294 322
294
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
Support spacings are governed by bending, shear or deflection. Maximum deflection
e
/270 of spacing, but not more than 1/8".
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.
Safe Spacing of Supports for Double Ledgers or Wales Continuous
Over Four or More Supports
Based on use of No. 2 Grade Southern Pine or Douglas Fir-Larch
Uniform Load,
Pounds per LF
(Equals Design Load,
Pounds per Sq. Ft.
Times Ledger or Wale
Centers in ft.)
F
b
= varies psi E = 1,400,000 psi F
v
= 225 psi
Nominal Size Lumber, bxh (S4S) at 19% Maximum Moisture
Double
2 x 4
Double
2 x 6
Double
2 x 8
Double
3 x 6
Double
3 x 8
F
b
psi
1625
1438
1313
1438
1313
1,000
35"
51"
64"
66"
83"
1,100
33"
49"
61"
63"
79"
1,200
32"
47"
59"
60"
76"
1,300
30"
45"
56"
58"
73"
1,400
29"
43"
54"
56"
70"
1,500
28"
42"
53"
54"
68"
1,600
27"
40"
51"
52"
66"
1,700
26"
39"
49"
51"
64"
1,800
25"
38"
48"
49"
62"
1,900
24"
37"
47"
48"
60"
2,000
23"
36"
45"
47"
59"
2,200
21"
34"
43"
44"
56"
2,400
20"
32"
42"
43"
54"
2,600
19"
30"
40"
41"
51"
2,800
18"
29"
38"
39"
50"
3,000
18"
28"
36"
38"
48"
3,200
17"
26"
35"
37"
46"
3,400
16"
26"
34"
35"
45"
3,600
16"
25"
33"
34"
44"
3,800
15"
24"
32"
33"
43"
4,000
15"
23"
31"
32"
42"
Wale or Ledger Centers
Support
Spacing
Support
Spacing
Support
Spacing