The Simpson 4 x 4 Black Composite-Plastic Standoff Post Base is a load-rated standoff base engineered by Simpson for use with nominal 4x4 posts or columns in both indoor and outdoor settings. Built from engineered composite plastic, it attaches to the bottom of a solid wood column and anchors to concrete using threaded rod and epoxy, keeping the base of the post elevated with a code-required 1-in. standoff that helps protect wood from ground-contact moisture and debris.

Key Features

• Designed for nominal 4x4 posts or columns - ensures a precise, secure fit for standard 4x4 structural members used in decks, porches, and other post-and-column applications.
• Provides the code-required 1-in. standoff - keeps the base of the post elevated above the concrete surface, reducing exposure to moisture and helping meet building code requirements.
• Engineered composite plastic construction - resists the moisture, rot, and corrosion concerns associated with metal or untreated wood bases, making it well-suited for both interior and exterior use.
• Black finish - delivers a clean, finished appearance that blends with post and column bases for a custom, polished look on visible installations.

Why This Product

• Built for indoor and outdoor versatility - the composite-plastic material holds up in exposed outdoor environments as well as interior applications, giving contractors and homeowners a single solution across project types.
• Load-rated for structural confidence - as a load-rated standoff base, it is engineered to handle the demands of real structural post and column applications, not just decorative use.
• Moisture protection by design - by holding the wood post 1 in. above the concrete, this standoff base helps extend the life of the column by minimizing direct contact with water, pooling, and surface debris.
• Straightforward concrete attachment - the base connects to concrete via threaded rod and epoxy, a reliable anchoring method that provides a stable, long-term connection for solid wood columns.

Specifications

• MPN: CPS4-R
• Material: Composite Plastic
• Finish: Composite Plastic
• Nominal Post Size: 4x4
• Standoff Height: 1 in.
• Fasteners Required: (4) 0.148-in. x 3-in. nails and (1) 5/8-in. diameter anchor bolt (sold separately)
• Length: 3-1/4 in.
• Width: 3-1/4 in.
• Height: 1 in.
• Country of Origin: United States

Frequently Asked Questions

What size post or column is the CPS4-R designed for?

The CPS4-R is designed for use with a nominal 4x4 post or column.

What standoff height does the CPS4-R provide?

The CPS4-R provides the code-required 1-inch standoff between the base of the post or column and the concrete surface.

What fasteners are required to install the CPS4-R?

Installation requires (4) 0.148-in. x 3-in. nails and (1) 5/8-in. diameter anchor bolt. The standoff base attaches to the bottom of the solid wood column and to concrete using threaded rod and epoxy.

Can the CPS4-R be used outdoors?

Yes. The CPS4-R is a composite-plastic standoff base designed for use both indoors and outdoors.

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