MiTek Adjustable Deck Tension Tie ADTT-TZ

By Robert Robillard on Decks And Porches

MiTek Adjustable Deck Tension Tie ADTT-TZMiTek Adjustable Deck Tension Tie ADTT-TZ

Decks are included in nearly a third of all new houses being built today. It is estimated that there are millions of decks in the U.S. that are beyond their useful life, and structurally not safe. Today, when building a deck its important to use proper building techniques, structural connectors and fasteners, such as the MiTek Adjustable Deck Tension Tie ADTT-TZ.

Adjustable Deck Tension Tie

Decks typically fail at the ledger connection, where the deck is attached to the house. The MiTek Adjustable Deck Tension Tie ADTT-TZ is a 14 gauge, G-185 galvanized, connector designed to  transfer the out of plane lateral loads of a deck. Decks degrade over time, wood expands and contracts, fasteners can rust or come loose over time,crating a potentially dangerous situation. Deck tension tie connectors connect the deck in to the house, protecting against lateral loads resulting from wind, seismic or people on the deck.

Section R507.2.4 of the 2015 International Residential Code (IRC) requires connectors to be installed transfer lateral loads from the deck to the house structure. The IRC requirement of installing a “Hold-Down Device” with a minimum allowable tension load of 750 lbs. These hold downs must be located in four (4) locations which is easily accomplished with four USP Adjustable Deck Tension Tie ADTT-TZ connectors.

MiTek Adjustable Deck Tension Tie ADTT-TZInnovative Adaptability

The MiTek Adjustable Deck Tension Tie ADTT-TZ is adjustable and can be installed with structural screws, adjacent or up to  4-3/8″ below the deck joist, eliminating the need for blocking.


  • Exceeds “Hold-Down Device” requirements per 2015
  • IRC, Section 507.2.4 [Figure R507.2.3(2)].
  • Adjustable design accommodates multiple deck joists
  • depths (2 x 8, 2 x 10, or 2 x 12). USP WS8-HDG or
  • 3/8-in HDG lag screws may be installed adjacent to or up to 4-3/8-in below deck joist
  • 2-hole break-out washer (BO-W) will work with either USP WS screws or 3/8″ lag screws.
  • Adaptability minimizes the need for additional blocking.
  • Finish: G-185 galvanizing
  • Gauge: 14 gauge

Decks need regular maintenance to stay safe and strong. If you have an existing deck, you should know how to evaluate its construction to make sure it’s structurally sound and safe. Adding four the MiTek Adjustable Deck Tension Tie ADTT-TZ connectors to an existing, older deck is one way to improve safety and get closer to modern code compliance.

Read Deck Safety – Repair vs. Replacement

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About the author

Robert Robillard

Carpenter / Remodeler / Editor

Rob Robillard is “The Concord Carpenter” Rob is a builder, general contractor, carpenter, woodworker, and editor of Concord Carpenter and ToolBoxBuzz As a General Contractor and carpenter, Rob owns and operates Concord Carpenter LLC. A full-service remodeling and construction company. Rob is a recognized leader in home building best practices and a source for how-to information for building professionals. On this website, Rob covers all aspects of home construction, building science, home improvement, woodworking, remodeling, and some of the best product and tool reviews. Rob is in charge of our Tool and Product Review series - Concord Carpenter Videos where we post all of our tool reviews and video tutorials. Rob approaches remodeling and building construction with a pragmatic and problem-solving approach. He enjoys using his knowledge and experience to help and educate building professionals as well as DIYers on best practices in the construction and remodeling industry. He's a strong advocate for "raising the bar" in the construction trades and promoting the trades to youth. #BeAMentor #Green2Great Craftsmanship, quality, and pride guide his journey on this channel The Concord Carpenter's motto: "Well done is better than well said!" : Read more about Rob

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