Newest Connector to Satisfy Code

“Does Simpson Strong-Tie write the building code?”

If you work at Simpson Strong-Tie, you get asked this question from time to time when you’re in the field. Over the years, I’ve heard it dozens of times, and because the answer is obviously “no,” it makes you wonder why this belief persists with so many people in the industry. Well, here is my theory: We develop and test products for new code provisions faster than it takes states to adopt the newest codes. So a designer, contractor or building official will often hear about a new Simpson Strong-Tie product or tested application that fills a need before their state building code even defines what that need is. Here are some recent examples:

  • The FWAZ foundation anchor released in 2007 for a 2006 IRC provision that addresses soil pressure loads on basement walls
  • Strong-Drive® SDS screw testing for deck ledgers published in 2008 as alternates to bolts and lags that weren’t prescribed in the IRC until the 2009 edition
  • The DTT2 deck tension tie released in 2009 is used for a 2009 IRC provision that addresses lateral loads on decks
  • BPS ½ -6 bearing plate released in 2011 to address new provisions for shear wall bearing plates in the 2008 SDPWS, which is referenced in the 2009 and 2012 IBC

The latest example is the DTT1Z deck tension tie. Two of our engineers, Randy Shackelford and David Finkenbinder, attended the ICC hearings that resulted in the new 2015 IRC. As soon as a new provision was passed to provide an alternate 750-pound deck lateral load connection (submitted by Washington Assoc. of Building Officials, not Simpson Strong-Tie) we began working on a connector designed to do the job. After several months of R&D, field trials and new tooling, our presses began to stamp out the first production run of the DTT1Z to meet the 2015 IRC provision on December 30, 2014.

DTT1Z Production Run
DTT1Z Production Run
2015 IRC Detail
2015 IRC Detail

The IRC detail shows an ideal condition where the bottom of the deck joist lines up with the wall plates in the house. We tested this application, but we also wanted to support variations that may come up in the field. The results of this testing appear in our T-C-DECKLAT15 technical bulletin. We also tested the DTT1Z with our Strong-Drive® SDWH Timber-Hex HDG screw and our Titen HD® concrete screw anchor so it can be used in a variety of applications, including prescriptive wall bracing and (very) light shear walls. Many of these applications are covered in the code report (ER130) that was completed just this past week.

2015 IRC Test Setup
Test setup: 2015 IRC detail
Joist Scab Test Setup
Test setup: Blocking attached to side of joist
Joist Blocking Test Setup
Test setup: Blocking running between joists

 

 

 

 

 

 

 

If you are interested in reading more about the new IRC deck provisions, Randy wrote about them in his Code Corner column in the current Structural Report and David wrote about them in this blog last August.

In case you are wondering how I respond when asked if we write the code, lately I have been answering it with another question: No, but do you know who is responsible for writing the code? My answer to this is “all of us.” If you don’t like what is in there now, work with an association that represents your interests (NCSEA for a lot of us) to submit a code-change proposal, or even submit one yourself. There is no guarantee it will get in, but if it involves a connection, I can guarantee we will get working on it right away!

Let us know if you see a need for a new connection product. If you already have a product idea and would like to work with us to develop it, you can more-formally submit it here.

Shane Vilasineekul

Author: Shane Vilasineekul

When I started job searching my senior yearof college, I had several interviews with consulting firms before I saw a small flier, tacked to a hallway bulletin board, for interviews at a company called Simpson Strong-Tie. The name was new to me (wood design was not in the curriculum) and I hadn’t considered working for a manufacturing company, but I decided to schedule an interview (partly because The Simpsons was my favorite show at the time) and was fortunate to get the job.

At the time, one of my biggest concerns was that I would gain little structural engineering experience working for a “joist hanger” company. Well, it turned out that Simpson Strong-Tie was growing its line of concrete anchors and lateral force-resisting systems, and it was the Engineering Department’s philosophy that we had to be experts in all areas relating to these product lines in order to support them. Over the next several years I worked with, and was mentored by, some great engineers who helped me develop as a structural engineer and truly appreciate our profession. There are still times when I feel I haven’t paid my dues, but I am quickly reminded by my colleagues how lucky I am to have never had to worry about billable hours.

I graduated from Ohio State University in 1999 with a BS in Civil Engineering and hold a PE license in several states. For the last several years, I have been managing the engineering group out of the Simpson Strong-Tie Columbus, Ohio branch, which covers 24 states across the Midwest, Mid-Atlantic, and New England. The engineers at our branch focus on supporting our products through education, new product development, and by offering technical expertise.