The CBSQ 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 CBSQ uses Strong-Drive® SDS Heavy-Duty Connector screws, which allow for fast installation and reduced reveal, and provide a greater net section area of the column than bolts.
1" standoff (included) of the CBSQ meets code requirements for structural posts installed in basements or exposed to weather or water splash
Included fasteners provide faster installation than bolts
SDS Heavy-Duty Connector screws that provide a greater wood net section area than bolts
Galvanized; some models available in HDG or stainless steel
Use all specified fasteners; see General Notes.
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.)
Install CBSQ 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).
For higher downloads, pack grout solid under 1" standoff plate before installation. Base download on column or concrete, according to the code.
Concrete shall have a minimum compressive strength of f'c = 2,500 psi.
To obtain LRFD values, multiply ASD seismic load values by 1.4 and wind load values by 1.67 (1.6 for 2012 IBC).
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.
Downloads shall be reduced where limited by capacity of the post.
Designer is responsible for concrete design.
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.