Allowable Floor Spans – Canada

Maximum Allowable Spans

The specific PJI designation needed for your application is easily determined by selecting the span needed and then by choosing the PJI that meets your span, spacing, and uniform loading criteria.

Tables 1 and 1a are for simple or multiple span applications. The use of these tables will provide maximum spans for the indicated spacings and span conditions.

To illustrate the selection of a PJI product, assume a design simple span of 15’-10” for 40/15 loading. For architectural reasons limit the Power Joist depth to 11‑7/8” and Power Joist spacing to 19.2” on center with 5/8” OSB subfloor. From the 11‑7/8” entry in Table 1, look down the 19.2” o.c. spacing column. Select PJI 40 11-7/8” Power Joist.

While any of the PJIs shown in Tables 1 and 1a may be available in a specific market area, availability of any PJI product should be verified prior to final product selection.

The allowable spans in the tables in this user guide indicate the allowable clear and multiple spans for various joist spacings under typical residential uniform floor loads (40 psf live load and 15 psf dead load) for glued-nailed systems.

Floor sheathing must be field glued to the Power Joist flanges using approved construction adhesives to achieve the PJI allowable spans.

Use of these span tables is limited to uniform load conditions and PJI floor spans shall not exceed these allowable spans. PJI Power Joist can be used for other applications such as roofs and ceilings to support line loads or concentrated loads, etc., when properly engineered. Consult EACOM by calling 1-800-221-2326.

Allowable Spans for P3 Floor Joists – Simple Span Only – Table 1 – LDF= 1.0

Maximum floor span [ft] – Glued subfloor* – On center joist spacing [in]

Live Load Dead Load Series Depth [in] 12 16 19.2 24
40 10 PJI 40 9 1/2  15′-8″  14′-9″  14′-4″  14′-3″
 “  “ 11 7/8  17′-7″ 16′-7″ 16′-0″ 16′-2″
 “  “ 14  19′-4″ 18′-0″  17′-5″ 17′-6″
 “  “ 16  21′-1″  19’6″ 18′-9″  18′-11″
 40  10 PJI 60 9 1/2  16′-2″ 15′-3″  14′-9″  14′-10″
 “  “ 11 7/8 18′-2″ 17′-1″  16′-6″  16′-8″
 “  “ 14  20′-2″ 18′-8″ 17′-11″  18′-1″
 “  “ 16 22′-0″  20′-5″  19′-6″ 19′-8″
 40  10 PJI 80 11 7/8  19′-6″ 18′-0″ 17′-5″  17′-6″
 “  “ 14  21′-8″  20′-0″ 19′-2″ 19′-4″
 “  “ 16  23′-7″  21′-10″  20′-10″  21′-0″
 “  “ 18  25′-4″ 23′-5″  22′-5″  22′-6″
 “  “ 20  27′-1″  25′-0″  23′-11″ 24′–0″
 “  “ 22  28′-9″  26′-7″  25′-4″ 25′-6″
 “  “ 24  30′-5″  28′-0″ 26′-9″  26′-11″

*For other type floor assemblies, please contact EACOM at www.eacom.ca.

 

Allowable Spans for P3 Floor Joists – Multiple Span Only – Table 1A – LDF= 1.0

Maximum floor span [ft] – Glued subfloor* – On center joist spacing [in]

Live Load Dead Load Series Depth [in] 12 16 19.2 24
40 10 PJI 40 9 1/2 16′-11  16′-0″  15′-6″  14′-10″
 “  “ 11 7/8  19′-3″ 17′-11″ 17′-4″  17′-0″
 “  “ 14  21′-5″ 19′-10″  19′-0″ 18′-8″
 “  “ 16 23′-3″ 21′-7″  20′-8″  20′-1″
 40  10 PJI 60 9 1/2  17′-6″ 16′-6″ 16′-0″  16′-1″
 “  “ 11 7/8 20′-1″  18′-7″  17′-11″  18′-0″
 “  “ 14  22′-4″ 20′-8″ 19′-10″  20′-0″
 “  “ 16  24′-4″  22′-7″  21′-7″  21′-9″
 40  10 PJI 80 11 7/8  21′-7″ 20′-0″ 19′-1″  19′-3″
 “  “ 14  24′-0″  22′-2″  21′-3″  21′-4″
 “  “ 16  26′-2″  24′-2″  23′-1″ 23′-3″
 “  “ 18  28′-1″ 26′-0″  24′-10″  24′-11″
 “  “ 20 30′-0″ 27′-9″ 26′-6″  26′-8″
 “  “ 22  31′-10″ 29′-5″ 28′-1″ 28′-3″
 “  “ 24  34′-3″  31′-1″  29′-8″ 29′-9″

*For other type floor assemblies, please contact EACOM at www.eacom.ca.

NOTES:

  1. Design is to CSA O86S1-05 and CCMC vibration concluding report dated September 4, 1997.
  2. Web stiffeners are not required for Power Joist up to 16” deep. Joists 18” and deeper require stiffeners at each support.
  3. Use in dry service conditions only.
  4. Provide lateral support at points of bearing to prevent twisting of joists.
  5. Uniform load deflection criteria is L/360 on live load and L/240 on total load calculated using bare joist properties only and is L/480 on live load based on glued subfloor.
  6. Elastomeric adhesives for gluing of the subfloor shall conform to CGSB Standard CAN-CGSB-71.26-M88
  7. Minimum bearing length to be 1-3/4”.
  8. Vibration spans are based on 19/32” OSB or 5/8” Canadian Softwood Plywood for joist spacing of 12” to 19.2” and on 23/32” OSB or 3/4” Canadian Softwood Plywood for joists spaced at 24” o/c. No ceiling, concrete topping, or bridging elements.
  9. Spans listed are clear distances between supports.

 

P3 Floor Joist – PJI 40 – Allowable Uniform Loads [PLF] – Table 2 – LDF= 1.0
9/12″ 11 7/8″ 14″ 16″
Clear Joist Span [ft] Unfactored*
Live L/480
 Unfactored*
Live L/360
Total L/240  Factored Total Load Unfactored*
Live L/480
 Unfactored*
Live L/360
Total L/240  Factored Total Load  Unfactored*
Live L/480
Unfactored*
Live L/360
Total L/240  Factored Total Load  Unfactored*
Live L/480
 Unfactored*
Live L/360
Total L/240 Factored Total Load
 8  301  344  419  419  419
 9  224  299  306  357  374  374  374
 10  170  227  276  274  337  337 337
 11  132  176  252  215 287  308 301  308  308
 12  104  139  209 231 171  228  282  241  282  282
13  84  112  168 208  138  184  261  195 260  261 258  261
 14 68  91  137  180  113  151 226 233  160 214  243  213  243
15  56  75  113  157  93  125  187  203  133  178  227  177  227
 16  47  62  94  138 78  104  157  179  112  149  213  149 199  213
17  39  52  79  122  66  88  132  159  94 126 189  191  126  168  201
 18  33  45  67 109  56  75 112  142  80  107  161  171 108  144  190
 19  28  38  57 98  48  64 96 127  69  92  139  153  93  124  178
 20  24  33 49 89  41  55  83  115  60  80  120  138  80  107 161
 21 21  28  43  80  36 48  72  104  52  69 104  126  70  94 141  146
 22  31  42 63  95  45  61  91 115  61 82  123  133
 23  28  37 56  87  40  54  81  105  54  72  109  122
 24  24  33  49 80  35  47  71  96 48  64  96  112
 25  22  29  44 74  31  42  63  89  43  57  86  103
26  19  26  39  68  28  37  56 82 38  51  76  95
 27  25  34  51 76 34  46 69  88
 28  22  30 45  71  31  41 62  82
 29  20  27  41  66  28  37 56  77
 30  18  25 37  62  25  33  50  72
 31 17  22  34 58 23  30  46  67
*Unfactored load based on deflection.

 

P3 Floor Joist – PJI 60 – Allowable Uniform Loads [PLF] – Table 3 – LDF= 1.0
9/12″ 11 7/8″ 14″ 16″
Clear Joist Span [ft] Unfactored*
Live L/480
 Unfactored*
LiveL/360
Total L/240  Factored Total Load  Unfactored*
Live L/480
 Unfactored*
Live L/360
Total L/240  Factored Total Load  Unfactored*
Live L/480
Unfactored*
Live L/360
Total L/240  Factored Total Load  Unfactored*
Live L/480
 Unfactored*
Live L/360
Total L/240 Factored Total Load
 8  344  419 419  419
 9 258  306  374  374  374
 10  197  263  276  316  337  337  337
 11  154  205  252  249  308  308  308
 12  122  163  231  199 265  282  280  282  282
13  98  131 197  213 161  215  261  228  261  261
 14  80  107  161  198  132  177  243  188  243  243
15  66  88  133 185  110  146 220  227  157  209  227 208  227
 16  55  74  111 174  92 123  184  213  132  176  213  176  213
17  46  62  96  164  78  104  156  201  112  149  201  149 199  201
 18  39  53  79  151  66  88  133  190  96  128  190  128  171  190
 19  34  45  68  136  57  76  114 176  82  110 165  180  110  147 180
 20  29  39  59  123  49  66  99 159  71  95  143  171  96  128  171
 21  25  34 51 111  43 57  86  144  62  83  125  163  84  112  163
 22  37 50  75  132 54  73 109  156 74  98 148  156
 23  33 44  66 120  48  64  96  145  65  87  130  149
 24  29  39  59  111  42  57  85  133  57  77  115  143
 25 26  35 52  102  38  50  76  123  51  68  103  137
26  23 31 46  94  34  45  68  114  46  61  92  132
 27  30 40  61  105  41  55  82  122
 28  27  36  55 98  37  49  74  114
 29 24  33  49  91  33  45  67  106
 30 22  30  45  85  30 40  61  99
 31  20  27  41  80  27  37  55  93
*Unfactored load based on deflection.

 

P3 Floor Joist – PJI 80 – Allowable Uniform Loads [PLF] – Table 4 – LDF= 1.0
9/12″ 11 7/8″ 14″
Clear Joist Span [ft]  Unfactored*
Live L/480
 Unfactored*
LiveL/360
Total L/240  Factored Total Load  Unfactored*
Live L/480
 Unfactored*
Live L/360
Total L/240  Factored Total Load Unfactored*
Live L/480
 Unfactored*
Live L/360
Total L/240  Factored Total Load
 8  420  459  487
 9  375 410  434
 10 338  370  392
 11  308  337  357
 12  256  283  310  328
13  210  262  286 303
 14  173 231 243  243  266 282
15  145 193  227  204  249 264
 16  122  163  213  172 230  234  227  247
 17  103  138  201  147 196  220  194 233
 18  88  118  177  190  126  168  208  167 220
19 76  102  153  180  109  145  197 145 193 209
20  66  88  133  171  95  126  187 126  168  199
21  58  77  116  163 83 111 166  179  110 147  189
22  51  68  102 156  73  97 146  171  97  130  181
23  45  60 90 149  64 86  129  163  86  115 173  173
 24  39  53  79 143  57  76  115  156  76  102  153 166
 25  35 47  71  137 51 68  102  150  68  91 137 159
 26 31 42  63  132  45  61  91  145  61  82  123 153
 27 41 55  82  139 55  73 110 148
 28 37  49  74  134  49  66  99 142
 29 33  44 67  130  45  60  90 137
 30  30  40 61  121  41 54  82  133
 31  27  37  55  114  37  49  74  129
*Unfactored load based on deflection.

 

P3 Floor Joist – PJI 80 with Web Stiffeners – Allowable Uniform Loads [PLF] – Table 5 – LDF= 1.0
18″ 20″ 22″ 24″
Clear Joist Span [ft]  Unfactored*
Live L/480
 Unfactored*
Live L/360
Total L/240  Factored Total Load  Unfactored*
Live L/480
Unfactored*
Live L/360
Total L/240  Factored Total Load  Unfactored*
Live L/480
 Unfactored*
Live L/360
Total L/240  Factored Total Load Unfactored*
Live L/480
Unfactored*
Live L/360
Total L/240 Factored Total Load
 8  601  601  601  601
 9  536  536  536 536
 10 484  484 484  484
 11 441  441  441  441
 12  405  405  405  405
13  375  375  375  375
 14  348  348  348  348
15  326  326  326  326
 16  284  306  306 306  306
17  244  288  288  288  288
 18  211 272  260  272  272  272
 19 183  244  258  226  258  258  258
 20 160 213  245  198  245  239  245  245
 21  140  187  234  174  232  234 211  234  234
 22  124  165  223  154  205  223  187  223 222  223
 23 110  146 214  136  182  214  166  214  198  214
 24  97  130  195  205  122  162  205  148 197  205  177  205
 25  87 116  175  197  109  145  197  133  177  197  158 197
26  78  104  157  189  98  130  189  119  159  189  143  189
 27  70  94  141  182  88  117 176  182  107  143  182 129 172  182
 28  63  85  127 176  79  106 159  176  97 130  176 116 155  176
 29  57  77  115  170  72  96  144  170  88  118  170  106 141  170
 30 52 70  105  160  65  87  131  164  80 107  161  164  96 129  164
 31 47 63  95  150  60 80  120  159  73  98  147 159  88 117  159
 *Unfactored load based on deflection.

 

NOTES FOR TABLES 2,3,4, and 5:

  1. Clear span is the distance between the face of the supports.
  2. The load values are for standard term load duration and dry service conditions only. The dead load must not exceed the live load.
  3. The load values represent the worst case of simple span or multiple span single member applications.
  4. Design of continuous spans is based on the longest span. The shortest span must not be less than 50% of the longest span.
  5. Provide continuous lateral support for top flange. Provide lateral support at points of bearing to prevent twisting of joist.
  6. The unfactored load columns are based on deflection only. The factored load column is based on strength only. Unfactored live load (either L/480 or L/360), unfactored total load and factored load must be checked. Where the unfactored load column is blank, the factored load column governs.
  7. Provide 1-3/4” bearing at end supports and 3-1/2” bearing at interior support minimum.
  8. Web stiffeners are not required for the joists in tables 2,3 and 4.
  9. Web stiffeners are required for all joists at each support in Table 5.
  10. The loads have been calculated in accordance with CSA O86S1-05.
  11. Vibration is not included in the design criteria for this table.