295 322
295
MASONS SUPPLY COMPANY
Oregon (800) 537-3407 ♦ Washington (800) 537-6216
Clackamas | Eugene | West Eugene | Hillsboro | Medford | Portland | Salem | Wilsonville | Ridgefield | Seattle | Tacoma | Woodinville
M A S C O . N E T
GENERAL & TECH INFO
CHARTS
Note:
F
b
and F
v
shown above includes a 25% increase because of short term loading conditions. Horizontal shear stress adjustment
assumes members have no splits, checks or shakes.
Support spacings are governed by bending, shear or deflection. Maximum deflection
e
/270 of spacing, but not more than 1/8".
Safe Spacing of Supports for Joists or Studs
Continous Over Four or More Supports
Based on use of No. 2 Grade Spruce-Pine-Fir or Hem-Fir
Uniform Load,
Pounds per LF
(Equals Design Load,
Pounds per Sq. Ft.
Times Joist or Stud
Centers in ft.)
F
b
= varies psi E = 1,300,000 psi F
v
= 175 psi
Nominal Size Lumber, bxh (S4S) at 19% Maximum Moisture
2 x 4
2 x 6
2 x 8
3 x 6
4 x 2
4 x 4
F
b
psi
1594
1381
1275
1381
1275
1594
100
62"
88"
108"
99"
41"
77"
200
52"
74"
91"
84"
32"
65"
300
44"
65"
82"
76"
26"
59"
400
38"
56"
71"
70"
22"
55"
500
32"
50"
63"
65"
20"
52"
600
27"
43"
57"
59"
18"
48"
700
25"
39"
51"
55"
17"
44"
800
22"
35"
46"
51"
16"
41"
900
21"
32"
43"
47"
15"
39"
1,000
19"
30"
40"
43"
14"
36"
1,100
18"
29"
38"
40"
14"
33"
1,200
17"
27"
36"
38"
13"
31"
1,300
16"
26"
34"
36"
12"
29"
1,400
16"
25"
33"
34"
12"
27"
1,500
15"
24"
31"
32"
11"
26"
1,600
15"
23"
30"
31"
11"
25"
1,700
14"
22"
29"
30"
10"
24"
1,800
14"
22"
29"
29"
10"
23"
1,900
13"
21"
28"
28"
9"
22"
2,000
13"
21"
27"
27"
9"
21"
2,200
13"
20"
26"
26"
9"
20"
2,400
12"
19"
25"
24"
8"
19"
2,600
12"
18"
24"
23"
8"
18"
2,800
11"
18"
24"
22"
7"
17"
3,000
11"
17"
23"
22"
7"
17"
Joist or Stud Centers
Support
Spacing
Support
Spacing
Support
Spacing