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CPTZ Concealed Post Tie

CPTZ

Retrofit Post Bases

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The CPTZ concealed post base provides a clean, concealed look while providing a 1" standoff height above concrete. The 1" standoff reduces the potential for decay at the post end and satisfies code requirements for posts that are exposed to weather, water splash or in basements.

  • The CPTZ is tested and load-rated for uplift, download and lateral load.
  • Simpson Strong-Tie saves installers time by providing all the necessary components to make the connection in one box.
  • The CPTZ anchorage can either be cast-in-place or retrofitted with adhesive or mechanical anchors.
  • Solutions have been calculated per ACI 318, Appendix D to determine their allowable load in different concrete configurations.

Material

See table below

Finish

  • Knife plate, washers and standoff base are ZMAX®-galvanized steel. The standoff base has an additional textured, flat black powder coat finish for aesthetic purposes. The 1/2" diameter drift dowels are mechanically galvanized in accordance with ASTM B695, class 55. If substituting 1/2" diameter machine bolts, a hot-dip galvanized finish is recommended.
  • See Corrosion Information.

Installation

  • 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-braced, or non-top-supported installations.

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.

CPT44Z (others similar)
  1. Uplift loads have been increased for wind or earthquake load with no further increase allowed; reduce where other loads govern.
  2. Downloads may not be increased for short-term loading and shall not exceed the post capacity. See Post Capacities for common post capacities.
  3. CPTZs are supplied with (3) 1/2" diameter dowel pins. Alternate 1/2" diameter hex or square head machine bolts may be used for loads listed.
  4. Lag or carriage bolts are not permitted.
  5. Structural composite lumber columns have sides that show either the wide face or the edges of the lumber strands/veneers. Values in the tables reflect dowel or bolt installation into the wide face.

CPTZ Anchorage Using SET-XP® Anchoring Adhesive

  1. Allowable uplift loads are calculated per ACI 318-11, Appendix D considering cracked and uncracked concrete and are qualified for Wind and Seismic Design Categories A & B. No further increases allowed.
  2. Edge distance is measured from the center line of the nearest anchor bolt to the edge of concrete.
  3. Foundation dimensions are for anchorage only. Foundation design by others. Refer to ACI318-11.
  4. Lateral loads (F1 = F2) for Corner – Flush Edge conditions are CPT44Z = 395 lbs., CPT66Z = 570 lbs., CPT88Z = 740 lbs. For all other installations using CPTZ with SET-XP® anchoring adhesive, use the allowable loads from the CPTZ table above.
  5. Concrete shall have a minimum compressive strength, f'c = 2500 psi.

CPTZ Cast-in-Place Anchorage

  1. Allowable uplift loads are calculated per ACI 318-11, Appendix D considering cracked and uncracked concrete and are qualified for Wind and Seismic Design Categories A & B. No further increases allowed.
  2. Edge distance is considered to be measured from the center line of the nearest anchor bolt to the edge of concrete.
  3. Tabulated anchor embedments will also achieve the maximum lateral loads from the CPTZ table above.
  4. Foundation dimensions are for anchorage only. Foundation design by others. Refer to ACI318-11.

Code Reports

Part IAPMO UES ER ICC-ES ESR City of Los Angeles State of Florida
CPT44Z ESR-1622 RR25712 FL10860
CPT66Z ESR-1622 RR25712 FL10860
CPT88Z ESR-1622 RR25712 FL10860
CPTZSee specific model numbers for code listings.

Drawings

Part Orthographic Perspective
CPT44Z
CPT44Z front view
DWG DXF
CPT44Z left view
DWG DXF
CPT44Z right view
DWG DXF
CPT44Z top view
DWG DXF
CPT44Z
DWG DXF
High Wind-Resistant Construction D89: Post/Column to Foundation: Typical CPT44Z Corner-Flush Edge Installation (CPT66Z and CPT88Z similar)
DWG DXF
CPT66Z
CPT66Z front view
DWG DXF
CPT66Z left view
DWG DXF
CPT66Z right view
DWG DXF
CPT66Z top view
DWG DXF
CPT66Z
DWG DXF
High Wind-Resistant Construction D89: Post/Column to Foundation: Typical CPT44Z Corner-Flush Edge Installation (CPT66Z and CPT88Z similar)
DWG DXF
CPT88Z
CPT88Z front view
DWG DXF
CPT88Z left view
DWG DXF
CPT88Z right view
DWG DXF
CPT88Z top view
DWG DXF
CPT88Z
DWG DXF
High Wind-Resistant Construction D89: Post/Column to Foundation: Typical CPT44Z Corner-Flush Edge Installation (CPT66Z and CPT88Z similar)
DWG DXF
CPTZNone None