The Simpson 12 x 12 Black Composite-Plastic Standoff Post Base is an engineered composite-plastic standoff base from Simpson designed for use with nominal 12x12 solid wood columns and posts in both indoor and outdoor applications. The base attaches to the bottom of the column and anchors to concrete using threaded rod and epoxy, delivering the code-required 1-in. separation between wood and concrete that helps protect structural columns from ground-contact moisture while satisfying building code requirements. Its load-rated construction and clean black finish make it a practical and polished solution for residential and commercial column installations alike.

Key Features

• Fits nominal 12x12 posts and columns - sized precisely for standard 12x12 lumber so the base integrates cleanly without shimming or modification.
• Provides the code-required 1-in. standoff - creates mandatory separation between the wood column and the concrete surface, helping meet building code requirements and reducing moisture-related wood damage.
• Engineered composite plastic construction - resists the corrosion and degradation that can affect metal bases in outdoor or high-humidity environments, supporting long-term performance.
• Black finish - delivers a finished, custom appearance that suits decorative column applications where hardware visibility matters.
• Rated for indoor and outdoor use - suitable for a wide range of residential and commercial column base applications without needing a separate product for covered or exposed installations.

Why This Product

• Code compliance built in - the 1-in. standoff height directly addresses code requirements for wood-to-concrete column connections, reducing guesswork during inspection and approval.
• Composite plastic resists the elements - unlike steel post bases that can corrode over time, the engineered composite plastic material holds up in outdoor and moisture-prone environments without rusting or staining the surrounding concrete.
• Concrete-anchored connection for structural confidence - the base is load rated and anchors to concrete with threaded rod and epoxy, giving builders and homeowners a structurally sound column base rather than a purely decorative cap.
• Versatile fit across project types - equally suited for indoor architectural columns and outdoor porch or portico posts, making it a single solution for contractors and DIYers working across multiple application types.

Specifications

• MPN: CPS12
• Nominal Post Size: 12x12
• Material: Composite Plastic
• Finish: Composite Plastic (Black)
• Standoff Height: 1 in.
• Installation Fasteners: (4) 0.148-in. x 3-in. nails and (1) 5/8-in. diameter anchor bolt (sold separately)
• Length: 11 in.
• Width: 11 in.
• Height: 1 in.
• Country of Origin: United States

Approved Applications

• Solid wood column and post bases in residential and commercial construction
• Indoor and outdoor column installations requiring a concrete anchor connection
• Applications requiring a code-compliant 1-inch standoff between wood and concrete

Frequently Asked Questions

What post or column size is the CPS12 designed to fit?

The CPS12 is designed for use with a nominal 12x12 post or column.

Can the CPS12 be used outdoors?

Yes. The CPS12 is a composite-plastic standoff base designed for use both indoors and outdoors.

What fasteners are required to install the CPS12?

Installation requires (4) 0.148-in. x 3-in. nails and (1) 5/8-in. diameter anchor bolt to secure the standoff to the post and to concrete.

Why is a standoff base important for wood columns?

The CPS12 provides the code-required 1-in. standoff, creating separation between the wood column and the concrete surface to help protect the wood from moisture and meet building code requirements.

Note: Product dimensions and/or screw or bolt holes may differ from picture.