The CBS column base installs with machine bolts and provides tested capacity. The 1" standoff (included) meets code requirements for structural posts installed in basements or exposed to weather or water splash. The CBSQ uses Simpson Strong-Tie® Strong-Drive® SDS Heavy-Duty Connector screws, which allow for fast installation, reduced reveal and high capacity, and provide a greater net section area of the column compared to bolts.
Galvanized; available in HDG
Use all specified fasteners; see General Notes.
For CBS, install with two machine bolts.
For CBSQ, install 1/4" x 2" Strong-Drive SDS Heavy-Duty Connector screws, which are provided with the column base. (Lag screws will not achieve the same load.)
For full loads, a minimum of 3" side cover shall be provided.
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).
To order the CBSQ with screws, specify CBSQ-SDS2. To order without screws, specify CBSQ.
For higher downloads, solid pack grout under 1" standoff plate before installing CBS or CBSQ into concrete. Base download on column or concrete, according to the code.
Concrete shall have a minimum compressive strength, f'c = 2500 psi.
Multiply Seismic and Wind ASD load values by 1.4 or 1.6 respectively to obtain LRFD capacities.
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.
Download shall be reduced where limited by the design capacity of the column. See Post Capacities for common post allowable loads.
Designer is responsible for concrete design.
Structural composite lumber columns have sides that either show 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 due to narrow face installations.