CPTZ Concealed Post Tie

Specialty Collection

This product's information may differ depending on the category of use. You are currently viewing details related to Specialty Collection. You can also view product information related to the category: Retrofit Post Bases

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. It is part of a system of concealed connectors that includes the CBTZ and CJT.

• 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.
• Use knife blade portion of CPTZ as a template to mark dowel/bolt locations on post.
• Drill 1/2" diameter holes perpendicular to post at marked locations.
• Cut a 3/16"-wide slot in the end of the post. Cut slot on face adjacent to the one with the holes. If using a circular saw, cut the slot roughly 6 1/2" up the post. Test that the knife blade slides freely in the slot.
• Install the knife blade portion of the connector on the anchor bolts and then place the supplied washers over top of the connector’s tabs and on the anchor bolt. Use nuts to attach the knife blade and washers to the anchors.
• The Designer must specify anchor bolt type, length and embedment.
• Slide the standoff base on to the knife blade assembly.
• Stand the post on the knife blade and drive in the dowels supplied with the connector.
• 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).

Related Links

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

Catalog Pages

• C-C-2017 (Wood Construction Connectors), pages 94–95

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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.

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 318-14 considering cracked and uncracked concrete and are qualified for Wind and Seismic Design Categories A & B. Allowable loads are also applicable to detached one- and two-family dwellings in SDC C per IBC Section 1613. 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 = 2,500 psi.

CPTZ Cast-in-Place Anchorage

1. Allowable uplift loads are calculated per ACI 318-14 considering cracked and uncracked concrete and are qualified for Wind and Seismic Design Categories A & B. Allowable loads are also applicable to detached one- and two-family dwellings in SDC C per IBC Section 1613. 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 ACI318-14.

Code Reports