Simpson Strong-Tie SDWC Truss Screws in Raised Heel (Energy Heel) Trusses
lgr123
| Posted in Construction Techniques on
Simpson publishes reduced uplift ratings for the SDWC truss screws in raised heel trusses (C-F-2023TECHSUP, pages 91–92). The amount of reduction depends on the location of the truss plate near the connection.
However, they only publish uplift ratings for a single SDWC screw in raised heel trusses, not two screws, even though they provide two-screw uplift ratings for standard trusses (C-F-2023TECHSUP, pages 87–88).
Are two-screw configurations allowed in raised heel trusses? If so, where can the load ratings be found?
Replies
I would reach out to a Simpson engineer regarding this.
I contacted Simpson engineering technical support. They said if it's not published, it hasn't been tested. It's a strange omission, since most roof trusses these days seem to have 9" or higher heels, with the top chord being several inches above the top plate. And most truss plates aren't large enough be "reinforced" (C-F-2023TECHSUP, p. 91). I guess a lot of people are only getting 280 lb uplift capacity when they think they are getting 485 lb +?
The Simpson Strong-Tie SDWC Truss Screws are often used in raised heel trusses, also known as energy heel trusses, for various construction applications. These screws are designed to provide strong and reliable connections between truss members and other structural elements.
Raised heel trusses are specifically engineered to create additional space for insulation and ventilation in the attic area of a building. The use of SDWC Truss Screws in these trusses helps ensure that the connections are secure and can withstand the loads and forces that may be exerted on the structure.
When using SDWC Truss Screws in raised heel trusses, it's essential to follow the manufacturer's installation instructions and guidelines to ensure proper performance and compliance with building codes. Additionally, consulting with a structural engineer or construction professional can help ensure that the chosen fasteners and construction methods meet the specific requirements of your project.