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CB Column Base

The CB is designed to connect posts to concrete foundations for a wide range of lumber, glulam, and engineered wood product sizes. This column base is either cast-in-place or wet set into the concrete where the bottom of the base plate sits flush with the concrete for full post bearing. The CB is ideal for columns that require high structural values and rugged performance.

Key Features

  • Increased uplift resistance for wind or seismic loading
  • Bolt hole locations meet code-required spacing for optimal capacity


  • Strap: CB4x, CB5x, CB6x — 7 gauge; CB7x and larger — 3 gauge
  • Base: CB4x through CB9x — 7 gauge; CB10x — 3 gauge


  • CB44, CB46, CB48, CB66, CB68, CB610 — galvanized; all other CB — Simpson Strong-Tie gray paint or HDG. Some products available in HDG, stainless steel or black powder coat. (Note: When ordering powder coat, model number is CBxxPC.)


  • Some CBs are available in rough sizes; add the suffix ‘R’ to the standard model number.
  • Other sizes available for CB; specify W1 and W2 dimensions. Consult Simpson Strong-Tie for bolt sizes and allowable loads.

Related Literature

Load Tables

    These products are available with additional corrosion protection. Additional products on this page may also be available with this option, check with Simpson Strong-Tie for details.

    For stainless-steel fasteners, see Fastener Types and Sizes Specified for Simpson Strong-Tie Connectors.

CB Column Base Load Table
  1. Uplift loads may not be increased for duration of load.
  2. Concrete shall have a minimum compressive strength of f'c = 2,500 psi.
  3. Multiply seismic and wind ASD uplift and lateral load values by 1.43 or 1.67, respectively, to obtain LRFD capacities.
  4. In accordance with IBC, Section 1613.1, detached one- and two-family dwellings in Seismic Design Category (SDC) C may use "Wind and SDC A&B" allowable loads.
  5. Downloads shall be reduced where limited by capacity of the post.
  6. Designer is responsible for concrete design.
  7. All references to bolts are for structural quality through bolts (not lag screws or carriage bolts) equal to or better than ASTM A307, Grade A.
  8. Tabulated allowable download is based on capacity determined from following compression-parallel-to-grain stress (Fcll) for wood post: 1,650 psi for glulam, 1,350 psi for 4"-wide sawn lumber, and 1,000 psi for 5"-wide or wider sawn lumber, as applicable.

Code Reports & Compliance