Product Description
The Simpson Concealed Post Base for 6x6 Posts by Simpson combines a knife plate design with a standoff base to deliver a clean, concealed look wherever structural posts meet concrete. The 1 in. standoff height keeps post ends elevated above the concrete surface, satisfying code requirements for permanent structures exposed to weather or water splash, and the ZMAX galvanized finish provides extra corrosion resistance for exterior and treated-wood applications. Installation is straightforward using 1/2 in. anchor bolts and the supplied 1/2 in. diameter galvanized drift dowels, with anchorage options that work for both new pours and existing concrete.
Key Features
- Knife plate with standoff base - achieves a concealed, finished appearance at the post-to-concrete connection, keeping hardware out of sight for a cleaner result
- 1 in. standoff height - meets code requirements for permanent structures exposed to weather or water splash, or in basements, while reducing the potential for decay at post or column ends
- Cast-in-place or retrofit anchorage - compatible with adhesive or mechanical anchors, giving contractors flexibility for both new construction and existing concrete slabs or footings
- ZMAX galvanized coating - delivers extra corrosion resistance beyond standard galvanization, making this post base well suited for exterior installations and use with pressure-treated lumber
- 12 ga. base and 10 ga. knife plate construction - heavier knife plate gauge provides the strength needed at the critical post-to-hardware interface
Why This Product
- Concealed design for professional results - the knife plate slides inside the post rather than wrapping around the exterior, so the structural connection stays hidden and the finished installation looks intentional and clean
- Built-in decay protection - the 1 in. standoff keeps the post end off the concrete surface, limiting moisture contact at a spot that is especially vulnerable to rot over time
- Versatile installation without extra hardware - anchorage can be cast in place or added to existing concrete with adhesive or mechanical anchors, and the required drift dowels are supplied, so the base arrives ready to install
- ZMAX finish for long-term durability in tough conditions - the extra corrosion protection makes this post base a reliable choice for decks, covered porches, pergolas, and other outdoor structures where the hardware will be exposed to moisture or in contact with treated wood
Specifications
- MPN: CPT66Z
- Brand: Simpson Strong-Tie
- Nominal/Rough Post Size: 6x6
- Gauge: Base 12 ga.; knife plate 10 ga.
- Coating: ZMAX
- Finish: ZMAX
- Installation Hardware: Install with 1/2 in. anchor bolts and supplied dowels
- Width: 5-3/8 in.
- Length: 5-3/8 in.
- Country of Origin: United States
What's Included
Each pack contains CPT66Z concealed post base, 1/2 in. diameter galvanized pins (supplied).
Downloads and Resources
Frequently Asked Questions
- Why is the 1 in. standoff height important?
- The 1 in. standoff height is code-required when supporting permanent structures that are exposed to weather or water splash, or in basements. It also reduces the potential for decay at post or column ends by keeping the post end elevated above the concrete surface.
- What anchorage methods are compatible with the CPT66Z?
- The anchorage for the CPTZ can be either cast-in-place or retrofit with adhesive or mechanical anchors, providing flexibility for both new construction and existing concrete installations.
- Why is ZMAX galvanization used on this post base?
- ZMAX galvanization offers extra corrosion resistance, making the CPT66Z suitable for exterior applications and use with treated wood, where standard galvanized finishes may be insufficient over time.
- What fasteners are required to install the CPT66Z?
- The CPT66Z is installed with 1/2 in. anchor bolts and the supplied 1/2 in. diameter galvanized drift dowels, which are included with the post base.
Related Products
Note: Product dimensions and/or Screw or Bolt holes may differ from picture.
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