Face the facts. Trusses are large and bulky. They take up a lot of space and often cannot be stored inside. They have a shelf life. What are the factors that need to be considered? Are there ways to extend the shelf life of trusses? Are any of the methods currently used counterproductive? In...

Can you make substitutions of different lumber grades and species? The short answer is: yes. Even so, you have to take several factors into consideration when making a substitution. To narrow the discussion, let’s focus on southern pine. The substitution must have design values equal to...

I-joists dominate the joist market due to their high material efficiency and low manufacturing cost. However, this product has disadvantages, including difficulty in HVAC installations and the possibility of bottom chord support only. Therefore, the market would pay a considerable premium for a...

In December 2019, Structurlam Mass Timber Corporation, the leading mass timber manufacturer in North America, announced the expansion of its operations into the United States, with a plant in Conway, Arkansas, set to open in mid-2021. The Canadian-based company, in which Walmart has made an...

For more than 70 years, people have been using machines to assist in the grading of lumber. This article summarizes the machine grading methodologies for producing Machine Stress Rated Lumber (MSR) and Machine Evaluated Lumber (MEL) and highlights the similarities and differences between MSR and...

As a follow-up to our January 2021 All Things Wood article by Frank Woeste and Don Bender, “Hybrid Lumber” Grade Stamps Require Special Attention, we are pleased to report that additional information is now available for designers and code officials. The following article appears...

Many of the problems we hear about and actually see on jobsites, both offsite and site built, involve the poor quality of standard SPF #2. When I was the General Manager of a large lumber yard back in the 1980s, it wasn’t much better. I can still remember the yard men cutting the steel...

This series of articles, Wood Structure Design Basics, is intended to serve truss designers (TDs) and others who are new to the wood construction industry and/or may not have the opportunity to study the basics of wood design in a formal setting such as a university. The mix of basics will...

While admiring a Mass Timber building rising nearby, I wanted to find out if CMs can benefit from this business. Katerra apparently thinks so, first becoming a CM and later a CLT manufacturer. So far, the supply of CLT is limited – the Katerra plant is 2500 miles from this Virginia jobsite...

On a recent truss plant visit, I watched a group of truss builders quickly assembling a structural gable truss. Most of the webs had been installed and the builders were top and back plating the truss. As I approached the builders, they relaxed their pace just a notch as I walked up to the web...