The Simpson DTT1Z-KT Deck Tension Tie Kit from Simpson Strong-Tie delivers a complete, code-compliant hardware solution for securing a deck ledger connection to a home - without requiring access to interior floor joists. Engineered from 14-gauge steel with a ZMAX galvanized finish for superior corrosion resistance in exterior and treated-wood environments, these versatile connectors are stronger and safer than nails, lag screws, or bolts, making them an ideal choice for both new deck construction and retrofitting an existing deck to current code standards.

Key Features

• Provides secure deck attachments without requiring access to interior floor joists
• Fastens to the narrow or wide face of a single 2x member for versatile installation
• Ties the guardrail post into deck framing
• Stronger and safer than nails, lag screws or bolts
• Ties the deck into the house for a stronger, safer ledger connection
• Helps prevent a common type of deck failure
• Made from 14-gauge steel with ZMAX galvanization for added corrosion resistance in exterior and treated-wood applications
• Also load rated as a holdown for light-duty shearwalls and braced wall panel applications
• Safe, cost-effective connector designed to meet or exceed code requirements for deck construction
• Made in the United States

Specifications

• MPN: DTT1Z-KT
• Brand: Simpson Strong-Tie
• Coating / Finish: ZMAX
• Gauge: 14
• Member Size: Single or double 2x
• Depth: 1-1/2 in.
• Height: 7-1/8 in.
• Seat Depth: 1-7/16 in.
• Centerline: 3/4 in.
• Screw Offset: 3/16 in.
• Country of Origin: United States

Approved Applications

• Lateral load deck-to-house ledger connection for new deck construction
• Retrofitting an existing deck to current code standards
• Tying guardrail posts into deck framing
• Light-duty shearwall holdown applications
• Braced wall panel applications

What's Included

Each kit contains (4) DTT1Z connectors, (4) Strong-Drive SDWH Timber-Hex HDG screws (SDWH27800G), and (26) #9 x 1-1/2 in. Strong-Drive SD Connector screws - providing a complete hardware solution for one code-compliant deck installation.

Downloads and Resources

• See Load Tables & SPECS : Specifications

Frequently Asked Questions

Do I need to open up interior walls or floors to install the DTT1Z deck tension tie?

No. The DTT1Z is specifically designed to provide secure deck attachments without requiring access to interior floor joists, making it a less invasive approach for both new installations and retrofits.

What fasteners are compatible with the DTT1Z, and are they included in this kit?

The DTT1Z fastens to the narrow or wide face of a single 2x with Simpson Strong-Tie Strong-Drive SD Connector screws (SD9112) or nails, and accepts a 3/8 in. machine bolt, anchor bolt, or lag screw (washer required). It can also be installed with the Strong-Drive SDWH Timber-Hex HDG screw (SDWH27800G) with an integral washer. This kit includes (4) Strong-Drive SDWH Timber-Hex HDG screws (SDWH27800G) and (26) #9 x 1-1/2 in. Strong-Drive SD Connector screws, so no additional hardware purchases are required for a standard installation.

Why is ZMAX galvanization important for deck tension ties?

ZMAX galvanization provides added corrosion resistance specifically suited for exterior and treated-wood applications. Because deck framing is constantly exposed to moisture and pressure-treated lumber, ZMAX coating helps ensure the connector maintains its structural integrity over time in these demanding environments.

Can the DTT1Z be used for applications other than deck construction?

Yes. In addition to serving as a deck tension tie, the DTT1Z connectors are also load rated as a holdown for light-duty shearwall and braced wall panel applications, offering versatility beyond standard deck ledger connections.