Allowable loads have been increased for wind or earthquake loading with no further increase allowed. Reduce where other loads govern.
DTT1Z installations with allowable loads below 750 lb. do not satisfy the 2015 IRC requirements for deck-to-house lateral load connections.
The Strong-Drive® SDWH Timber-Hex HDG screw with a minimum of 3″ thread penetration into dry lumber has an allowable withdrawal load (160) of 1,380 lb. into SP, 1225 lb. into DF, and 1,020 lb. into SPF/HF.
Load values are valid if the product is flush with the end of the framing member or installed away from the end.
The guardrail post illustration above addresses an outward force on the guardrail. An additional DTT2Z can be added at the lower bolt to address an inward force.
A 3/8″ HDG round washer is required with the use of a lag screw.
On a Sunday evening in the summer of 1956, Barclay Simpson’s doorbell rang. A neighbor’s brother had stopped by to ask if he could make a product to connect the ends of 2x4s for a roof. Barclay replied, “Of course!” So he sat down with his plant foreman, developed some rough sketches and used a punch press to create his first joist hanger.
That simple beginning was about more than just solving problems. For Barclay, it was about putting the customer first. Our phrase–”Our customers are our bosses”– is a simple philosophy that permeates all that we do.
At Simpson Strong-Tie, it’s about enjoying what we do, doing it right and supporting our customers every step of the way–from order placed to product installed.
Today, Simpson Strong-Tie is the world leader in structural product solutions–solutions that not only help our customers, but help make structures safer and stronger. The company is recognized as the genuine connector brand in the residential construction industry, and also for its ever-expanding offering of shearwalls, moment frames and fasteners. In the last two decades, the company has expanded further with products for infrastructure, commercial and industrial construction, including mechanical anchors, adhesives and products that repair, protect and strengthen concrete and masonry.
But even with all of the growth, we still keep it simple, focusing on the core values that Barclay instilled and living up to our reputation of reliability, innovation, quality and service.