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Technical

Forest & Lumber

Grading Rules

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Technical Section

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NHLA Grading Rules Review

Range of Quality

#1 Common
 

4'

2-1/2"

― 4' Standard Length (100% clear) ―

As mentioned on our 'Grading Rules' default page, the minimum requirements for FAS 1 Face, Selects and #1 Common grades define the poorest piece but must contain all boards up to a clear board in each grade.

The #1 Common Grade must yield a minimum of 66-2/3% Clear Face Cuttings up to a clear board.  The clearest board defined in the NHLA Rules Book is a board of #1 Common with a one foot surface measure.  The NHLA Rule Book states that a minimum size board of kiln dried #1 Common lumber (2-1/2" x 4') must be "clear both faces".

Note:

Smaller boards in all NHLA Grades provide clearer lumber

Short, narrow boards are a real bargain.

  

8'

6"


(Shading denotes wane)

 

4' SM 

Minimum #1 Common Boards

 

8'

6"

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Knot

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4' SM

Higher Yield #1 Common

The above illustration of #1 Common lumber define pieces of the #1 Common Grade.  Boards with a 4 foot surface measure must yield a minimum of 32 cutting units (Foot Long Hotdogs).  The top illustration contains 32 cutting units (the minimum) and the lower illustration contains 45 cutting units.  These illustrations are examples of the minimum and higher requirements of the #1 Common Grade.

Note:

All examples and illustrations on our site apply to standard grading rules.  Certain species of hardwoods are graded under "Special Rule".  Please call Hogan Hardwoods & Moulding for any "Special" NHLA Rules that may apply.

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