PBS Post Base
On This Page
The PBS is designed to provide a secure connection between a post (or column) and concrete in projects including decks, patio covers and other top-supported structures. These post bases are elevated 1" to avoid contact of the wood post with standing water to help prevent rot at the post end. For extra corrosion resistance, these cast-in-place post bases are available with ZMAX® galvanization.
- Provides a 1" standoff between post and concrete that meets code requirements
- Available with standard or ZMAX® galvanization, which offers extra corrosion resistance for outdoor or treated-wood applications
- Embeds in wet concrete before the concrete has cured and is designed to install flush with the concrete surface
- Embossment in the vertical straps provides increased strength
- Optional fastening with either nails or bolts
- See table
- Galvanized. Some products available in ZMAX® or HDG coating. See Corrosion Information.
- Use all specified fasteners; see General Notes.
- Install either nails or bolts.
- 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).
- Embed into wet concrete, ensuring complete consolidation, up to the bottom of the 1" standoff base plate. A 2" minimum side cover is required to obtain the full load. Holes in the bottom of the straps allow for free concrete flow.
Many of these products are approved for installation with Strong-Drive® SD Connector screws.
- 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.
- Multiply seismic and wind ASD uplift and lateral load values by 1.43 or 1.67, respectively, to obtain LRF D 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.
- Post bases do not provide adequate resistance to prevent members from rotating about the base and therefore are not recommended for installations that lack top support (such as fences or unbraced carports).
- Downloads shall be reduced where limited by capacity of the post.
- Designer is responsible for concrete design.
- For lateral loads for all PBS models: F1 allowable = 1,165 lb. when using nails and 230 lb. when using bolts. F2 allowable = 835 lb. when using either nails or bolts.
- 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.
- Fasteners: Nail dimensions in the table are listed diameter by length. For additional information, see Fastener Types and Sizes Specified for Simpson Strong-Tie Connectors.
|ModelNo.||Nominal Post Size||Fasteners||Allowable Loads|
|Post Flange||Base Bottom||Uplift||Lateral F1||Lateral F2||Download|
Code Reports & Compliance