Background The model International Residential Code (IRC) permits a design live load of 30 psf for “sleeping rooms.” The model codes specify 40 psf for all other rooms. Of the annoying floor vibration complaints we have received, the most common scenario stems from the use...

At the American Wood Council, our engineers develop state-of-the-art engineering data, technology, and standards for wood products to assure their safe and efficient design. They are also very involved in our work with building and fire codes, providing the technical background and research...

Unlike solid-sawn lumber, the mechanical properties of some materials are greatly affected by ambient temperatures and solar-radiation heating, as depicted by the photograph. However, while the engineering design properties of solid-sawn lumber are not affected by ambient temperatures, they can...

Engineers Week is February 19 – 25 February 19 – 25 is National Engineers Week. The week celebrates the impact engineers make on our daily lives and encourages young people to consider engineering as a career. For a trade association, AWC employs a lot of engineers and we see the...

“Winning is about having the whole team on the same page.” Bill Walton You might wonder what a quote about winning basketball games could possibly have to do with snow loading on trusses.  As with basketball, the importance of close teamwork also applies to a project...

Take two trusses with identical profiles and environmental surroundings, and they should have the same design loads, right? Early in my career, I recall hearing a story about two identical buildings right next to each other that were designed for two different magnitudes of environmental loads....

It seems that each major hurricane tends to teach those of us in the construction industry some lesson. With Hurricane Andrew, the lessons were the importance of protection from windborne debris, and the importance of proper construction of gable ends. There are two main areas where gable...

Why are we seeing all the code change proposals regarding wood trusses in the current ICC code change/update process? It is true that there were several proposals submitted pertaining to wood truss restraint and bracing and another requiring special inspection of the installed truss...

The parts won’t hold themselves up. They have to be fastened in place. In a previous entry in this series, Randy Shackelford, PE addressed selecting a joist hanger. This article focuses on the fasteners recommended for various wood connectors. For straps, holdowns, and other...

Overview Progressive roof collapse is a roof collapse in which the failure of a single structural component triggers a chain reaction of failures that result in a large portion of a roof collapsing onto the contents below. The shifting of continuous lateral restraint is well known as a...