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Simpson DTT2Z Deck Tension Tie Zmax with 1.5" inch Screws


MSRP: $9.99
Price: $6.75
You Save: $3.24 (32 %)
Item Number: DTT2Z
Manufacturer: Simpson Strong-tie
Manufacturer Part No: DTT2Z

Simpson DTT2Z Deck Tension Tie Zmax with 1.5" inch Screws

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.

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 DTT2 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 DTT2 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 DTT2 also complies with the new IRC requirements for laterally tying the deck to the house. Additionally, the versatile DTT2 is load rated as a holdown for light-duty shearwalls and braced wall panel applications. The DTT2 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)
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. Refer to Anchor Designer Software™ for ACI 318 for anchoring solutions.
  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-SCLCOLUMN 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 HDU is installed on opposite sides of the wood member provided either the post is large enough to prevent opposing holdown screw inferference 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).

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