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Where speed meets strength.

Open Joistâ„¢Span Charts

· 9-1/4" Truss Depth
· 11-7/8" Truss Depth
· 14" Truss Depth
· 16" Truss Depth
· 18" Truss Depth
· 20" Truss Depth


9-1/4" Truss Depth*

 9-1/4" Depth Maximum Live Load Deflection (L/360 & L/480, 1-1/2" Minimum Bearing Each End)

Chord* Size

Chord* Grade
   Loading (PSF)
      12" o.c.
      16" o.c.
    19.2" o.c.
     24" o.c.
Live
Dead
L/360
L/480
L/360
L/480
L/360
L/480
L/360
L/480
3x2
#2
40
15
15'-9"
15'-9"
15'-9"
14'-11"
15'-6"
14'-0"
14'-3"
12'-10"
4x2
MSR 2100
40
15
19'-9"
19'-5"
19'-1"
17'-3"
17'11"
16'-6"
16'-11"
3x2
#2
50
15
15'-9"
15'-3"
15'-3"
13'-9"
14'-3"
12'-10"
13'-2"
11'-11"
4x2
MSR 2100
50
15
19'-9"
17'-11"
17'-11"
16'-4"
16'-11"
3x2
#2
100
15
13'-2"
11'-11"
11'-11"
10'-8"
11'-1"
9'-11"
9'-3"
8'-9"


11-7/8" Truss Depth*

 11-7/8" Depth Maximum Live Load Deflection - (L/360 & L/480, 1-1/2" Minimum Bearing Each End)
Chord* Size
  Chord* Grade
   Loading (PSF)
12" o.c.
16" o.c.
19.2" o.c.
24" o.c.
   
Live
Dead
L/360
L/480
L/360
L/480
L/360
L/480
L/360
L/480
3x2
#2
40
15
16'-9"
16'-9"
16'-9"
16'-9"
16'-9"
16'-8"
16'-9"
15'-2"
4x2
#2
40
15
18'-9"
18'-9"
18'-9"
18'-9"
18'-9"
18'-7"
17'-2"
17'-2"
4x2
MSR 2100
40
15
22'-9"
22'-9"
22'-9"
21'-0"
21'-5"
19'-10"
19'-3"
3x2
#2
50
15
16'-9"
16'-9"
16'-9"
16'-5"
16'-9"
15'-2"
14'-1"
14'-1"
4x2
#2
50
15
18'-9"
18'-9"
18'-9"
18'-5"
17'-8"
17'-3"
15'-4"
14'-1"
4x2
MSR 2100
50
15
22'-9"
21'-5"
21'-5"
19'-8"
20'-3"
16'-3"
3x2
#2
100
15
15'-7"
14'-1"
13'-11"
12'-9"
12'-3"
11'-11"
10'-4"
10'-4"
4x2
#2
100
15
16'-11"

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14" Truss Depth*

 14" Depth Maximum Live Load Deflection - (L/360 & L/480, 1-1/2" Minimum Bearing Each End)
Chord* Size
  Chord* Grade
Loading (PSF)
12" o.c.
16" o.c.
19.2" o.c.
24" o.c.
 
 
Live
Dead
L/360
L/480
L/360
L/480
L/360
L/480
L/360
L/480
3x2
#2
40
15
17'-9"
17'-9"
17'-9"
17'-9"
17'-9"
17'-9"
17'-9"
16'-4"
4x2
#2
40
15
20'-9"
20'-9"
20'-9"
20'-9"
20'-9"
19'-10"
18'-9"
18'-5"
4x2
MSR 2100
40
15
24'-9"
24'-9"
24'-8"
22'-9"
23'-5"
21'-2"
20'-10"
3x2
#2
50
15
17'-9"
17'-9"
17'-9"
17'-7"
17'-9"
16'-5"
16'-4"
15'-3"
4x2
#2
50
15
20'-9"
20'-9"
20'-9"
19'-8"
19'-9"
18'-6"
4x2
MSR 2100
50
15
24'-9"
23'-2"
23'-2"
21'-0"
21'-10"
3x2
#2
100
15
16'-9"
15'-2"
14'-4"
13'-8"
12'-10"
12'-8"
10'-9"
10'-9"
4x2
#2
100
15
18'-4"


16" Truss Depth*

 16" Depth Maximum Live Load Deflection - (L/360 & L/480, 1-1/2" Minimum Bearing Each End)
Chord* Size
Chord* Grade
Loading (PSF)
12" o.c.
16" o.c.
19.2"o.c.
24" o.c.
Live
Dead
L/360
L/480
L/360
L/480
L/360
L/480
L/360
L/480
3x2
#2
40
15
16'-9"
16'-9"
16'-9"
16'-9"
16'-9"
16'-9"
16'-9"
16'-9"
4x2
#2
40
15
21'-9"
21'-9"
21'-9"
21'-9"
21'-9"
21'-9"
21'-9"
21'-9"
4x2
MSR 2100
40
15
25'-9"
25'-9"
25'-9"
25'-9"
25'-9"
25'-6"
25'-9"
22'-5"
4x2
MSR 2400
40
15
29'-9"
29'-8"
29'-9"
27'-7"
28'-5"
26'-10"
3x2
#2
50
15
16'-9"
16'-9"
16'-9"
16'-9"
16'-9"
16'-9"
16'-9"
16'-9"
4x2
#2
50
15
21'-9"
21'-9"
21'-9"
21'-9"
21'-9"
21'-9"
21'-9"
20'-10"
4x2
MSR 2100
50
15
25'-9"
25'-9"
25'-9"
25'-0"
25'-9"
22'-5"
23'-10"
4x2
MSR 2400
50
15
29'-9"
28'-2"
28'-3"
26'-10"
3x2
#2
100
15
16'-9"
16'-9"
16'-8"
16'-8"
13'-6"
13'-6"
11'-4"
11'-4"
4x2
#2
100
15
21'-9"
20'-10"
19'-1"
19'-0"
16'-9"
15'-9"
4x2
MSR 2100
100
15
23'-3"


18" Truss Depth*

 18" Depth Maximum Live Load Deflection (L/360 & L/480, 1-1/2" Minimum Bearing Each End)

Chord* Size

Chord* Grade
   Loading (PSF)
      12" o.c.
      16" o.c.
    19.2" o.c.
     24" o.c.
Live
Dead
L/360
L/480
L/360
L/480
L/360
L/480
L/360
L/480
4x2
#2
40
25
21'-9"
21'-9"
21'-9"
21'-9"
21'-9"
21'-9"
21'-9"
21'-9"
4x2
MSR 2100
40
25
25'-9"
25'-9"
25'-9"
25'-9"
25'-9"
25'-9"
25'-9"
25'-9"
4x2
MSR 2400
40
25
30'-9"
30'-9"
30'-9"
30'-8"
30'-9"
29'-0"
27'-8"
27'-0"
4x2
#2
100
25
21'-9"
21'-9"
21'-8"
21'-8"
17'-8"
17'-8"
14'-8"
14'-8"
4x2
MSR 2100
100
25
25'-9"
24'-10"
4x2
MSR 2400
100
25
27'-1"


20" Truss Depth*

 20" Depth Maximum Live Load Deflection (L/360 & L/480, 1-1/2" Minimum Bearing Each End)

Chord* Size

Chord* Grade
   Loading (PSF)
      12" o.c.
      16" o.c.
    19.2" o.c.
     24" o.c.
Live
Dead
L/360
L/480
L/360
L/480
L/360
L/480
L/360
L/480
4x2
#2
40
25
21'-9"
21'-9"
21'-9"
21'-9"
21'-9"
21'-9"
21'-9"
21'-9"
4x2
MSR 2100
40
25
25'-9"
25'-9"
25'-9"
25'-9"
25'-9"
25'-9"
25'-9"
25'-9"
4x2
MSR 2400
40
25
31'-9"
31'-9"
31'-9"
31'-9"
31'-9"
31'-9"
27'-8"
27'-8"
4x2
#2
100
25
21'-9"
21'-9"
21'-8"
21'-5"
17'-8"
17'-8"
14'-8"
14'-8"
4x2
MSR 2100
100
25
25'-9"
25'-7"
4x2
MSR 2400
100
25
28'-8"
26'-11"

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  • View details on fire resistance assemblies for one and two hour endurance.
  • * Because OPEN JOIST is a "stock" product, the length of an OPEN JOIST truss determines the size and grade of the truss' chords (see table below). Maximum spans published on the chart above may be limited by standard joist configuration. To find maximum clear span for a given truss depth in a given loading condition, refer to the bottom line of spans shown for that particular truss depth.
  • NOTE: Clear spans shown on this chart are presented under the following conditions: (1) Bearing size varies and is determined by loading conditions, truss span and truss spacing; (2) "Strongback" bracing is not considered; (3) Assumes composite action with a single layer of 3/4" wood sheathing glued and nailed or screwed; (4) Spans are clear distance between supports for uniformly loaded trusses and include allowable increases for repetitive use members.
  • Special Engineering Note:  Open Joist trusses may be manufactured with components that provide increased structural values that may exceed the performance levels indicated in these charts.