Our industry design standard, ANSI/TPI 1, regulates numerous elements in constructing roof and floor trusses. The following is a brief non-exhaustive summary: Lumber grades and moisture content Pedigree of lumber grades and lumber management Controls on truss profiles Verification of...

When given a truss design project, the Truss Designer needs all of the loading parameters before starting work on it. This article will specifically discuss the Thermal Factor (Ct), which is part of the snow load calculations. As with any load parameter, using the wrong value will result in a...

Chapter 3 of ANSI/TPI 1-2022, the National Design Standard for Metal Plate Connected Wood Trusses, provides the component manufacturer with the Quality Criteria they must follow to ensure the metal plate connected wood trusses (MPCWT) they build meet the design assumptions. Section 3.4.2 Lumber...

Quality Assurance continues beyond the truss plant, so it’s important to keep that in mind as you’re preparing your products for handling and use by someone else. For example, this article poses the question: should component manufacturers (CMs) mark the ends of trusses? For that...

Inspirado por las frecuentes solicitudes de una referencia rápida, he creado una hoja única de la guía del Capítulo 3 de ANSI/TPI 1, similar a una versión de CliffsNotes del estándar. Tenga en cuenta que se omiten detalles importantes; para una comprensión completa, consulte el estándar...

In early November, the Truss Plate Institute (TPI) was proud to announce the launch of our two new ANSI standards projects: TPI 2 – National Standard for Testing Metal Plate Connected Wood Trusses and TPI 3 – National Design Standard for Bracing Metal Plate Connected Wood Trusses....

A test lab is a building product manufacturer’s one-stop shop for engineering, manufacturing quality, and performance verification. Whether supporting new product development, regulatory submissions, or customer assurance testing, a test lab must have the right tools to get the job done....

We enjoyed a productive week at BCMC in Omaha, strengthening relationships and renewing our commitment to the truss industry, and we hope you can say the same! Timber Products Inspection (TP) returned with our popular ANSI/TPI 1 Chapter 3 challenge truss, designed to test participants’...

What is an extended top chord bearing truss? For those who don’t see these types of trusses on a daily basis, an extended top chord bearing truss is simply that which contains a top chord extension or tail supported by a bearing. This tail can then bear on a wall, beam, another truss, or...

Inspired by frequent requests for a quick reference, I’ve created a single-sheet ANSI/TPI 1 Chapter 3 guide—similar to a CliffsNotes version of the standard. Please note that important details are omitted; for a complete understanding, consult the full standard, National Design...