How Should Defects Be Recorded When Inspecting a Critical Plate?
A critical plate is a plate with a Joint Stress Index of 80% or greater. The ANSI/TPI 1–2014 Standard stipulates that critical plate inspections must be conducted when completing the three inspections per station/per shift/per week requirement. On average, the standard requires one...
How Important is Angulation? Why is It Important?
Per ANSI/TPI 1–2014, National Design Standard for Metal Plate Connected Wood Truss Construction, plates should be installed within a 10 degree tolerance. So what happens when the plate is rotated and exceeds this requirement?
The simple answer is: the configuration and design of...
What is the Most Common Fabrication Issue That Impacts a Truss?
The most common problem typically encountered is excessive defects in the plated area of the truss. While some defects are acceptable in the plated area, the degree of defects depends on the actual joint situation and forces at the joint.
Connector sizes are controlled by design, handling,...
Mind the (Member) Gap
Everyone knows that member gaps can be caused by uncalibrated saws and poor jigging stops during truss set-up. But did you know the most likely cause of member gaps is the lumber carriage shifting or moving the lumber at an angle, thereby causing a skewed cut? This is especially true when a gang...
Wedges—Misunderstood and Underappreciated?
The lowly wedge sometimes gets very little respect. If your plant is doing it right, the wedges usually are cut from drops or culls. That’s a good way of doing it, and it sounds very simple, but not just any piece of wood is suitable for a wedge. There are important qualifications that...
Floor Truss Chord Splicers & Floor Truss Finish Roller Presses
When I decided to conduct this 12-month series of product comparisons last fall, I knew it would be a year-long commitment of my time and effort. Then and now, however, I also was convinced that it would provide useful information in a format that allows for direct comparisons on specific...
Is There Such Thing as Too Much Pressure?
Too much pressure is not only a problem in our lives, it can also be a problem in our plants. One of the most important issues when manufacturing quality trusses is plate embedment. Without proper embedment, the connector plate cannot adequately transfer load forces through the members down to...
Floor Truss Roller Presses
As discussed last month, this year will we be providing a series of product comparisons in each issue.
The guidelines we have used in assembling this series are:
Each product will be limited to only the information available to customers via the internet
A comparison of standard...
Seeing the Need for Quality Assurance AND Training
When you look at this photo, what do you see? The photo is an actual picture taken during a plant audit, but just imagine this was taken at your truss plant. In the photo, the second side of the floor truss is set up in the floor machine with the connector plate positioned and ready to receive...
A Case for Providing More Design Info to the Assembly Table
It’s true that, by nature, the materials currently used for wood trusses can vary in strength and properties. Given a specific lumber size and grade, truss builders often need to evaluate lumber picked, cut, and provided to build the specific job at hand. After verifying the lumber grade,...