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HDU/DTT2Z Holdowns


Installation

View step-by-step installation instructions
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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 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 DTT2Z tension tie is suitable for lighter-duty holdown applications on single or double 2x posts, and installs easily with Strong-Drive SDS screws (included). The DTT2Z has been tested in accordance with the ICC-ES acceptance criteria for Holdowns Attached to Wood Members (AC155) and meets the minimum requirements for many alternate braced wall panels per section R602.10.3.2 of the 2009 IRC (see table R602.10.6, item 1).

For more information on holdown options, contact Simpson Strong-Tie.

HDU Special Features:

Material: See table.

Finish: HDU – Galvanized; DTT2Z – ZMAX® coating; DTT2SS - stainless steel

Installation:

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

top Gallery:
  roll over images below to see larger image
 
 
HDU
U.S. Patents
6,112,495 and 5,979,130
DTT2Z
U.S. Patent 8,555,580
  Vertical HDU Installation
   
Typical HDU Tie Between Floors   Holdown Raised Off Sill Plate   Horizontal HDU Offset Installation
(Plan View)
See footnote 7.

top Load Table:See code report listings below
Additional Corrosion Protection

These products are available with additional corrosion protection. Additional products on this page may also be available with this option, check with Simpson Strong-Tie for details.

Table
  1. Allowable loads have been increased for wind or earthquake load durations with no further increase allowed; reduce where other load durations govern.
  2. The Designer must specify anchor bolt type, length and embedment. See SB and SSTB Anchor Bolts.
  3. Structural composite lumber columns have sides that show either the wide face or the edges of the lumber strands/veneers. Values in the tables reflect installation into the wide face. See technical bulletin T-C-SCLCLM for values on the narrow face (edge).
  4. Post design by Specifier. Tabulated loads are based on a minimum 3 1/2" wide post (in a 3 1/2" wall). Post may consist of multiple members provided they are connected independently of the holdown fasteners. See Post Capacities for common post allowable loads.
  5. Tension values are valid for holdowns flush or raised off of sill plate.
  6. Deflection at Allowable Tension Load includes fastener slip, holdown deformation and anchor rod elongation for holdowns installed up to 6" above top of concrete. Holdowns may be installed raised up to 18" above top of concrete with no load reduction provided that additional elongation of the anchor rod is accounted for.
  7. Tabulated loads may be doubled when the holdowns are installed on opposite sides of the wood member provided either the post is large enough to prevent opposing holdown screw interference or the holdowns are offset to eliminate screw interferences.
  8. Noted HDU14 allowable loads are based on a 5 1/2" wide post (6x6 min.).
  9. Requires heavy hex anchor nut to achieve tabulated loads (supplied with holdown).
  10. Loads are applicable to installation on either narrow or wide face of post
next  top Code Reports (PDFs):
Legacy Reports
  IAPMO UES ER ICC-ES ESR CITY OF LOS ANGELES STATE OF FLORIDA ICC-ES NER ICC-ES ER ICC-ES ES
DTT2Z  ESR-2330 / ESR-2523 * RR25720 FL10441      
DTT2Z-SDS2.5  ESR-2330 / ESR-2523 * RR25720 FL10441      
HDUSee specific model numbers for code listings.
HDU11-SDS2.5  ESR-2330 / ESR-2523 * RR25720 FL10441      
HDU14-SDS2.5  ESR-2330 / ESR-2523 * RR25720 FL10441      
HDU2-SDS2.5  ESR-2330 / ESR-2523 * RR25720 FL10441      
HDU4-SDS2.5  ESR-2330 / ESR-2523 * RR25720 FL10441      
HDU5-SDS2.5  ESR-2330 / ESR-2523 * RR25720 FL10441      
HDU8-SDS2.5  ESR-2330 / ESR-2523 * RR25720 FL10441      

* 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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 ORTHOGRAPHIC
PERSPECTIVE
DTT2Z DTT2Z: DWG | DXF
DTT2Z front view: DWG | DXF
DTT2Z left view: DWG | DXF
DTT2Z right view: DWG | DXF
DTT2Z top view: DWG | DXF
High Wind-Resistant Construction D61: Stemwall/Crawlspace: DWG | DXF
DTT2Z: DWG | DXF
DTT2Z installed: DWG | DXF
HDUNone for this model None for this model
HDU11 HDU11: DWG | DXF
HDU11 front view: DWG | DXF
HDU11 right view: DWG | DXF
HDU11 top view: DWG | DXF
None for this model
HDU14 HDU14: DWG | DXF
HDU14 front view: DWG | DXF
HDU14 left view: DWG | DXF
HDU14 right view: DWG | DXF
HDU14 top view: DWG | DXF
None for this model
HDU2 HDU2: DWG | DXF
HDU2 front view: DWG | DXF
HDU2 right view: DWG | DXF
HDU2 top view: DWG | DXF
High Wind-Resistant Construction D46: Stud to Band Joist: DWG | DXF
High Wind-Resistant Construction D9: Girder/Truss to Wall Framing: DWG | DXF
HDU4 HDU4: DWG | DXF
HDU4 front view: DWG | DXF
HDU4 right view: DWG | DXF
High Wind-Resistant Construction D8: Girder/Truss to Wall Framing: DWG | DXF
HDU5 HDU5: DWG | DXF
HDU5 front view: DWG | DXF
HDU5 right view: DWG | DXF
High Wind-Resistant Construction D101: Holdowns: DWG | DXF
High Wind-Resistant Construction D21: Girder/Truss To Masonry/Concrete: DWG | DXF
High Wind-Resistant Construction D49: Floor to Masonry/Concrete: DWG | DXF
HDU8 HDU8: DWG | DXF
HDU8 front view: DWG | DXF
HDU8 right view: DWG | DXF
None for this model

   
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