The Simpson DTT1Z ZMAX Galvanized Deck Tension Tie by Simpson is a safe, cost-effective connector engineered to meet or exceed code requirements for deck construction. Whether you are attaching a new deck to an existing home or retrofitting an older deck to current code standards, this tension tie delivers a less invasive solution that eliminates the need to access interior floor joists. Load rated as a holdown for light-duty shearwall and braced wall panel applications as well, the DTT1Z is a versatile connector built for demanding exterior conditions.

Key Features

• No interior floor joist access required - simplifies both new deck construction and retrofit projects, reducing disruption to the home's interior.
• Fastens to the narrow or wide face of a single nominal 2x member - gives installers flexible placement options to suit a variety of framing conditions.
• Ties the guardrail post into deck framing - creates a more secure railing connection that helps meet modern safety and code requirements.
• Stronger and safer than nails, lag screws, or bolts alone - delivers superior tension resistance for a more structurally sound deck attachment.
• Ties the deck into the house for a stronger ledger connection - directly addresses one of the most common points of deck failure for added peace of mind.
• Helps prevent a common type of deck failure - engineered to resist the tension forces that cause decks to pull away from the structure over time.
• 14-gauge steel with ZMAX galvanization - provides enhanced corrosion resistance suited for exterior environments and pressure-treated wood applications.

Why This Product

• Code-ready performance without invasive installation - the DTT1Z is designed to meet or exceed deck construction code requirements while allowing attachment from the exterior, making it practical for both new builds and existing deck upgrades.
• Dual-purpose connector for greater value - in addition to deck ledger and guardrail post connections, this tie is load rated as a holdown for light-duty shearwall and braced wall panel applications, covering more use cases with a single product.
• Built for long-term performance in harsh conditions - the combination of 14-gauge steel construction and ZMAX galvanized coating makes this connector well suited for the moisture and chemical exposure common in exterior and treated-lumber applications.
• Targets a leading cause of deck failure - by securing the tension connection between the deck and the house structure, the DTT1Z directly reduces the risk of deck separation, a critical safety concern in residential construction.

Specifications

• MPN: DTT1Z
• Brand: Simpson Strong-Tie
• Gauge: 14
• Coating: ZMAX
• Finish: ZMAX
• 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
• Install With: Fastens to the narrow or wide face of a single nominal 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) or can be installed with the Strong-Drive SDWH Timber-Hex HDG screw (SDWH27800G) with an integral washer

Approved Applications

• New deck attachment to an existing home
• Retrofitting an existing deck to current code standards
• Guardrail post connections tied into deck framing
• Ledger connections tying the deck into the house structure
• Light-duty shearwall holdown applications
• Braced wall panel applications

Downloads and Resources

• Model No. DTT1ZGa. 14W (in.) 1 1/2H (in.) 7 1/8B (in.) 1 7/16CL (in.) 3/4SO (in.) 3/16Coating/Material. ZMAXSee Load Tables & SPECS : Specifications

Frequently Asked Questions

Does the DTT1Z require access to interior floor joists for installation?

No. The DTT1Z is specifically designed to provide secure deck attachments without requiring access to interior floor joists, making it ideal for both new construction and retrofitting existing decks.

What fasteners are compatible with the DTT1Z deck tension tie?

The DTT1Z fastens to the narrow or wide face of a single nominal 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.

What type of corrosion resistance does the DTT1Z offer?

The DTT1Z is made from 14-gauge steel with ZMAX galvanization, providing added corrosion resistance specifically suited for exterior and treated-wood applications.

Can the DTT1Z be used for applications beyond deck construction?

Yes. In addition to deck construction, the DTT1Z is load rated as a holdown for light-duty shearwalls and braced wall panel applications, making it a versatile connector for a range of structural uses.

Related Products

• DTT1Z Deck Tension Tie Kit)