AWS EDITION 1, 2009

54 © 2009, AWI, AWMAC, WI - Architectural Woodwork Standards - 1st Edition, October 1, 2009

As may be updated by errata at http://www.awinet.org, http://www.awmac.com, or http://www.woodworkinstitute.com/awserrata/

Section 3 - Lumber (Page 5 of 18)

PRODUCT

LUMBER RULES (continued)

These rules are not intended to create a lumber grade; they are only intended to establish the acceptable requirements

and/or characteristics after the architectural woodwork is completed or installed.

DESCRIPTION E C P



4.1

G E N E R A L

GENERAL (continued)

4.1.4 "MEMBER" refers to a piece of lumber after gluing for width or thickness.

4.1.5 LUMBER shall be plain sawn.

4.1.6

LUMBER is DIMENSIONED by thickness, followed by width (across the grain direction), followed by length

(with the grain direction).

4.1.7

SPECIAL CHARACTERISTICS, such as sapwood, heartwood, ribbon stripe, quarter sawn, rift sawn, and

vertical grain, are not required unless specified.

4.1.8 MOISTURE CONTENT of lumber shall be in compliance with Section 2.

4.1.9 EXTERIOR use of lumber for architectural millwork requires the lumber to be PRESERVATIVE TREATED in

accordance with WDMA I.S. 4 (latest edition), unless the lumber is classified as "Resistant or Very Resistant"

in accordance with the Forest Products Laboratory (latest edition) Wood Handbook, Table 3-10.

4.1.10 GLUING for thickness and/or width is permitted as governed by this Section.

4.1.11 ADHESIVE used to glue for thickness, width, or lay-up of veneered construction shall be for the intended

purpose, applied in accordance with the manufacturer's instructions, and be:

4.1.11.1 Type I when intended for exterior use.

4.1.11.2 Type II when intended for interior use.

4.1.12 PHILIPPINE MAHOGANY shall permit the use of Lauan, Tanguille, and other natural Philippine species.

4.1.13

SPECIES NOT specifically COVERED by these standards shall be as agreed to between design

professional and manufacturer/installer as to length requirements and size/exposed area of permitted natural

characteristics.

4.2

M A T E R I A L 

MATERIAL

4.2.1

T H I C K N E S S

FINISHED THICKNESS of S4S and patterned members shall conform to the following minimum size:

4.2.1.1 Nominal 4/4 or 1" (25 mm) = 11/16" (18 mm)

4.2.1.2 Nominal 5/4 or 1-1/4" (32 mm) = 15/16" (24 mm)

4.2.1.3 Nominal 6/4 or 1-1/2" (38 mm) = 1-3/16" (30 mm)

4.2.1.4 Nominal 8/4 or 2" (51 mm) = 1-1/2" (38 mm)

4.2.1.5 Nominal 10/4 or 2-1/2" (64 mm) = 2" (51 mm)

4.2.1.6 Nominal 12/4 or 3" (76 mm)) = 2-1/2" (64 mm)

4.2.1.7 Nominal 16/4 or 4" (102 mm) = 3-1/2" (89 mm)

Nominal Thickness Finished

Thickness

4.2.2

W I D T H 

FINISHED WIDTH of S4S and patterned members shall conform to the following minimum size:

4.2.2.1 Nominal 1" (25 mm) = 11/16" (18 mm)

4.2.2.2 Nominal 2" (51 mm) = 1-1/2" (38 mm)

4.2.2.3 Nominal 3" (76 mm) = 2-1/2" (64 mm)

4.2.2.4 Nominal 4" (102 mm) = 3-1/2" (89 mm)

4.2.2.5 Nominal 5" (127 mm) = 4-1/4" (108 mm)

4.2.2.6 Nominal 6" (152 mm) = 5-1/4" (133 mm)

4.2.2.7 Nominal 8" (203 mm) = 7" (178 mm)

4.2.2.8 Nominal 10" (254 mm) = 9" (229 mm)

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