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Boise Cascade Engineered Wood Products
Southern Engineered Wood Products Specifier Guide
9 1/2 & 11 7/8 inch BCI 45s Series Joists Roof Span Table
Southern Engineered Wood Products Specifier Guide
Southern EWP
Specifier Guide - 115% and 125%
BCI 45s Series Joists - 1 3/4" Flange Width
Maximum clear span in feet and inches, based on horizontal spans.
| Live Load/ Dead Load |
9 1/2" BCI 45s | 11 7/8" BCI 45s | ||||||
|---|---|---|---|---|---|---|---|---|
| PSF | Less than 4/12 |
4/12 to 8/12 |
8/12 to 12/12 |
Less than 4/12 |
4/12 to 8/12 |
8/12 to 12/12 |
||
| 12" O.C. |
Non- Snow (125%) |
20/10 | 25'-2" |
23'-8" |
22'-0" |
30'-1" |
28'-4" |
26'-4" |
| 20/15 | 23'-10" |
22'-4" |
20'-7" |
28'-6" |
26'-9" |
24'-8" |
||
| 20/20 | 22'-8" |
21'-3" |
19'-6" |
27'-2" |
25'-5" |
23'-5" |
||
| Snow (115%) |
25/10 | 23'-10" |
22'-7" |
21'-0" |
28'-7" |
27'-0" |
25'-1" |
|
| 25/15 | 22'-9" |
21'-5" |
19'-10" |
27'-3" |
25'-8" |
23'-9" |
||
| 30/10 | 22'-10" |
21'-7" |
20'-2" |
27'-4" |
25'-10" |
24'-1" |
||
| 30/15 | 21'-10" |
20'-8" |
19'-2" |
26'-2" |
24'-8" |
22'-11" |
||
| 40/10 | 20'-9" |
19'-11" |
18'-9" |
24'-10" |
23'-10" |
22'-6" |
||
| 40/15 | 20'-5" |
19'-4" |
18'-0" |
24'-6" |
23'-2" |
21'-7" |
||
| 50/10 | 19'-3" |
18'-5" |
17'-6" |
23'-0" |
22'-1" |
20'-11" |
||
| 50/15 | 19'-3" |
18'-4" |
17'-1" |
23'-0" |
21'-11" |
20'-6" |
||
| 16" O.C. |
Non- Snow (125%) |
20/10 | 22'-9" |
21'-6" |
19'-11" |
27'-3" |
25'-9" |
23'-10" |
| 20/15 | 21'-7" |
20'-3" |
18'-8" |
25'-10" |
24'-3" |
22'-5" |
||
| 20/20 | 20'-7" |
19'-3" |
17'-8" |
24'-8" |
23'-1" |
21'-2" |
||
| Snow (115%) |
25/10 | 21'-7" |
20'-5" |
19'-0" |
25'-11" |
24'-6" |
22'-9" |
|
| 25/15 | 20'-7" |
19'-5" |
18'-0" |
24'-8" |
23'-3" |
21'-6" |
||
| 30/10 | 20'-8" |
19'-7" |
18'-3" |
24'-9" |
23'-5" |
21'-10" |
||
| 30/15 | 19'-10" |
18'-8" |
17'-4" |
23'-9" |
22'-5" |
20'-9" |
||
| 40/10 | 18'-10" |
18'-0" |
17'-0" |
22'-6" |
21'-7" |
20'-5" |
||
| 40/15 | 18'-6" |
17'-6" |
16'-4" |
22'-2" |
21'-0" |
19'-6" |
||
| 50/10 | 17'-5" |
16'-8" |
15'-10" |
20'-10" |
20'-0" |
19'-0" |
||
| 50/15 | 17'-5" |
16'-7" |
15'-6" |
20'-10" |
19'-10" |
18'-7" |
||
| 19.2" O.C. |
Non- Snow (125%) |
20/10 | 21'-5" |
20'-2" |
18'-9" |
25'-7" |
24'-2" |
22'-5" |
| 20/15 | 20'-3" |
19'-0" |
17'-7" |
24'-3" |
22'-9" |
21'-0" |
||
| 20/20 | 19'-4" |
18'-1" |
16'-8" |
23'-2" |
21'-8" |
19'-11" |
||
| Snow (115%) |
25/10 | 20'-4" |
19'-2" |
17'-10" |
24'-4" |
23'-0" |
21'-5" |
|
| 25/15 | 19'-4" |
18'-3" |
16'-11" |
23'-2" |
21'-10" |
20'-3" |
||
| 30/10 | 19'-5" |
18'-5" |
17'-2" |
23'-3" |
22'-0" |
20'-6" |
||
| 30/15 | 18'-7" |
17'-7" |
16'-3" |
22'-3" |
21'-0" |
19'-6" |
||
| 40/10 | 17'-8" |
16'-11" |
16'-0" |
21'-2" |
20'-3" |
19'-2" |
||
| 40/15 | 17'-4" |
16'-5" |
15'-4" |
20'-10" |
19'-8" |
18'-4" |
||
| 50/10 | 16'-4" |
15'-8" |
14'-10" |
19'-7" |
18'-9" |
17'-10" |
||
| 50/15 | 15'-8" |
15'-2" |
14'-6" |
18'-9" |
18'-1" |
17'-3" |
||
| 24" O.C. |
Non- Snow (125%) |
20/10 | 19'-10" |
18'-8" |
17'-4" |
23'-9" |
22'-5" |
20'-9" |
| 20/15 | 18'-9" |
17'-7" |
16'-3" |
22'-5" |
21'-1" |
19'-6" |
||
| 20/20 | 17'-10" |
16'-9" |
15'-5" |
21'-5" |
20'-1" |
18'-5" |
||
| Snow (115%) |
25/10 | 18'-10" |
17'-9" |
16'-7" |
22'-6" |
21'-3" |
19'-10" |
|
| 25/15 | 17'-11" |
16'-10" |
15'-8" |
21'-6" |
20'-3" |
18'-9" |
||
| 30/10 | 17'-11" |
17'-0" |
15'-11" |
21'-6" |
20'-5" |
19'-0" |
||
| 30/15 | 17'-2" |
16'-3" |
15'-1" |
20'-6" |
19'-5" |
18'-1" |
||
| 40/10 | 16'-4" |
15'-8" |
14'-10" |
19'-6" |
18'-9" |
17'-9" |
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| 40/15 | 14'-9" |
14'-2" |
13'-5" |
17'-8" |
17'-0" |
16'-1" |
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| 50/10 | 13'-7" |
13'-3" |
12'-9" |
16'-3" |
15'-10" |
15'-4" |
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| 50/15 | 12'-5" |
12'-0" |
11'-6" |
14'-11" |
14'-5" |
13'-9" |
||
- Table values are limited by shear, moment, Total Load deflection equal to L/180 and Live Load deflection equal to L/240. Check the local building code for other deflection limits that may apply.
- Allowable moment has been increased by a repetitive member factor for joist spacings of 24 inches or less.
- Slope roof joists at least 1/4" over 12" to minimize ponding.
- Table values represent the most restrictive of simple or multiple span applications.
- This table was designed to apply to a broad range of applications. It may be possible to exceed the limitations of this table by analyzing a specific application with the BC CALC software.