PPBZ Porch Post Base


The PPBZ porch base offers a simplified, one-time installation designed to support permanent porch framing throughout all stages of construction. This design eliminates the need for temporary vertical support and streamlines the subcontractor scheduling process while still providing adequate safety to enable full access for installers/inspectors.

The porch post base is fastened to the footing with two Simpson Strong-Tie® Titen® masonry screws when framing the porch roof. Then, when the time is right, the concrete contractor is able to complete the last phase of the porch slab without the interference of temporary vertical support and without the framer having to return to the jobsite after the slab has hardened. Designed to withstand vertical construction loads prior to embedment in concrete, the PPBZ will support the weight of most framed porches and overhangs.


  • Stiffened embedded side stirrups provide temporary vertical download support without being embedded into concrete
  • 1″ stand-off reduces the potential for decay at post or column ends
  • Two available sizes provide both 4″ and 6″ slab thicknesses
  • Pre-pour installation eliminates temporary support
  • No disruption in scheduling
  • Eliminates additional move-ins by trades and certain inspection call backs

Material: See table

Finish: ZMAX® coating


  • Use all specified fasteners. See General Notes.
  • Locate and place PPBZ on footing according to framing plans
  • Secure PPBZ to footing with 2 – (1⁄4″ dia. x 1 1⁄4″ long hex head) Titen® concrete screws located a minimum of 1 1⁄2″ from the edge of concrete.
  • Attach 4×4 post to PPBZ using 12-10d common (0.148″ dia. x 3″ long) nails. After bracing the top and bottom of the post from lateral movement, the post may then be loaded in download or uplift.
  • When ready, pour concrete porch slab (4″ or 6″) up to the bottom of the stand-off base while maintaining minimum 1″ concrete side coverage.
  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 pages 245-246 for common post allowable loads.
  6. Designer is responsible for concrete design.
  7. For full loads, nearest concrete edge required is 4″ from PPBZ center line.
  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: 10d = 0.148″ dia. x 3″ long. See other nail sizes and information.
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