RPBZ Retrofit Post Base

The RPBZ retrofit post base is designed to reinforce existing posts and columns. The single, versatile model will fit on any size post consisting of a double 2x4 or larger. RPBZ can also be used to reinforce new post-base connections, such as braced carports, patio covers, decks and other structures. The RPBZ can be installed with the CPS composite plastic standoff to meet a 1" post standoff code requirement. A single RPBZ can be installed on a post that is flush to a corner, and two RPBZs can be installed at away-from-edge conditions to fortify the post-base connection to resist both wind and seismic forces.

Simpson Strong-Tie^® Strong-Drive^® SDS Heavy-Duty Connector screws install easily and provide excellent holding strength for post-to-flange connections. Additionally, the RPBZ can be purposed as a temporary base fixture for posts when shoring beams. RPBZ comes standard in ZMAX^® finish to meet exposure conditions in many environments. See additional Corrosion Information.

Material

• 12 gauge

Finish

• ZMAX coating; see Corrosion Information

Installation

• Use all specified fasteners; see General Notes.
• Simpson Strong-Tie 1/4" x 1 1/2" Strong-Drive SDS Heavy-Duty Connector and base connection fasteners are not provided with RPBZ. Simpson Strong-Tie CPS series composite post standoff sold separately.
• 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 car ports.

Related Links

• Wood Construction Connectors Technical and Installation Notes
• General Notes
• Corrosion Information
• Corrosion-Resistant Products

Catalog Pages

• C-C-2017 (Wood Construction Connectors), page 91

Related Literature

Wood Construction Connectors Catalog

C-C-2017

Complete product and application information, as well as load tables and installation information, for more than 3,000 wood-to-wood, wood-to-concrete and wood-to-masonry connectors.

Catalog

• 
  Conectores para la construcción en madera 2017–2018

  C-C-2017SP

  Información completa de productos, de la aplicación, de las tablas de cargas y de la instalación, para más de 3,000 conectores de madera a madera, madera a concreto y concreto a mampostería.

  Catalog
• 
  High Wind-Resistant Construction Application Guide

  F-C-HWRCAG16

  The newly updated High Wind-Resistant Construction Application Guide offers new applications, updated loads, as well as more fastening information that is used to resist high-wind.

  Product Guide
• 
  Deck Connection and Fastening Guide

  F-DECKCODE17

  A guide to recognizing deck deficiencies and building safer, stronger, longer-lasting outdoor deck structures.

  Product Guide
• 
  A Complete Connector System for Building Decks

  DIY-DCKPTIOCA17

  A two-sided tearpad for Canada showing the hardware needed for a deck system on one side and the hardware needed for a patio cover system on the other side. Newer product recommendations included.

  Flier
• 
  Un système de connexion complet pour la construction de terrasses

  DIY-DCKPTOCA17F

  Un étui à deux faces pour le Canada présentant le matériel nécessaire pour un système de terrasse et un système d’abri de terrasse. Des recommandations de produits plus récentes sont incluses.

  Flier
• 
  Soft-Story Retrofit Guide

  F-L-SSRG18

  A design guide on soft-story retrofits, including soft-story design codes and requirements, retrofit solutions and design tools.

  Flier
• 
  Installer's Pocket Guide

  S-C-INSTALL16

  S-C-INSTALL16 is a guide featuring updated products, new color illustrations and easier navigation. Some popular structural fastening and anchoring products have also been added.

  Installation Guide
• 
  ZMAX® Post Bases Installed with Type 316 Stainless-Steel Titen HD® Heavy-Duty Screw Anchors

  L-PBTHDSS18

  Simpson Strong-Tie ZMAX-coated post bases (including Outdoor Accents®) may be installed with Type 316 stainless-steel Titen HD screw anchors.

  Engineering Letter
• 
  RPBZ on 5/4" SP Decking

  L-C-RPBZSYP17

  Simpson Strong-Tie® RPBZ Retrofit Post Base Installed on 5/4-inch Southern Pine Decking.

  Engineering Letter
• Show 7 More
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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.

RPBZ Connector-Only Values

RPBZ Corner Installation Post Flush To Edge

RPBZ Anchorage-to-Concrete Values

1. Allowable load for design shall not exceed minimum of Connector Only Value and Anchorage to Concrete Value.
2. Allowable connector loads are based on DF/SP lumber. For SPF/HF, multiply table loads by 0.72.
3. Double 2x4s may be used in lieu of 4x4 post.
4. For installation on 6x or larger members, if four RPBZs are used, allowable loads may be taken to be 1.5 x the tabulated two-part value.
5. For installations into concrete, minimum compressive strength, f'c = 2,500 psi. Designer is responsible for concrete member uplift design.
6. Away From Edge loads require face of wood post to be a minimum of 2 1/2" away from near edge of concrete on all four sides of the post.
7. Allowable anchorage to concrete uplift and shear loads for the 3/8" diameter anchors are calculated per ACI 318-14. Shear loads assume cracked concrete while uplift loads consider both cracked and uncracked concrete values and all are qualified for Wind and Seismic Design Categories A&B.
8. Embedment depth for these post-install anchors must be a minimum 2 3/4" and are for use with SET-XP® or AT-XP® structural anchoring adhesives or Titen HD® screw anchors.
9. Allowable uplift and shear loads for the Titen® masonry screws do not carry a particular “cracked” or “uncracked” designation.
10. Titen masonry screws and Titen HD screw anchors should only be used in interior-dry and non-corrosive environments.
11. Threads on Strong-Drive® SDS Heavy-Duty Connector screws into wood framing must be fully engaged into a structural wood member.

Code Reports