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  Willamette StrucJoist SJ-32-42-55 StrucJoist SJ-32-42-55 - Page 7
TABLE VIII
Roof Span Tables (8/12 & Less)
| |
SJ-32
Roof Span |
SJ-42
Roof Span |
SJ-55
Roof Span |
| |
Load in
PSF |
9-1/2"
|
11-7/8"
|
14"
|
16"
|
9-1/2"
|
11-7/8"
|
14"
|
16"
|
11-7/8"
|
14"
|
16"
|
| Live Load |
Dead Load |
| 12"
o.c. |
Non
Snow 125% |
20 |
10 |
26'- 4" |
31'- 5" |
38'-1" |
42'- 3" |
31'- 2" |
37'- 2" |
42'- 4" |
46'-11" |
38'- 7" |
43'-11" |
48'- 8" |
| 20 |
15 |
24'- 8" |
29'- 5" |
35'- 8" |
39'- 7" |
29'- 2" |
34'- 9" |
39'- 7" |
43'-11" |
36'- 2" |
41'-1" |
45'- 7" |
| 20 |
20 |
23'- 4" |
27'-10" |
33'- 9" |
37'- 5" |
27'- 7" |
32'-11" |
37'- 5" |
41'-6" |
34'- 2" |
38'-10" |
43'-1" |
| Snow
115% |
25 |
15 |
22'- 9" |
26'- 5" |
32'-11" |
36'- 7" |
26'-11" |
32'-1" |
36'- 6" |
40'- 6" |
33'- 4" |
37'-11" |
42'-1" |
| 25 |
20 |
21'-6" |
24'- 8" |
31'-6" |
34'-11" |
25'- 9" |
30'- 8" |
34'-11" |
38'- 9" |
31'-11" |
36'- 3" |
40'- 3" |
| 30 |
15 |
21'-8" |
25'-0" |
31'-8"
|
35'-2" |
25'-11" |
30'-11" |
35'-
2" |
39'-
0" |
32'-
2" |
36'-
6" |
40'-
6" |
| 30 |
20 |
20'-5" |
23'-6" |
30'-5" |
33'-10" |
24'-10" |
29'-8" |
33'-10" |
37'-
6" |
30'-10" |
35'-1"
|
38'-11" |
| 40 |
20 |
18'- 8" |
21'-6" |
28'- 9" |
31'-6" |
23'- 5" |
28'- 0" |
31'-11" |
35'- 4" |
29'-1" |
33'-1" |
36'- 5" |
| 50 |
20 |
17'- 4" |
19'-11" |
27'- 0" |
29'- 2" |
22'- 4" |
26'- 8" |
30'- 4" |
31'-6" |
27'- 8" |
31'-6" |
31'-6" |
| 16"
o.c. |
Non
Snow 125% |
20 |
10 |
23'-10" |
28'- 6" |
34'- 6" |
38'- 4" |
28'- 3" |
33'- 8" |
38'- 4" |
42'- 6" |
35'- 0" |
39'-10" |
44'- 2" |
| 20 |
15 |
22'- 4" |
26'- 7" |
32'- 4" |
35'-11" |
26'- 5" |
31'- 6" |
35'-11" |
39'- 9" |
32'- 9" |
37'- 3" |
41'-4" |
| 20 |
20 |
21'-1" |
24'-8" |
30'- 7" |
33'-11" |
25'- 0" |
29'-10" |
33'-11" |
37'- 8" |
31'-0" |
35'- 3" |
39'-1" |
| Snow
115% |
25 |
15 |
19'- 9" |
22'- 9" |
29'-10" |
33'-1" |
24'- 4" |
29'-1" |
33'-1" |
36'- 8" |
30'- 3" |
34'- 5" |
38'- 2" |
| 25 |
20 |
18'- 6" |
21'-3" |
28'- 6" |
31'-2" |
23'- 3" |
27'-10" |
31'-8" |
35'-1" |
28'-11" |
32'-11" |
35'- 8" |
| 30 |
15 |
18'-8" |
21'-6" |
28'-9" |
31'-6" |
23'-5" |
28'-
0" |
31'-11"
|
35'-
4" |
29'-1"
|
33'-1"
|
36'-
5" |
| 30 |
20 |
17'-7" |
20'-2" |
27'-4" |
29'-7" |
22'-6" |
26'-11"
|
30'-
7" |
32'-
5" |
28'-
0" |
31'-10"
|
32'-
5" |
| 40 |
20 |
16'-1" |
18'- 6" |
25'- 0" |
25'- 4" |
21'- 3" |
25'- 4" |
27'- 4" |
27'- 4" |
26'- 5" |
27'- 4" |
27'- 4" |
| 50 |
20 |
14'-11" |
17'-1" |
21'-11" |
21'-11" |
20'- 2" |
23'- 7" |
23'- 7" |
23'- 7" |
23'- 7" |
23'- 7" |
23'- 7" |
| 19.2"
o.c. |
Non
Snow 125% |
20 |
10 |
22'- 5" |
26'- 3" |
32'- 5" |
36'- 0" |
26'- 6" |
31'-8" |
36'- 0" |
39'-11" |
32'-11" |
37'- 5" |
41'-6" |
| 20 |
15 |
20'-11" |
24'- 2" |
30'- 4" |
33'- 9" |
24'-10" |
29'- 7" |
33'- 8" |
37'- 4" |
30'- 9" |
35'- 0" |
38'-10" |
| 20 |
20 |
19'- 6" |
22'- 5" |
28'- 9" |
31'-11" |
23'- 5" |
28'- 0" |
31'-10" |
35'- 4" |
29'-1" |
33'-1" |
35'- 6" |
| Snow
115% |
25 |
15 |
18'- 0" |
20'- 8" |
28'- 0" |
30'- 4" |
22'-10" |
27'- 4" |
31'-1" |
33'-11" |
28'- 5" |
32'- 4" |
33'-11" |
| 25 |
20 |
16'-10" |
19'-4" |
26'- 2" |
27'- 7" |
21'-10" |
26'-1" |
29'- 9" |
29'- 9" |
27'- 2" |
29'- 9" |
29'- 9" |
| 30 |
15 |
17'-0"
|
19'-
6" |
26'-6" |
28'-2" |
22'-0" |
26'-
4" |
29'-11" |
30'-
4" |
27'-
4" |
30'-
4" |
30'-
4" |
| 30 |
20 |
16'-0" |
18'-4"
|
24'-11" |
25'-0" |
21'-2"
|
25'-3"
|
27'-
0" |
27'-
0" |
26'-
3" |
27'-
0" |
27'-
0" |
| 40 |
20 |
14'- 7" |
16'- 9" |
21'-1" |
21'-1" |
19'- 7" |
22'- 9" |
22'- 9" |
22'- 9" |
22'- 9" |
22'- 9" |
22'- 9" |
| 50 |
20 |
13'- 6" |
15'- 6" |
18'-2" |
18'-2" |
16"-11" |
19'- 8" |
19'- 8" |
19'- 8" |
19'- 8" |
19'- 8" |
19'- 8" |
| 24"
o.c. |
Non
Snow 125% |
20 |
10 |
20'- 3" |
23'- 5" |
30'-1" |
33'- 5" |
24'- 7" |
29'- 4" |
33'- 4" |
37'- 0" |
30'- 6" |
34'- 8" |
38'- 3" |
| 20 |
15 |
18'- 8" |
21'-7" |
28'-1" |
30'- 2" |
23'- 0" |
27'- 5" |
31'-3" |
32'- 7' |
28'- 6" |
32'- 5" |
32'- 7" |
| 20 |
20 |
17'- 4" |
20'- 0" |
26'- 4" |
26'- 4" |
21'-8" |
25'-11" |
28'- 5" |
28'- 5" |
27'- 0" |
28'- 5" |
28'- 5" |
| Snow
115% |
25 |
15 |
16'- 0" |
18'- 5" |
24'-11" |
25'-1" |
21'-2" |
25'- 3" |
27'-1" |
27'-1" |
26'- 4" |
27'-1" |
27'-1" |
| 25 |
20 |
14'-11" |
17'- 2" |
22'- 0" |
22'- 0" |
20'- 3" |
23'- 9" |
23'- 9" |
23'- 9" |
23'- 9" |
23'- 9" |
23'- 9" |
| 30 |
15 |
15'-1"
|
17'-4"
|
22'--6"
|
22'-
6" |
20'
-4" |
24'-
3" |
24'-
3" |
24'-
3" |
24'-
3" |
24'-
3" |
24'-
3" |
| 30 |
20 |
14'-
2" |
16'-4"
|
20'-0"
|
20'-0" |
18'-
7" |
21'-
6" |
21'-
6" |
21'-
6" |
21'-
6" |
21'-
6" |
21'-
6" |
| 40 |
20 |
13'- 0" |
14'-11" |
16'-10" |
16'-10" |
15'- 8" |
18'-2" |
18'-2" |
18'- 2" |
18'- 2" |
18'- 2" |
18'- 2" |
| 50 |
20 |
12'- 0" |
13'- 9" |
14'- 6" |
14'- 6" |
13'- 6" |
15'- 8" |
15'- 8" |
15'- 8" |
15'- 8" |
15'- 8" |
15'- 8" |
Roof joists to be sloped a minimum of
1/4" per foot and maximum of 8" per foot. Reduce spans 3'-8" for slopes
greater than 8:12. Maximum slope allowed is 12:12.
Spans shown are for simple spans only.
Maximum deflection is limited to L/180 under
total load, and L/240 under live load.
Live load reductions have been applied in
accordance with standard engineering practices. Verify local building code requirements.
Spans are based on horizontal clear distance
between supports.
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