Technical Specifications

P. 8
Clear
Joist Span
(ft�)
11-7/8” 14” 16”
Live load Total load Live load Total load Live load Total load
Defl� L/480 Defl� L/240 Defl� L/480 Defl� L/240 Defl� L/480 Defl� L/240
12 182 199 213
13 168 184 197
14 156 171 183
15 146 160 171
16 137 150 160
17 129 141 151
18 122 133 142
19 104 115 126 135
20 89 110 120 128
21 77 104 112 114 122
22 67 100 98 109 116
23 59 95 85 104 111
24 52 92 75 100 102 107
25 46 88 66 96 90 102
26 41 81 59 92 80 98
27 36 73 53 89 71 95
28 33 65 47 86 64 91
29 29 59 43 83 58 88
30 27 53 38 81 52 85
31 24 48 35 78 47 83
32 22 44 32 76 43 80
33 20 40 29 73 39 78
34 18 36 26 71 36 71
35 17 33 24 48 33 65
36 15 31 22 45 30 60
37 14 28 21 41 28 55
38 13 26 19 38 26 51
Clear
Joist Span
(ft�)
18” 20” 22” 24”
Live load Total load Live load Total load Live load Total load Live load Total load
Defl� L/480 Defl� L/240 Defl� L/480 Defl� L/240 Defl� L/480 Defl� L/240 Defl� L/480 Defl� L/240
12 263 263 263 263
13 243 243 243 243
14 226 226 226 226
15 211 211 211 211
16 187 198 198 198
17 186 186 186 186
18 176 176 176 176
19 166 166 166 166
20 158 158 158 158
21 150 150 150 150
22 144 144 144 144
23 137 137 137 137
24 132 132 132 132 132
25 117 126 126 126 126
26 104 122 122 122 122
27 93 117 117 117 117 117
28 83 113 105 113 113 113
29 75 109 94 109 109 109
30 68 105 85 105 105 105 105
31 61 102 77 102 95 102 102
32 56 99 70 99 87 99 99
33 51 96 64 96 79 96 96 96
34 46 93 59 93 72 93 88 93
35 43 85 54 90 66 90 80 90
36 39 78 49 88 61 88 74 88
37 36 72 45 85 56 85 68 85
38 33 66 42 82 52 83 63 83
TABLE 7
–
LDF = 1.0
P3 Floor Joist — PJI 90 With Web Stiffeners
Allowable Uniform Loads (PLF)
NOTES FOR TABLES 2, 3, 4, 5, 6, and 7
1� Live Load column limits deflection to L/480;
Total Load column limits deflection to L/240�
2� Values represent the most restrictive of simple
span or multiple span conditions�
3� Values are for I-Joists spaced at a maximum
of24” on center�
4� Tables assume a minimum end bearing length
of 1-3/4” and a minimum interior bearing length
of3-1/2”�
5� Web stiffeners are not required for the joists in
tables 2, 3, and 4� Web stiffeners are required for
all joists at each support in Table 5 and Table 7�
JOIST SIZING
1� Select desired joist depth (column)�
2� Select desired span (row)�
3� Check BOTH Live Load and Total Load columns�
4� If Live Load column is blank, Total Load capa-
city governs�
Allowable Floor Uniform Load Capacities (continued)
TABLE 6
–
LDF = 1.0
P3 Floor Joist — PJI 90
Allowable Uniform Loads (PLF)