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PB Post Base

The PB post base provides a connection between a post (or column) for decks, patio covers and other top-supported structures. Available with standard or ZMAX® galvanization, which offers extra corrosion resistance for outdoor or treated-wood applications.


  • 12 gauge


  • 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).
  • Holes are provided for installation with either 0.162" x 3 1/2" nails or 1/2" bolts for PB66 and PB66R; all other models use 0.162" x 3 1/2" nails only. A 2" minimum sidecover is required to obtain the full load.

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.

  1. Loads may not be increased for duration of load.
  2. Concrete shall have a minimum compressive strength, f'c = 2500 psi.
  3. Multiply seismic and wind ASD uplift and lateral load values by 1.43 or 1.67, respectively, to obtain LRF D capacities.
  4. In accordance with IBC Section 1613.1, detached one- and two-family dwellings in Seismic Design Category (SDC) may use “Wind and SDC A&B” allowable loads.
  5. Downloads shall be reduced where limited by capacity of the post.
  6. For lateral loads for all PB models: F1 allowable = 765 lbs. F2 allowable = 1325 lbs.
  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.
  9. 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.
  10. 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.

Code Reports & Compliance