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Lumber Stress Grades and Design Properties
John Galinski, P.E.
Overview
Lumber sawn from a log, regardless of species and size, is quite variable in
mechanical properties. Pieces of lumber sawn from the same log may differ in
strength by several hundred percent. For ease of use, lumber with the same
mechanical properties are placed in categories, commonly known as stress grades.
This course is intended to provide the student with an understanding of how
lumber is graded and how the mechanical properties can be adjusted for design
use.
In
this course, the student will review Chapter 6, Lumber Stress Grades and
Design Properties from General Technical Report FPL-GTR-113, “Wood Handbook
– Wood as an Engineering Material” published by the Forest Products Laboratory,
USDA Forest Service (issued March 1999).
The
student must take a multiple-choice quiz consisting of ten (10) questions at the end of this course
to earn PDH credits.
Specific Knowledge or Skill Attained
This course teaches the following specific knowledge and
skills:
- Responsibilities and
Standards for Stress Grading
- Visually Graded Structural
Lumber
- Machine-Graded Structural
Lumber
- Adjustment of Properties
for Design Use
Course
Click on the following PDF attachment and review Chapter 6 of FPL-GTR-113, “Wood
Handbook – Wood as an Engineering Material” prior to taking a quiz for credit.
Lumber Stress Grades and Design Properties (331 KB)
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To obtain PDH credits for this course, you will need to take a quiz for
credit. Click on the link below.
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