0080-07-07-.05
Moisture Content, Surface Conditions, Standard Sizes And Tally
Cite as Tenn. Comp. R. & Regs. 0080-07-07-.05
PRACTICES.
(1)
Wood moisture content and drying
(a)
Moisture content (MC) of wood is measured by weighing a sample of wood before and
after drying it in a hot oven (103C/220F). The percent of MC is calculated as (wet weight-
dry weight)/dry weight x 100.
(b)
Lumber shall be designated as green lumber or dry lumber.
1.
Green lumber has a MC more than 19% including lumber that is graded just after
sawing with a high moisture content and lumber that has been stickered and dried
but still has moisture content above 19%.
2.
Dry lumber is dried to a maximum moisture content of 19% MC. No more than 5%
of the pieces in a shipment shall have a MC of 19%. Lumber sold as dry lumber
may be either kiln dried or air dried.
3.
Kiln dried (KD) means that lumber has been dried in a drying chamber. The
designation of KD may be used as amplification to the dry lumber designation
provided in the certification.
4.
In the oven-dry method it is acceptable to use electrical meters to estimate the
moisture content.
(c)
Wood surface conditions
1.
Lumber shall be designated as surfaced lumber, sawn-to-size lumber, or rough
lumber.
2.
Surfaced lumber, or dressed lumber, is lumber that has been surfaced by a
machine to attain smoothness of surface and uniformity of size. Lumber grades
refer to lumber that is surfaced four sides (S4S) and actual dressed sizes equal
the minimum thicknesses and widths for surfaced lumber as shown in Table 3.
Table 3 Board Footage of Lumber
Board Foot Volume of 2” Nominal Thickness of Varying Width and Length
Length
Width in Inches
Feet
Board Feet per Piece (BF)
2.0
4.0
6.0
8.0
10.0
12.0
2.3
4.7
7.0
9.3
11.7
14.0
2.7
5.3
8.0
10.7
13.3
16.0
3.0
6.0
9.0
12.0
15.0
18.0
3.3
6.7
10.0
13.3
16.7
20.0
NATIVE SPECIES LUMBER
CHAPTER 0080-07-07
3.7
7.3
11.0
14.7
18.3
22.0
4.0
8.0
12.0
16.0
20.0
24.0
4.3
8.7
13.0
17.3
21.7
26.0
4.7
9.3
14.0
18.7
23.3
28.0
5.0
10.0
15.0
20.0
25.0
30.0
5.3
10.7
16.0
21.3
26.7
32.0
5.7
11.3
17.0
22.7
28.3
34.0
6.0
12.0
18.0
24.0
30.0
36.0
6.3
12.7
19.0
25.3
31.7
38.0
6.7
13.3
20.0
26.7
33.3
40.0
Board Foot Volume of 4” Nominal Thickness of Varying Width and Length
Length
Width in Inches
Feet
Board Feet per Piece (BF)
4.0
8.0
12.0
16.0
20.0
24.0
4.7
9.3
14.0
18.7
23.3
28.0
5.3
10.7
16.0
21.3
26.7
32.0
6.0
12.0
18.0
24.0
30.0
36.0
6.7
13.3
20.0
26.7
33.3
40.0
7.3
14.7
22.0
29.3
36.7
44.0
8.0
16.0
24.0
32.0
40.0
48.0
8.7
17.3
26.0
34.7
43.3
52.0
9.3
18.7
28.0
37.3
46.7
56.0
10.0
20.0
30.0
40.0
50.0
60.0
10.7
21.3
32.0
42.7
53.3
64.0
11.3
22.7
34.0
45.3
56.7
68.0
12.0
24.0
36.0
48.0
60.0
72.0
12.7
25.3
38.0
50.7
63.3
76.0
13.3
26.7
40.0
53.3
66.7
80.0
3.
Sawn-to-size lumber is lumber uniformly sawn to the dressed size for surfaced
lumber but not planed on the faces.
4.
Rough lumber has not been surfaced. It differs from sawn-to-size lumber because
rough lumber is oversized to allow for shrinkage or to allow surfacing.