Picking usable lumber involves more than just the initial grade stamp. We can think of the stamp as the first step, but we can’t stop there.
Truss fabricators depend on the lumber supplier to provide effective grading protocols that will produce materials with predictable design values. Knots and slope of the grain are the most common and limiting factors when determining the grade of lumber.
When we go to use a piece of lumber though, we still have to be aware of its condition. Other factors—such as splits, checks and physical damage—can occur after grading and are important for the truss manufacturer to consider.
The people working in the receiving, picking, cutting, stacking, staging, and assembly processes should all be aware of lumber requirements. In addition, because damage due to decay, insect attack, fungi, and moisture intrusion is unusual, special efforts may be needed to educate your plant. This issue needs attention because it will adversely impact performance.
A detailed wood condition assessment is an essential step that must be conducted prior to use. The following illustrations are examples of such defects which should be considered unusable. Termite damage also impacts the perceived integrity of the structure. Termite evidence in a structure requires quick action on the part of the building owner. Introducing these defects to a building project can spread if not treated.
To maintain the quality of your finished product, you have to watch what is going into it.