TABLE 6.1 Properties of Sections for Standard Lumber Sizes
[Dressed (S4S) sizes, moment of inertia, and section modulus are given with respect to
xx axis, with dimensions b and h, as shown on sketch]Standard Moment of Section
Nominal dressed size Area of inertia modulus Board feet
size S4S section per linear
bh b h foot of piece2 4 5.89 6.45 3.56
2 6 8.93 22.53 8.19 1
2 8 12.19 57.13 15.23Source: National Lumber Manufacturers Association.15 8 71 2 11 315 8 51 2(^2)
(^13)
(^5)
8 ^3
(^5)
8
S
bh^2
6
I
bh^2
Abh^212
h/2
X
b
h X
158