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

If you enjoyed this post, make sure you subscribe to my RSS feed!

About the author

Robert Robillard

Robert Robillard

Carpenter / Remodeler / Editor / Writer / Video Talent

Robert Robillard is a general contractor, carpenter and operates a remodeling company located in Concord, MA. He is the editor of and ToolBoxBuzz, and a has a weekly column in the Sunday Boston Globe. Rob is a recognized leader in tool and how-to information for building professionals, he hosts the Concord Carpenter Cable TV Show, offering advice on home repairs and maintenance. On his website, Rob uses his knowledge and experience to help and educate on best practices in the remodeling industry. His motto: “Well done is better than well said!”. Contact Rob at:

All posts by Robert »

Not what you're looking for?

Search for more articles here. Enter keywords like roof leak, bookcase, deck, etc to find your topic.

© Copyright 2017 A Concord Carpenter · All Rights Reserved