Civil Engineering Reference
In-Depth Information
Ta ble 3-1
Your Guide to New Sizes of Lumber
Nominal (What You Get)
Standard
(What You Order)
Dry or Seasoned
∗
Green or Unseasoned
†
1
×
4
3
/
4
×
3
1
/
2
25
/
32
×
3
9
/
16
1
×
6
3
/
4
×
5
1
/
2
25
/
32
×
5
5
/
8
3
/
4
7
1
/
4
25
/
32
7
1
/
2
1
×
8
×
×
1
×
10
3
/
4
×
9
1
/
4
25
/
32
×
9
1
/
2
1
×
12
3
/
4
×
11
1
/
4
25
/
32
×
11
1
/
2
2
×
4
1
1
/
2
×
3
1
/
2
1
9
/
16
×
3
9
/
16
×
1
1
/
2
×
5
1
/
2
1
9
/
16
×
5
5
/
8
2
6
1
1
7
1
1
9
7
1
2
×
8
/
2
×
/
4
/
16
×
/
2
2
×
10
1
1
/
2
×
9
1
/
4
1
9
/
16
×
9
1
/
2
2
×
12
1
1
/
2
×
11
1
/
4
1
9
/
16
×
11
1
/
2
4
×
4
3
1
/
2
×
3
1
/
2
3
9
/
16
×
3
9
/
16
3
1
/
2
5
1
/
2
3
9
/
16
5
5
/
8
4
×
6
×
×
4
×
8
3
1
/
2
×
7
1
/
4
3
9
/
16
×
7
1
/
2
4
×
10
3
1
/
2
×
9
1
/
4
3
9
/
16
×
9
1
/
2
4
×
12
3
1
/
2
×
11
1
/
4
3
9
/
16
×
11
1
/
2
∗
19 percent moisture content or under.
†
More than 19 percent moisture content.
Softwood Lumber Grades for Construction
The grading requirements of construction lumber are related specif-
ically to the major construction uses intended, and little or no
further grading occurs once the piece leaves the sawmill. Con-
struction lumber can be placed in three general categories—stress-
graded, nonstress-graded, and appearance lumber.
Stress-graded
and
nonstress-graded lumber
are employed where the structural in-
tegrity of the piece is the primary requirement.
Appearance lumber
encompasses those lumber products in which appearance is of pri-
mary importance (structural integrity, although sometimes impor-
tant, is a secondary feature).
Stress-Graded Lumber
Almost all softwood lumber nominally 2 to 4 inches thick is stress-
graded. Lumber of any species and size, as it is sawed from the log,
is quite variable in its mechanical properties. Pieces may differ in
strength by several hundred percent. For simplicity and economy in
Search WWH ::
Custom Search