift resistance and code-compliant bolt hole spacing make this connector a practical fit for structures in regions with demanding wind or seismic design requirements.
• Versatile compatibility with multiple wood products - suitable for solid lumber, glulam, and engineered wood products, this column base accommodates a wide range of 8x8 post materials without requiring a different connector for each application.

Specifications

• MPN: CB88HDG
• Brand: Simpson Strong-Tie
• Nominal Column Size: 8x8
• Width 1: 7-1/2 in.
• Width 2: 7-1/2 in.
• Coating: Hot-Dip Galvanized
• Finish: Hot-Dip Galvanized
• Steel Gauge: Strap 3 ga.; Base 7 ga.
• Install With: (2) 3/4-in. diameter HDG machine bolts (sold separately)
• Country of Origin: United States

Approved Applications

• Connecting 8x8 posts to concrete foundations
• Cast-in-place concrete installation
• Wet-set installation into concrete
• Lumber, glulam, and engineered wood product column connections
• Exterior applications requiring corrosion resistance
• Treated-wood applications
• Structures in high wind or seismic load zones

Options

• Contact us for Configurable Options and Special orders

Frequently Asked Questions

How is the CB88HDG installed into concrete?

The CB88HDG can be installed either cast-in-place or wet set into the concrete. In both methods, the bottom of the base plate sits flush with the concrete surface to ensure full post bearing beneath the column.

What fasteners are required to install the CB88HDG?

Installation requires (2) 3/4-in. diameter hot-dip galvanized (HDG) machine bolts to secure the column base.

Why is hot-dip galvanization important for this column base?

Hot-dip galvanization (HDG) provides an extra layer of corrosion resistance, making the CB88HDG especially well suited for exterior environments and applications involving treated lumber, where moisture and chemical exposure are concerns.

What wood member sizes are compatible with the CB88HDG?

The CB88HDG is sized for a nominal 8x8 column and is compatible with a wide range of lumber, glulam, and engineered wood products of that nominal dimension.

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