DTT2/HD2AHDG Deck Post Connectors

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® screws (SDS) (included) and accepts a 1/2" machine bolt or anchor bolt.

Now two more options are available to further increase applications for this versatile product.

Two New Versions of the DTT2 Offer More Solutions for Decks and Shearwalls

DTT2SS Stainless-Steel Tension Tie for Decks
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 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)

DTT2Z-SDS2.5 for Double-Stud Applications in Shearwalls
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 DTT2Z is a new holdown solution for site-built shearwalls

Meets minimum requirements for many alternate braced-wall panels per Section R602.10.6.1 of the 2006 IRC (see table R602.10.6, item 1)
Installs quickly onto double 2x post and attaches to a 1/2" diameter anchor
The DTT2Z was tested in accordance with the ICC-ES acceptance criteria for Holdowns Attached to Wood Members (AC155)

The HD2AHDG holdown has been tested as a lateral anchor for the guardrail post connection. See technical bulletin T-GRDRLPST10 for more information and installation details. The HD2AHDG is also load rated as a holdown for light duty shearwalls and braced wall panels.

Material: DTT2 - 14 gauge; HD2AHDG Body - 12 gauge, Base -7 gauge

Finish: DTT2Z - ZMAX® coating; DTT2SS - type 316 stainless steel; HD2AHDG - HDG and may be ordered galvanized; see Corrosion Information.

Installation: Use all specified fasteners. See General Notes.

DTT2

Deck Installation

Install the DTT2 to the deck joist or blocking using Simpson Strong-Tie® Strong-Drive® screws (SDS) (included).
Guardrail-Post Connection
For guardrail-post reinforcement, install a 1/2" diameter machine bolt or threaded rod through the post and into the seat of the DTT2.
Lateral-Load Connection
For deck-to-house attachment, use 1/2" diameter threaded rod to connect the two DTT2s.
A standard cut washer (included) must be installed between the nut and the seat of the DTT2 for all installations.
Simpson Strong-Tie® Strong-Drive® screws (SDS) install best with a low-speed, high-torque drill with a hex-head driver.
For more information on safe deck building products and practices see our Deck Framing Connection Guide (F-DECKCODE)

Shearwall Installation

Install DTT2 to post using the included Simpson Strong-Tie® Strong-Drive® screws (SDS).
A standard cut washer (included) must be installed between the nut and the seat.
See cast-in-place anchorage solutions, or see Simpson Strong-Tie Anchor Systems for post-installed anchorage solutions.
Simpson Strong-Tie® Strong-Drive® screws (SDS) install best with a low-speed, high-torque drill with a hex-head driver.

HD2AHDG

Bolt holes shall be a minimum of 1/32" to a maximum of 1/16" larger than the bolt diameter (per NDS, section 11.1.2).
A washer is not required between the base plate of the holdown and the anchor nut.
Locate on wood member to maintain a minimum distance of seven bolt diameters, distance is automatically maintained when end of wood member is flush with the bottom of the holdown.
Bolts should be snugly tightened.

					Legacy Reports
	IAPMO ES ER	ICC-ES ESR	CITY OF LOS ANGELES	STATE OF FLORIDA	ICC-ES NER	ICC-ES ER	ICC-ES ES
DTT2SS	No code listing: Please contact us for test data.
DTT2Z		ESR-2330 / ESR-2523 *	RR25720	FL10441
DTT2Z-SDS2.5	No code listing: Please contact us for test data.
HD2AHDG	ER-143		RR25828	FL12708

	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	DTT2Z: DWG \| DXF DTT2Z installed: DWG \| DXF
HD2AHDG	None for this model	None for this model