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EPS Post Base


The EPS4Z provides a light-duty connector for attachment of posts to concrete.


  • 14 gauge


  • ZMAX® coating; see Corrosion Information


  • Use all specified fasteners; see General Notes.
  • 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 up to the embedment line. A 2" minimum side cover is required to obtain the full load.
  • Posts shall be preservative-treated wood to meet building code requirements.

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.

Typical EPS4Z Installation
  1. Loads may not be increased for short-term loading.
  2. Concrete shall have a minimum compressive strength, f'c = 2500 psi.
  3. Multiply Seismic and Wind ASD load values by 1.4 or 1.6 respectively to obtain LRFD capacities.
  4. 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.
  5. Download shall be reduced where limited by the design capacity of the post. See Post Capacities for common post allowable loads.
  6. For lateral loads: F1 allowable = 575 lbs. and F2 allowable = 680 lbs.
  7. Designer is responsible for concrete design.
  8. 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.
  9. NAILS: 10dx1 1/2= 0.148" dia. x 1 1/2" long. See other nail sizes and information.

Code Reports

Part IAPMO UES ER ICC-ES ESR City of Los Angeles State of Florida
EPS4Z ESR-3050 RR25985 FL10860


Part Orthographic Perspective
EPS4Z Front View
EPS4Z Left View
EPS4Z Right View
EPS4Z Top View
EPS4Z Perspective View