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 Unimast Inc. Unimast Products Unimast Products - Page 15
Maximum Design Spans
| Truss Type |
TC pich |
2-3/4" Chord
Material |
4" Chord
Materia |
| Roof Trusses |
/ 12 |
24" o.c.
spacing |
48" o.c.
Spacing |
24" o.c.
Spacing |
48" o.c.
Spacing |
|
3 |
14' 11" |
11' 3" |
29' 8" |
21' 1" |
| 4 |
14' 3" |
10' 8" |
29' 5" |
21' 4" |
| 5 |
13' 0" |
10' 3" |
29' 1" |
21' 5" |
| 6 |
12' 7" |
10' 0" |
28' 9" |
21' 6" |
|
3 |
32' 0" |
17' 4" |
47' 0" |
34' 7" |
| 4 |
32' 11" |
18' 8" |
47' 4" |
35' 1" |
| 5 |
33' 1" |
19' 8" |
47' 6" |
35' 6" |
| 6 |
32' 10" |
20' 6" |
47' 6" |
35' 6" |
 |
3 |
38' 8" |
19' 2" |
58' 11" |
45' 8" |
| 4 |
42' 3" |
22' 9" |
62' 6" |
48' 6" |
| 5 |
44' 10" |
24' 5" |
65' 1" |
49' 10" |
| 6 |
44' 11"
* |
25' 10" |
68' 1" |
50' 2" |
 |
3 |
42' 4" |
19' 7" |
78' 10" |
29' 9" |
| 4 |
48' 0" |
23' 0" |
81' 8" |
52' 5" |
| 5 |
52' 1" |
26' 3" |
Not
Applicable |
Not
Applicable |
|
4 |
14' 5" |
10' 11" |
28' 0" |
20' 10" |
| 5 |
13' 1" |
10' 5" |
29' 0" |
20' 11" |
| 6 |
12' 6" |
10' 2" |
28' 8" |
21' 1" |
 |
4 |
27' 9" |
15' 11" |
39' 8" |
34' 0" |
| 5 |
29' 4" |
17' 5" |
42' 6" |
36' 0" |
| 6 |
30' 10" |
18' 6" |
44' 10" |
36' 6" |
|
4 |
30' 11" |
14' 11" |
49' 7" |
37' 6" |
| 5 |
34' 3" |
18' 5" |
55' 4" |
44' 9" |
| 6 |
35' 6" |
21' 11" |
58' 0" |
46' 6" |
|
3 |
13' 9" |
11' 1" |
24' 9" |
20' 0" |
| 4 |
14' 5" |
11' 7" |
26' 2" |
20' 1" |
| 5 |
16' 1" |
11' 11" |
26' 3" |
19' 8" |
| 6 |
17' 9" |
12' 3" |
26' 1" |
19' 6" |
|
3 |
19' 1" |
15' 3" |
34' 9" |
27' 10" |
| 4 |
19' 10" |
15' 4" |
35' 2" |
28' 0" |
| 5 |
21' 10" |
15' 2" |
34' 8" |
27' 7" |
| 6 |
22' 4" |
14' 9" |
33' 8" |
26' 9" |
|
3 |
22' 5" |
17' 10" |
40' 11" |
32' 7" |
| 4 |
22' 4" |
17' 1" |
39' 3" |
31' 2" |
| 5 |
23' 5" |
16' 3" |
37' 1" |
29' 5" |
| 6 |
23' 9" |
15' 2" |
34' 10" |
27' 6" |
|
Floor Trusses |
Depth |
2-3/4"
Chord - 16" o.c. Spacing |
2-3/4" Chord -
24" o.c. Spacing |
 |
13" |
18' 6" |
18' 2" |
| 14" |
22' 6" |
20' 6" |
| 16" |
26' 4" |
22' 9" |
Roof Truss Design Notes:
- Design Loads - 20-10-0-10
- Designs may include multiple gauge in top and bottom chords
as selected by Alpine's TrusCalc engineering software.
- * Top chord plumb cut at each end.
- 2-3/4" chord sections have top and bottom chords
laterally braced with roof and ceiling sheathing when trusses are spaced at 24" o.c.
When truses are spaced at 48" o.c, the top and bottom chords are laterally braced
with purlins at 24" o.c. spacing.
- 4" chord section having top and bottom chord laterally
braced with purlins at 24" o.c. spacing.
- Trusses designed with ASCE7-93 Wind
- 80 m.p.h. - exposure C
- residential building - 15 ft. mean roof height
- 100 miles from ocean line - interior zone
- Spans in excess of what is outlined above can be obtained
with different web patterns.
|
Floor Truss
Design Notes:
Design Loads - 40-10-0-5
2-3/4" chord section having top and
bottom chord laterally braced with floor and ceiling sheathing
Deflection limits:
Live Load - L/480
Total Load - L/360
Chase located in center of span, maximum
chase width allowed - 24 inches
|
| Trusses are designed and tested according to
the: DESIGN GUIDE FOR COLD-FORMED STEEL TRUSSES PUBLICATION RG-9518 AMERICAN IRON AND
STEEL INSTITUTE. |
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|
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