CBTZ™ Concealed Beam Tie
Product Details
CBTZ is part of the concealed structural connector line that combines structural strength with invisibility. Designed to connect horizontal beams atop a vertical post, the CBTZ continues the structural load path into the foundation through the CPTZ. The simplistic cylindrical design allows installations with a common drill bit, eliminating challenging kerf cuts. The CBTZ is available in two models designed to connect beams and posts of a variety of sizes. It is part of a concealed connector system that includes the CPTZ and CJT.
Key Features
- Flattened sides assist installer while using the CBTZ as a template
- Locator tabs provide proper dimensional layout
- Required dowel pins included
- Orientation markings distinguish which end installs into the post and which end goes into the beam
Material
- 12 gauge
Finish
- CBT — ZMAX® coating; the 1/2"-diameter drift dowels are mechanically galvanized in accordance with ASTM B695, Class 55
Installation
- Use all specified fasteners; see General Notes
- 1/2" dowels included
- CBT2Z requires a minimum 6"-deep nominal beam
- For step-by-step installation instructions, see technical bulletin CBTZ Concealed Beam Tie Installation Instructions (T-C-CBTZINS) or view our video in the image gallery
Related Literature
Product Information Table
| Model No. | Nominal Post Size | Ga. | H (in.) | D (in.) | Coating/Material | Packaging Qty. |
|---|---|---|---|---|---|---|
| CBT2Z-KT | 4x4 | 12 | 1 1/4 | 10 | ZMAX® | 1 |
| CBT4Z-KT | 6x6 | 12 | 1 1/4 | 14 | ZMAX® | 1 |
Load Tables
These products are available with additional corrosion protection.
- Uplift and lateral loads have been increased for wind or earthquake loading, with no further increase allowed; reduce where other loads govern.
- Lateral load is in the direction parallel to the beam.
- Alternative 1/2"-diameter hex- or square-head machine bolts may be used for loads listed.
- All references to bolts are for structural-quality through bolts (not lag screws or carriage bolts) equal to or better than ASTM A307, Grade A.
- 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.
- See figure for placement of the additional SDS fasteners required for the splice connection.
- Dowels included in CBTZ kits do not match required lengths for the multi-ply application. The sizes shown in the table above need to be ordered separately or trimmed in the field.
- Built-up lumber (multiple members) must be fastened together to act as one to resist the applied load (excluding the connector fasteners). This must be determined by the Designer.
- Center CBTZ on built-up beam. Loads are applicable to beam installation flush to one side of post or beam centered on post.
Code Reports & Compliance
Drawings
| DWG | DXF | RFA | IFC | SAT | |||
|---|---|---|---|---|---|---|---|
