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DTT2 Tension Tie & Holdown

Model: DTT2Z

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Simpson Strong‑Tie offers a wide variety of holdown devices designed and tested to address many applications and load demands. The DTT2 Tension Tie & Holdown is designed for lighter‑duty holdown applications on single or double studs. It can also be utilised in horizontal applications as a tension tie to provide balustrade or similar support. It installs easily with the Strong‑Drive® SDS Heavy‑Duty Connector screws (included). The DTT2 is ideal for retrofit or new construction projects. They provide high-strength, post-pour, concrete-to-steel connections.

The DTT2 is a safe, cost-effective way to attach deck-railing posts to the deck framing for stronger, safer railings. Because the post is tied back into the deck joists, rather than to the boundary joist alone, the connection is stronger than typical through-bolt installations.

Please check the Corrosion Information to see if it is suitable for your application.

Material
  • DTT2Z: Carbon Steel 2mm thick
  • DTT2SS: 316 Stainless Steel 2mm thick
Finish
  • DTT2Z: ZMAX® Galvanised
  • DTT2SS: 316 Stainless Steel
Features & Benefits
  • Stronger and safer than typical through-bolt installations for deck post connections
  • Engineered swages for extra strength and to minimise deflections
  • Suitable for lighter duty holdown applications on single or double studs
  • Ties the guardrail post into deck framing for a stronger, safer connection
  • The DTT2 is ideal for lateral-load connections between the deck and house
  • Helps prevent a common type of deck failure
  • 15mm diameter anchor hole can accommodate Simpson Strong-Tie M12 Titen HD Screw Anchor or any M14 threaded rods
  • Available in 316 Stainless Steel for more corrosive environments such as coastal areas
  • Installs easily with Strong-Drive® SDS screws (included)
Installation
  • Use all specified fasteners
  • The DTT2 requires a standard cut washer be installed between the nut and the seat
Applications
  • Bottom Plate Holdown
  • Deck Framing
  • Deck Post Connection
  • Deck-to-House Lateral Load Connection
  • Vertical Floor Connection
  • Mid Floor Wall Bracing
  • Engineered Wood Products (EWP)
  • Cross-Laminated Timber (CLT) 
 
 
Model No. Table

Model No.

Dimensions (mm)

Fasteners

Minimum Timber Member Size (Depth x Breadth, mm)

Design Tension Capacity (kN)
k1 = 1.0

Strap
Thickness

W

H

B

CL

Anchor Hole Dia (mm)

Post (Nails: No. - Length x Dia., Screws: No. - Dia. x Length, mm)

DTT2Z

DTT2SS

2

85

175

40

21

12

8 – SDS6.4 x 38

90 x 38

7.72

90 x 75

9.04
  1. Design Capacity is the lesser of (1) the Characteristic Capacity multiplied by the NZ Strength Reduction Factor (φ), and applicable the k modification factors following NZS 3603 and (2) the Serviceability Capacity which is the load at 6.4mm joint slip, which includes fastener slip, anchor elongation and holdown deformation. Design Capacity is the minimum of test data and structural joint calculation.
  2. The Strength Reduction Factor (φ) is 0.80 for nails in lateral load and 0.70 for other fasteners.
  3. Duration of Load Factor (k1) is as shown. Reduce Duration of Load Factor where applicable. Capacities may not be increased.
  4. Timber species for joint design is seasoned Radiata Pine, which is New Zealand Joint Group J5 per NZS 3603 Table 4.1.
  5. The Designer must specify anchor bolt type, length and embedment.
  6. Anchor bolt nut should be finger tight plus 1/3 to 1/2 turn with a hand wrench. Care should be taken not to over-tighten the nut.
  7. Post or beam design by Designer. Posts may consist of multiple members provided they are connected independently of the holdown fasteners.
  8. Structural composite timber columns have sides that either show the wide face or the edges of the timber strands/ veneers, known as the narrow face.
  9. Simpson Strong-Tie stainless-steel connectors require stainless-steel fasteners.
  10. Values in the table reflect installation into the wide face.
  11. Holdowns and tension ties are for use in vertical or horizontal applications.
  12. Holdowns and tension ties may be installed raised up to 460mm above the top of the concrete with no load reduction, provided that additional elongation of the anchor rod is taked into account.
 

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