Basic lumber grades
An overview of NHLA grades. October 15, 2001
Can anyone explain to me what the four basic NHLA grades are for hardwood?
Take a look at this article, Understanding Hardwood Lumber Grading
See the NHLA website. They have a nice picture guide.
The best grade is FAS and it must be 83% clear or clearer on the poorest side. Clearness is measured in large rectangular areas called cuttings.
The next grade is No. 1 Common, which must be 67% clear on the poor side, etc.
Next is No. 2 Common, which is 50% clear. Then No3A Common, which is 33% clear. Then No. 3B, which is 25% sound.
There is also a grade called Select (which includes another popular grade called FAS 1-Face). Selects are FAS on the good side and No. 1 Common on the poor side.
There are many other restrictions, including number of cuttings, size of cuttings, and size of lumber.
Gene Wengert, forum technical advisor
Would you like to add information to this article?
Interested in writing or submitting an article?
Have a question about this article?
Have you reviewed the related Knowledge Base areas below?
KnowledgeBase: Lumber and Plywood
KnowledgeBase: Lumber & Plywood: Buying
KnowledgeBase: Primary Processing: General
KnowledgeBase: Primary Processing
KnowledgeBase: Primary Processing: Lumber Grading
KnowledgeBase: Wood Engineering: Wood Properties
KnowledgeBase: Woodworking Miscellaneous
KnowledgeBase: Knowledge Base
All rights reserved. No part of this publication may be reproduced in
any manner without permission of the Editor.
Review WOODWEB's Copyright Policy.
The editors, writers, and staff at WOODWEB try to promote safe practices.
What is safe for one woodworker under certain conditions may not be safe
for others in different circumstances. Readers should undertake the use
of materials and methods discussed at WOODWEB after considerate evaluation,
and at their own risk.
335 Bedell Road
Montrose, PA 18801
Copyright © 1996-2017 - WOODWEB ® Inc.