DTT Deck Tension Tie
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DTT tension ties are safe, cost-effective connectors designed to meet or exceed code requirements for deck construction. These versatile DTT connectors are also load-rated as a holdown for light-duty shearwalls and braced-wall panel applications.
For new construction or to make an existing current deck code-compliant, the DTT1Z can be used as a tension-tie to satisfy the 2015 IRC provision for a 750 lb. lateral load connection to the house at four locations per deck. This code detail permits the lateral connection from the deck joists to be made to top plates, studs or headers within the supporting structure, which eliminates the need to access to the floor joists inside the home. The DTT1Z is available in a kit (DTT1Z-KT) that includes (4) DTT1Z connectors, (4) Strong-Drive® SDWH Timber-Hex HDG screws and (26) SD #9 x 1 1/2" screws.
The DTT1Z fastens to the narrow or wide face of a single 2x with Simpson Strong-Tie® Strong-Drive SD Connector screws or nails and accepts a 3/8" machine bolt, anchor bolt or lag screw (washer required) or can be installed with the Strong-Drive SDWH Timber-Hex HDG screw with an integral washer.
The DTT2 can be used to satisfy the IRC provision for a 1,500 lb. lateral load connection at two locations per deck. Additionally, the DTT2 has been tested and evaluated in deck guardrail post applications to resist the code-specified lateral forces at the top of railing assemblies. The DTT2 is also available with longer 2 1/2" Strong-Drive SDS Heavy-Duty Connector screws (model DTT2Z-SDS2.5) to achieve higher loads when needed. The DTT2 fastens easily to the wide face of a single or double 2x using Simpson Strong-Tie Strong-Drive SDS Heavy-Duty Connector screws (included) and accepts a 1/2"-diameter machine bolt or anchor bolt.
For guard post installations using Strong-Drive SDWS Timber screws, see Guard Post Installations Using Strong-Drive SDWS TIMBER Screws (T-F-SDWSGRD).
- 14 gauge
- DTT1Z/DTT2Z — ZMAX® coating; DTT2SS — stainless steel. See Corrosion Information.
- Use all specified fasteners; see General Notes
- A standard cut washer (included for DTT2) must be installed between the nut and the seat
- Simpson Strong-Tie Strong-Drive SDS Heavy-Duty Connector screws install best with a low-speed high-torque drill with a 3/8" hex-head driver (Model DB6H1.75)
- Strong-Drive SD Connector screws install with a 1/4" hex-head driver (Model DBHEX)
- Strong-Drive SDWH Timber-Hex HDG screws install with a 3/8" hex-head driver (Model DB6H1.75)
- Wood Construction Connectors Technical and Installation Notes
- General Notes
- Corrosion Information
- Corrosion-Resistant Products
- Strong-Drive® SD Connector Screw
- Strong-Drive® SDS Heavy-Duty Connector Screw
- Strong-Drive® SDWH Timber-Hex HDG Screw
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These models are approved for installation with the Strong-Drive® SD Connector screw. See the load values below.
- Allowable loads have been increased for wind or earthquake loading with no further increase allowed.
- DTT1Z installations with allowable loads below 750 lbs. do not satisfy the 2015 IRC requirements for deck-to-house lateral load connections.
- The Strong-Drive® SDWH Timber-Hex HDG screw with a minimum of 3" of thread penetration into dry lumber has an allowable withdrawal load (160) of 1380 lbs. into SP, 1225 lbs. into DF and 1020 lbs. into SPF/HF.
- Load values are valid if the product is flush with the end of the framing member or installed away from the end.
- The guardrail post illustration above addresses an outward force on the guardrail. An additional DTT2Z can be added at the lower bolt to address an inward force.
- A 3/8" HDG round washer is required when using a lag screw.
|Part||IAPMO UES ER||ICC-ES ESR||City of Los Angeles||State of Florida|
|DTT2SS||No code listing. Please contact us for test data.|
ESR-2523 is an Index of many of Simpson Strong-Tie Stamped and Welded Cold-formed Steel Products for Wood or Cold-formed Steel Construction
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