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DTT2Z Deck Post Connectors

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The DTT2Z is a safe, cost-effective way to attach deck-railing posts to the deck framing. Because the post is tied back into the deck joists, rather than to the rim joist alone, the connection is stronger than typical through-bolt installations and complies with IRC and IBC code requirements regarding handrail and guardrail post connections for decks. The DTT2Z also complies with the new IRC requirements for laterally tying the deck to the house. Additionally, the versatile DTT2Z is load rated as a holdown for light-duty shearwalls and braced wall panel applications. The DTT2Z fastens easily to a single 2x joist or stud using Simpson Strong-Tie® Strong-Drive® SDS screws (included) and accepts a 1/2" machine bolt or anchor bolt.

Solutions for Decks

The DTT2 is ideal for two critical deck connections:

Guardrail-Post Connection

  • Ties the guardrail post into deck framing
  • Stronger and safer than nails, lag screws or bolts
  • Meets provisions set in the International Residential Code® (IRC) for guardrail reinforcement (Table R301.5)
  • Single post-to-deck connection tested for the concentrated load specified in ICC-ES acceptance criteria for Handrails and Guards (AC273)

Lateral-Load Connection

  • Ties the deck into the house for a stronger, safer ledger connection
  • Helps prevent a common type of deck failure
  • Meets provisions set by the 2009 International Residential Code® (IRC) for lateral deck-to-house connections (R502.2.2.3)

The new DTT2SS is made from stainless steel for applications in higher exposure environments. Whether it's a deck guardrail post application or the lateral-load connection from the deck to the adjacent structure, the new stainless-steel DTT2SS is the best choice for seaside applications or those calling for more corrosive preservative-treated lumber formulations. It fastens to the framing members with stainless-steel Simpson Strong-Tie Strong-Drive SDS wood screws (included).

The new DTT2Z-SDS2.5 is our standard DTT2Z packaged with 2 1/2" Simpson Strong-Tie Strong-Drive SDS wood screws instead of the standard 1 1/2" fasteners. These longer screws allow the DTT2Z to achieve a load capacity in excess of 2100 lbs. when used as a holdown on double studs in a shearwall application. The DTT2Z-SDS2.5 is also suitable in deck applications when double 2x members are used for deck joists or blocking.

Solutions for Shearwalls

See HDU/DTT2 for more information.

Material: DTT2Z/DTT2SS—14 gauge

Finish: DTT2Z—ZMAX® coating; DTT2SS—Stainless steel; see Corrosion Information.


For Shearwall Installation, see HDU/DTT2.

top Gallery:
  roll over images below to see larger image
(DTT2SS similar)
DTT2Z installed as a lateral connector for a deck guardrail post.

For more information on guardrail post connections, see technical bulletin

Typical Deck-to-House Lateral Load Connection

For more information on lateral load connections, see technical bulletin T-DECKLATLOAD.


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.

  1. The allowable loads have been increased 60% for wind or earthquake loading with no further increase allowed.
  2. Load values are valid if the product is flush with the end of the framing member or installed away from the end.
  3. 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.

next  top Code Reports (PDFs):
Legacy Reports
DTT2SS No code listing. Please contact us for test data.
DTT2Z  ESR-2330 / ESR-2523 * RR25720 FL10441      
DTT2Z-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

next  topDrawings: To download drawings, right-click or Ctrl-click on the link, then choose "Save Target As..."
Download the Simpson Strong-Tie® AutoCAD® Menu, which allows you to insert Ortho views directly into your AutoCAD drawing.

DTT2None for this model None for this model
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 installed: DWG | DXF

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