HDU Holdowns are pre-deflected during the manufacturing process, virtually eliminating deflection under load due to material stretch. They use Simpson Strong-Tie® Strong-Drive® SDS Heavy-Duty Connector screws which install easily, reduce fastener slip and provide a greater net section when compared to bolts.
The HDU series of holdowns are designed to replace previous versions of the product such as PHD's as well as bolted holdowns. The HDU2, 4 and 5 are direct replacements for the PHD2, 5 and 6, respectively.
The DTT tension ties are designed for lighter-duty holdown applications on single 2x posts. The new DTT1Z is installed with nails or Simpson Strong-Tie Strong-Drive SD Connector screws and the DTT2Z installs easily with the Strong-Drive SDS Heavy-Duty Connector screws (included). The DTT1Z holdowns have been tested for use in designed shearwalls and prescriptive braced wall panels as well as prescriptive wood-deck applications (see DTT Deck Tension Ties for deck applications).
For more information on holdown options, contact Simpson Strong-Tie.
- Holdown designs virtually eliminate deflection due to material stretch.
- Uses Strong-Drive SDS Heavy-Duty Connector screws which install easily, reduce fastener slip, and provide a greater net section area of the post compared to bolts.
- Strong-Drive SDS Heavy-Duty Connector screws are supplied with the holdowns to ensure proper fasteners are used.
- No stud bolts to countersink at openings.
HDU – Galvanized; DTT1Z and DTT2Z – ZMAX® coating; DTT2SS – stainless steel
- Use all specified fasteners. See Holdown and Tension Tie General Notes.
- The HDU requires no additional washer, the DTT requires a standard cut washer (included with DTT2Z) be installed between the nut and the seat.
- Strong-Drive SDS Heavy-Duty Connector screws install best with a low speed high torque drill with a 3/8" hex head driver.
- For holdowns, per ASTM test standards, anchor bolt nut should be finger-tight plus 1/3 to 1/2 turn with a hand wrench, with consideration given to possible future wood shrinkage. Care should be taken to not over-torque the nut. Impact wrenches should not be used
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
High Wind-Resistant Construction Application GuideF-C-HWRCAG16The newly updated High Wind-Resistant Construction Application Guide offers new applications, updated loads, as well as more fastening information that is used to resist high-wind.Product Guide
Do Your Decks Meet Code?/Patio Cover SystemDIY-DECKPATIO16A two-sided tearpad showing connections on one side, while the other side shows the connectors and fasteners needed for a patio cover system. Newer product recommendations are included.Flier
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
Get Your Deck Up to Code - New DTT1Z Deck Tension TieF-C-DTT1Z15Product, installation and technical information for the new DTT1Z deck tension tie, a new solution for the lateral load connection between a deck and the adjacent structure.Flier
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
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
Anchoring Solutions for Simpson Strong-Tie® Connectors in Wind and Low-Seismic RegionsT-ANCHORSPEC12A cross-reference to help evaluate the anchorage solution options for Simpson Strong-Tie holdowns, tension ties and post bases. Extensive details included for various foundation types.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
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
Connector Solutions to Meet the Wall-Bracing Requirements of 2009 IRCT-WALLBRACE12This technical bulletin provides info about our products that meet the requirements for constructing braced-wall panels as listed in Section R602.10.2 of the 2009 IRC.Technical Bulletin
Connectors Installed on SCL ColumnsT-C-SCLCLM16A one-page, single-sided technical bulletin discussing the structural properties of the two different surface sides of SCL columns, including the listing of reduction factors.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
Uplift Connectors Truss-to-Wall Tiedowns (Spruce-Pine-Fir)T-C-UPLIFTSPF16A one-page, double-sided technical bulletin providing allowable loads and fastening requirements for when a wood truss is supported by a Spruce-Pine-Fir or Hem Fir double top plate.Technical Bulletin
Connectors Installed on SCL Columns, Limit States DesignT-C-SCLCLMCAN13This technical bulletin for Canadian Limit States discusses the structural properties of the two different surface sides of columns made from structural composite lumber.Technical Bulletin
Code-Compliant Guardrail Post ConnectionsT-GRDRLPST10This technical bulletin explains how the railing connection is a crucial safety consideration for deck connections. Includes info on DTT2Z deck tension tie and HD2AHDG holdown.Technical Bulletin
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
DTT2 Supporting a BeamL-C-DTT2BEAM15DTT2 Tension Tie Supporting a Beam.Engineering Letter
Stainless-Steel HoldownsL-C-SSHD16Simpson Strong-Tie® Stainless-Steel HoldownsEngineering Letter
Holdown Anchors: Slab-on-GradeL-C-HDABSOG15Anchor Bolt Recommendations for Holdowns Used with Slab-On-Grade Foundations.Engineering Letter
Holdown Anchors: StemwallL-C-HDABSTEM15Anchor Bolt Recommendations for Holdowns Used with Stemwall FoundationsEngineering Letter
Max. 42" Guardrail PostL-C-GRDRLPST4216Code-compliant guardrail post connections, supplement to T-GRDRLPST, maximum guardrail height of 42 inches.Engineering Letter
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- See Holdown and Tension Tie General Notes.
- Noted HDU14 allowable loads are based on a 5 1/2" wide post (6x6 min.).
- HDU14 requires heavy hex anchor nut to achieve tabulated loads (supplied with holdown).
- Loads are applicable to installation on either narrow or wide face of post.
|Part||IAPMO UES ER||ICC-ES ESR||City of Los Angeles||State of Florida|
|HDU||See specific model numbers for code listings.|
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