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Boise Cascade Engineered Wood Products
Western Engineered Wood Products Specifier Guide
14 & 16 inch BCI 450 Series Roof Span
Western Engineered Wood Products Specifier Guide
Western EWP
Specifier Guide - 115% and 125%
BCI 450 Series Joists - 1 3/4" Flange Width
Maximum clear span in feet and inches, based on horizontal spans.
| Live Load/ Dead Load |
14" BCI 400 | 16" BCI 400 | ||||||
|---|---|---|---|---|---|---|---|---|
| PSF | Less than 4/12 |
4/12 to 8/12 |
Greater than 8/12 |
Less than 4/12 |
4/12 to 8/12 |
Greater than 8/12 |
||
| 12" O.C. |
Non- Snow (125%) |
20/10 | 32'-9" |
30'-11" |
27'-1" |
35'-0" |
34'-4" |
30'-0" |
| 20/15 | 31'-0" |
28'-11" |
25'-2" |
34'-5" |
32'-1" |
27'-11" |
||
| 20/20 | 29'-7" |
27'-4" |
23'-9" |
32'-10" |
30'-4" |
26'-4" |
||
| Snow (115%) |
25/10 | 31'-1" |
28'-1" |
25'-2" |
34'-6" |
31'-2" |
27'-11" |
|
| 25/15 | 29'-8" |
26'-8" |
23'-8" |
32'-11" |
29'-8" |
26'-4" |
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| 30/10 | 29'-9" |
26'-11" |
24'-5" |
33'-0" |
29'-11" |
27'-1" |
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| 30/15 | 28'-6" |
25'-9" |
23'-1" |
31'-6" |
28'-7" |
26'-8" |
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| 40/10 | 27'-1" |
24'-10" |
23'-2" |
30'-0" |
27'-6" |
25'-9" |
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| 40/15 | 26'-4" |
24'-1" |
22'-1" |
28'-6" |
26'-9" |
24'-7" |
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| 50/10 | 25'-1" |
23'-0" |
22'-2" |
27'-4" |
25'-6" |
24'-8" |
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| 50/15 | 24'-3" |
22'-10" |
21'-3" |
26'-3" |
25'-4" |
23'-7" |
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| 16" O.C. |
Non- Snow (125%) |
20/10 | 29'-8" |
28'-0" |
24'-6" |
32'-11" |
31'-1" |
27'-3" |
| 20/15 | 28'-1" |
26'-3" |
22'-10" |
31'-2" |
29'-1" |
25'-4" |
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| 20/20 | 26'-10" |
24'-10" |
21'-6" |
29'-9" |
27'-6" |
23'-11" |
||
| Snow (115%) |
25/10 | 28'-2" |
25'-6" |
22'-9" |
30'-11" |
28'-3" |
25'-3" |
|
| 25/15 | 26'-8" |
24'-2" |
21'-6" |
28'-11" |
26'-10" |
23'-10" |
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| 30/10 | 26'-9" |
24'-5" |
22'-2" |
29'-0" |
27'-1" |
24'-7" |
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| 30/15 | 25'-2" |
23'-4" |
20'-11" |
27'-3" |
25'-10" |
23'-3" |
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| 40/10 | 24'-0" |
22'-6" |
21'-0" |
25'-11" |
24'-11" |
23'-4" |
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| 40/15 | 22'-10" |
21'-10" |
20'-1" |
24'-8" |
24'-2" |
22'-3" |
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| 50/10 | 21'-11" |
20'-10" |
20'-1" |
23'-8" |
23'-1" |
22'-4" |
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| 50/15 | 21'-0" |
20'-8" |
19'-3" |
22'-9" |
22'-4" |
21'-5" |
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| 19.2" O.C. |
Non- Snow (125%) |
20/10 | 27'-11" |
26'-4" |
23'-1" |
31'-0" |
29'-3" |
25'-7" |
| 20/15 | 26'-5" |
24'-8" |
21'-5" |
29'-4" |
27'-4" |
23'-10" |
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| 20/20 | 25'-2" |
23'-4" |
20'-2" |
27'-5" |
25'-10" |
22'-5" |
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| Snow (115%) |
25/10 | 26'-1" |
23'-11" |
21'-5" |
28'-3" |
26'-7" |
23'-9" |
|
| 25/15 | 24'-4" |
22'-9" |
20'-2" |
26'-4" |
25'-3" |
22'-5" |
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| 30/10 | 24'-5" |
22'-11" |
20'-10" |
26'-5" |
25'-5" |
23'-1" |
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| 30/15 | 23'-0" |
21'-11" |
19'-8" |
24'-10" |
24'-3" |
21'-10" |
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| 40/10 | 21'-10" |
21'-1" |
19'-9" |
23'-8" |
23'-4" |
21'-11" |
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| 40/15 | 20'-10" |
20'-5" |
18'-10" |
22'-6" |
22'-1" |
20'-11" |
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| 50/10 | 20'-0" |
19'-6" |
18'-11" |
21'-7" |
21'-4" |
21'-0" |
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| 50/15 | 19'-2" |
18'-10" |
18'-1" |
20'-9" |
20'-5" |
20'-1" |
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| 24" O.C. |
Non- Snow (125%) |
20/10 | 25'-10" |
24'-5" |
21'-4" |
28'-5" |
27'-1" |
23'-8" |
| 20/15 | 24'-3" |
22'-10" |
19'-10" |
26'-3" |
25'-4" |
22'-1" |
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| 20/20 | 22'-7" |
21'-7" |
18'-8" |
24'-6" |
23'-11" |
20'-9" |
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| Snow (115%) |
25/10 | 23'-4" |
22'-2" |
19'-10" |
25'-3" |
24'-7" |
22'-0" |
|
| 25/15 | 21'-9" |
21'-1" |
18'-8" |
23'-7" |
22'-11" |
20'-9" |
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| 30/10 | 21'-10" |
21'-3" |
19'-3" |
23'-8" |
23'-3" |
21'-5" |
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| 30/15 | 20'-6" |
20'-1" |
18'-3" |
22'-3" |
21'-8" |
20'-3" |
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| 40/10 | 19'-6" |
19'-3" |
18'-3" |
21'-2" |
20'-10" |
20'-4" |
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| 40/15 | 18'-7" |
18'-3" |
17'-5" |
20'-1" |
19'-9" |
19'-4" |
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| 50/10 | 17'-10" |
17'-8" |
17'-6" |
19'-4" |
18'-10" |
19'-5" |
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| 50/15 | 17'-1" |
16'-10" |
16'-9" |
17'-9" |
17'-2" |
18'-7" |
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ROOF SPAN TABLE NOTES
- Maximum deflection is limited to L/180 at total load, L/240 at live load.
- Slope roof joists at least 1/4" over 12" to minimize ponding.
- Reductions in live loadings have been applied in accordance with 1994 UBC section 1605. Check to be sure local building codes allow these reductions.
- Maximum slope is limited to 12/12 for use of these tables.
- Tables are based on a simple span.
- For other loads, joist series or on-center spacings, contact your Boise Cascade supplier.
- Span tables are based on shear values for minimum bearing lengths without web stiffeners for BCI depths of 16 inch and less. See BC CALC software for higher shear values using web stiffeners or wider bearing lengths.