Engineering & Testing

The Truss Plate Institute (TPI) announced in a July update to its Cross-Platform Initiative Blog that it is building upon Uniform Data Standard (UDS), developed by SBCA’s IT Committee.

One of the Truss Plate Institute’s (TPI) 2019 initiatives is a response to the industry unified data standard (UDS) work undertaken by the Structural Building Components Association’s (SBCA) IT Committee in 2018 to provide more efficient and timely communication between manufacturing equipment and truss design and management software. 

Kylmala Truss is certified in the SBCA In-Plant Quality Control (QC) program and receives quarterly 3rd Party Quality Audits (QA) from the SBCRI-TPI 3rd Party inspection program.

In 1992 the WTCA Board of Directors was reviewing TPI-85 Appendix P: Quality Standard for Metal Plated Connected Wood Trusses and found a disconcerting term; “firm embedment”, where a certain percentage of the plate had to be in metal to wood contact. This lead to a WTCA project, by Mr. Pat McGuire, to determine if “firm embedment” was possible for truss manufacturers to comply with consistently.

The short answer is no, not according to the law. Why? Because the building official does not have jurisdiction over professional engineers. They only have authority with respect to enforcing the specific provisions of the building code that has been adopted into law.

SBCA’s Quality Control and Engineering and Technology committees were heavily involved in both the creation and the execution of SBCA's weathering research and testing program, this article discusses how that plan was finalized and reviewed.

With all aspects of previous data, location planning and weather monitoring decided upon, the final decision to make was how the trusses were going to be set out.The trusses needed to be stored in a way that closely replicates real world conditions.

Heavy rains, high humidity, and large temperature drops at night create a perfect place to store trusses if the goal is to potentially damage trusses from weather exposure. This was the thought process SBCRI followed in order to select locations for the weathering testing program.

The QC Committee met last week at the SBCA OQM to discuss progress in the Digital Quality Control program and the testing programs underway that will provide data to support the assessment of plated joint quality per ANSI/TPI 1 Chapter 3. 

Whether it’s trusses left in the yard for too long, or trusses left on the jobsite, weathering is a topic that all component manufacturers encounter in their line of work.