Technical Specifications

P. 28
Allowable Roof Uniform Load Capacities (continued)
TABLE 16
–
LDF = 1.15
P3 Joist — PJI 60
Allowable uniform loads (PLF) Roof
Clear
Joist
Span
(ft�)
9-1/2” 11-7/8” 14” 16”
Live
Load
Total
Load
Live
Load
Total
Load
Live
Load
Total
Load
Live
Load
Total
Load
Defl�
L/240
Snow
115%
Non-
Snow
125%
Defl�
L/240
Snow
115%
Non-
Snow
125%
Defl�
L/240
Snow
115%
Non-
Snow
125%
Defl�
L/240
Snow
115%
Non-
Snow
125%
6 323 351 374 407 374 407 374 407
7 278 302 322 336 322 336 322 336
8 244 265 282 295 282 295 282 295
9 217 236 251 262 251 262 251 262
10 196 213 227 237 227 237 227 237
11 178 194 206 215 206 215 206 215
12 164 178 189 198 189 198 189 198
13 151 164 175 183 175 183 175 183
14 140 153 163 170 163 170 163 170
15 131 143 152 158 152 158 152 158
16 119 129 142 149 142 149 142 149
17 101 106 115 134 140 134 140 134 140
18 85 94 102 126 132 127 132 127 132
19 73 85 92 113 123 120 125 120 125
20 62 77 83 102 111 114 119 114 119
21 54 69 72 92 93 101 109 113 109 113
22 47 63 63 81 85 92 104 108 104 108
23 41 55 55 71 77 84 95 103 99 104
24 36 48 48 62 71 77 87 95 95 99
25 32 43 43 55 66 71 81 88 91 95
26 29 38 38 49 61 65 72 74 81 87 92
27 26 34 34 44 56 58 65 69 75 81 88
28 31 31 39 52 52 58 64 70 75 82
29 28 28 35 47 47 52 60 65 70 77
30 32 43 43 47 56 61 65 66 72
31 29 39 39 43 52 57 59 62 67
32 26 35 35 39 49 52 53 58 63
33 32 32 36 46 47 49 54 59
34 29 29 32 43 43 44 51 56
NOTES
1� Roof joists or rafters must be sloped
a minimum of 1/4” in 12”�
2� Live Load column limits deflection
to L/240; Total Load column limits def-
lec tion to L/180� Cathedral ceilings or
sheet rocked rafters may require stiffer
performance or additional design�
3� Values represent the most restric-
tive of simple span or multiple span
conditions�
4� Values are for P3 Joist spaced at a
maximum of 24” on center�
5� Table assumes a minimum end bearing
length of 1-3/4” and a minimum interior
bearing length of 3-1/2”�
6� Web stiffeners are not required
except when the joist hangers do not
pro videlateral support for the top flange
of the P3 Joist� Web stiffeners are
required at birdsmouth cuts and when
required by hanger manufacturers for
properconnections�
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
capacity governs�