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CBS Column Base

The CBS is designed to be the interface between columns and their foundations. The main function of this column base is to link the column to the concrete footing surface and thereby transmit the structure’s stresses to the foundation. The 1" standoff of the CBS meets code requirements for structural posts installed in basements or exposed to weather or water splash.

Key Features

  • Installs with bolts and provides tested capacity
  • 1″ standoff for areas potentially exposed to water
  • Bolt-hole locations that meet code requirements in wood posts


  • See table


  • Galvanized; available in HDG


  • Use all specified fasteners; see General Notes
  • Install with two machine bolts
  • Install CBS with bottom of standoff flush to top of concrete
  • Post bases do not provide adequate resistance to prevent members from rotating about the base and therefore are not recommended for non-top-supported installations (such as fences or unbraced carports)

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.

CBS Column Bases Load Table
  1. Loads may not be increased for duration of load.
  2. For higher downloads, pack grout solid under 1" standoff plate before installation. Base download on column or concrete, according to the code.
  3. Concrete shall have a minimum compressive strength of f'c = 2,500 psi.
  4. Multiply Seismic and Wind ASD uplift and lateral load values by 1.43 or 1.67, respectively, to obtain LRFD capacities.
  5. 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.
  6. Downloads shall be reduced where limited by capacity of the post.
  7. Designer is responsible for concrete design.
  8. Structural composite lumber columns have sides that show either the wide face or the edges of the lumber strands/veneers known as the narrow face. Values in the tables reflect installation into the wide face. See technical bulletin T-C-SCLCLM for load reductions resulting from narrow-face installations.

Code Reports & Compliance