Thickness and Width |
Nominal
(inches) |
Nominal
(mm) |
Rough
(inches) |
Rough
(mm) |
Dressed
(inches) |
Dressed (mm) |
5 |
127 |
4-3/4 |
121 |
4-1/2 |
114 |
6 |
152 |
5-3/4 |
146 |
5-1/2 |
140 |
8 |
203 |
7-3/4 |
197 |
7-1/2 |
191 |
10 |
254 |
9-3/4 |
248 |
9-1/2 |
241 |
12 |
305 |
11-3/4 |
298 |
11-1/2 |
292 |
Over 12 |
Over 305 |
1/4 off |
6mm off |
1/2 off |
13mm off |
Note: Full sawn timbers have the same dimension as nominal.
Grade Classifications
Depending upon size, Western Red Cedar is classified as Light Framing, Structural Joists and Planks, Beams and Stringers, or Posts and Timbers. In general, the grades referred to herein are rough sawn.
Light Framing is lumber 2 to 4 inches (51mm to 102mm) thick and 2 to 4 (51mm to 102mm) inches wide either rough sawn or surfaced four sides (S4S).
Structural Joists and Planks are rectangular members 2 to 4 inches (51mm to 102mm) thick, 5 inches (127mm) and wider, either rough sawn or surfaced four sides (S4S).
Beams and Stringers are rectangular members, either rough sawn or surfaced, 5 inches (127mm) and thicker with width 2 inches (51mm) greater than thickness.
Posts and Timbers are square members, either rough sawn or surfaced, 5 inches (127mm) by 5 inches (127mm) and larger with width not more than 2 inches (51mm) greater than thickness.
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