DTT Deck Post Connector
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 lbs. lateral load connection to the house at four locations per deck. This new 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 connector is available individually or in a kit of 4 along with 4 Strong-Drive® SDWH Timber-Hex HDG screws and 24 Strong-Drive® SD Connector screws.
The new 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 new Strong-Drive SDWH Timber-Hex HDG screw with an integral washer. 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 ½" machine bolt or anchor bolt.
The DTT2 can be used to satisfy the IRC provision for a 1,500 lbs. 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 2½" Strong-Drive SDS Heavy-Duty Connector screws (model DTT2Z-SDS2.5) to achieve higher loads when needed.
DTT1Z/DTT2Z—ZMAX® coating; DTT2SS—Stainless steel. See Corrosion Information.
- Use all specified fasteners. See General Notes.
- A standard cut washer (refer to General Notes) 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.
- Strong-Drive SD Connector screws install with a 1/4" hex head driver.
- Strong-Drive SDWH Timber-Hex HDG screws install with a 1/2" hex head driver.
- For Shearwall Installation, see HDU/DTT.
Deck Connection and Fastening GuideF-DECKCODE13This guide provides a range of info that makes it user-friendly for DIY and novice contractors while retaining a level of detail for more experienced builders.Flier
Critical Deck ConnectionsS-DECKCONTP12A color tearpad targeting DIY’ers as an educational reference guide for safe deck construction. The piece outlines the vital components of a deck constructed with a continuous load path in mind.Flier
Barrier Membranes & Preservative-Treated WoodT-PTBARRIER08-RThis technical bulletin describes the added corrosion resistance that may be obtained by using Grace Vycor® Deck Protector™ between connectors and preservative-treated woods.Technical Bulletin
Building Roof-to-Wall Continuous Load Path ConnectionsT-HTIECONPATH10This technical bulletin discusses the optimum way to build roof-to-wall continuous load path connections and avoid eccentric loading.Technical Bulletin
Connection Solutions for Cantilevered FloorsT-CNTLVRDFLR10This technical bulletin provides connection solutions to create a continuous load path within the cantilevered floor system. Offers options based on floor systems being used.Technical Bulletin
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Strengthening Dwellings in Tornado-Prone AreasT-C-TORNADO15Gain insight into how to strengthen structures to resist damage in tornado-prone areas using Simpson Strong-Tie connectors and continuous-load-path design principles.Technical Bulletin
Panelized Roof SystemsT-C-PRS15Learn about the guidelines for designing and installing our connectors to meet the requirements of the 2009 IBC for structures using panelized wood roof systems with concrete or masonry walls.Technical Bulletin
Companion for the 2001 AF&PA Wood-Frame Construction Manual for Wind DesignT-01WFCM08The T-01WFCM08 is a 24-page technical bulletin designed to be used in conjunction with the 2001 edition of the Wood Frame Construction Manual.Technical Bulletin
DIY Done Right - Facilitamos los proyectos para su casaS-HOMPRJCTS14SPFlier
Conectores Metálicos Estructurales 2013-2015C-2013SPInformación completa de productos, de la aplicación, de las tablas de cargas y de la instalación, para conectores Simpson Strong-Tie® de madera a madera, madera a concreto y concreto a mampostería.Catalog
Installation Options for Deck Lateral Load ConnectionsT-C-DECKLAT15Learn how Simpson Strong-Tie can help you meet the IRC requirement for a lateral-load connection between a deck and the adjacent structure.Technical Bulletin
City of Los Angeles RR Values for Connectors in Shear Walls and Wall Anchorage AssembliesT-C-HDLA15T-C-HDLA15 is a technical bulletin that details holdown requirements imposed by the City of Los Angeles and provides adjusted load values for Simpson Strong-Tie holdowns that meet these requirements.Technical Bulletin
Installer's Pocket GuideS-C-INSTALL16S-C-INSTALL16 is a guide featuring updated products, new color illustrations and easier navigation. Some popular structural fastening and anchoring products have also been added.Installation Guide
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Flood-Resistant Construction Guide for Flood-Prone RegionsF-C-FLOODCON13This flier is designed to educate Specifiers, Building Officials, and Dealers about how to build code-compliant structures to resist the forces created by flooding and high wind.Flier
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- The allowable loads have been increased 60% 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