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ALSC Machine Graded Lumber Policy

The Machine Graded Lumber Policy of the ALSC sets forth the procedures for grademarking of machine graded lumber conforming to the American Softwood Lumber Standard PS 20. Products currently included are Machine Stress Rated (MSR) lumber and Machine Evaluated Lumber (MEL)

Also included in the policy are requirements specific to the machine graded lumber process and to the approval of the machines themselves.

An Adobe pdf version of the current Machine Graded Lumber Policy is available here.

Also provided is an Adobe pdf version of lumber grading machines approved by the Board of Review to date.

List of Approved Machines

Foreign Species Guidelines for MSR click here

Interpretations of enforcement regulations are available in the ALSC ratified responses click here

Background information for potential ALSC members click here


Accredited Agency List
Grading Rules
Enforcement Regs.
Foreign Lbr. Policy
Glued Lbr. Policy
Machine Graded
Spans for Decking
Addt'l Documents
PS 20

 Contact ALSC @

American Lumber Standard Committee, Inc.    7470 New Technology Way, Suite F     Frederick,  MD   21703
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