TRIFORCE® Open Joist Span Table

Maximum Allowable Spans

Glued & Nailed Subfloor

ΔL ≤ L/480

Live load: 40 psf / Dead Load: 15 psf

Live load 40 psf
Dead load 15 psf
spacing 12" 16" 19.2" 24"
Subfloor[7] 19/32" 23/32"
Depth Lengh Series Maximum floor span o.c.
11 7/8 6'-0" OJ314 3x2 6'-0" 6'-0" 6'-0" 6'-0"
8'-0" 8'-0" 8'-0" 8'-0" 8'-0"
10'-0" 10'-0" 10'-0" 10'-0" 10'-0"
12'-0" 12'-0" 12'-0" 12'-0" 12'-0"
14'-0" 14'-0" 14'-0" 14'-0" 14'-0"
16'-0" 16'-0" 16'-0" 16'-0" 14'-10"
18'-0" OJ315 3x2 18'-0" 18'-0" 17'-6" 16'-4"
OJ418S(9) 4x2 18'-0" 18'-0" 18'-0" 18'-0"
20'-0" OJ415 4x2 20'-0" 20'-0" 19'-5" 18'-2"
OJ418S(9) 4x2 20'-0" 20'-0" 20'-0" 19'-1"
22'-0" OJ418 4x2 22'-0" 21'-9" 20'-6" -----
14 6'-0" OJ314 3x2 6'-0" 6'-0" 6'-0" 6'-0"
8'-0" 8'-0" 8'-0" 8'-0" 8'-0"
10'-0" 10'-0" 10'-0" 10'-0" 10'-0"
12'-0" 12'-0" 12'-0" 12'-0" 12'-0"
14'-0" 14'-0" 14'-0" 14'-0" 14'-0"
16'-0" 16'-0" 16'-0" 16'-0" 16'-0"
18'-0" OJ315 3x2 18'-0" 18'-0" 18'-0" 18'-0"
20'-0" OJ315 3x2 20'-0" 20'-0" 19'-10" -----
OJ418S(9) 4x2 20'-0" 20'-0" 20'-0" 20'-0"
22'-0" OJ415 4x2 22'-0" 22'-0" 22'-0" 20'-7"
24'-0" OJ418 4x2 24'-0" 24'-0" 23'-3" -----
26'-0" 26'-0" 24'-9" ----- -----
16 6'-0" OJ314 3x2 6'-0" 6'-0" 6'-0" 6'-0"
8'-0" 8'-0" 8'-0" 8'-0" 8'-0"
10'-0" 10'-0" 10'-0" 10'-0" 10'-0"
12'-0" 12'-0" 12'-0" 12'-0" 12'-0"
14'-0" 14'-0" 14'-0" 14'-0" 14'-0"
16'-0" 16'-0" 16'-0" 16'-0" 16'-0"
18'-0" OJ315 3x2 18'-0" 18'-0" 18'-0" 18'-0"
20'-0" OJ315 3x2 20'-0" 20'-0" 20'-0" 19'-3"
OJ418S(9) 4x2 20'-0" 20'-0" 20'-0" 20'-0"
22'-0" OJ418 4x2 22'-0" 22'-0" 22'-0" 22'-0"
24'-0" 24'-0" 24'-0" 24'-0" 24'-0"
26'-0" 26'-0" 26'-0" 25'-8" -----
28'-0" OJ420 4x2 28'-0" 28'-0" 26'-6" -----
30'-0" 30'-0" 29'-2" ----- -----

Live load: 40 psf / Dead Load: 25 psf

Live load 40 psf
Dead load 25 psf
spacing 12" 16" 19.2" 24"
Subfloor[7] 19/32" 23/32"
Depth Lengh Series Maximum floor span o.c.
11 7/8 6'-0" OJ314 3x2 6'-0" 6'-0" 6'-0" 6'-0"
8'-0" 8'-0" 8'-0" 8'-0" 8'-0"
10'-0" 10'-0" 10'-0" 10'-0" 10'-0"
12'-0" 12'-0" 12'-0" 12'-0" 12'-0"
14'-0" 14'-0" 14'-0" 14'-0" 13'-7"
16'-0" 16'-0" 16'-0" 15'-3" -----
18'-0" OJ315 3x2 18'-0" 18'-0" 16'-9" -----
OJ418S(9) 4x2 18'-0" 18'-0" 18'-0" 18'-0"
20'-0" OJ415 4x2 20'-0" 20'-0" 19'-5" -----
OJ418S(9) 4x2 20'-0" 20'-0" 20'-0" 19'-1"
22'-0" OJ418 4x2 22'-0" 21'-9" 20'-6" -----
14 6'-0" OJ314 3x2 6'-0" 6'-0" 6'-0" 6'-0"
8'-0" 8'-0" 8'-0" 8'-0" 8'-0"
10'-0" 10'-0" 10'-0" 10'-0" 10'-0"
12'-0" 12'-0" 12'-0" 12'-0" 12'-0"
14'-0" 14'-0" 14'-0" 14'-0" 14'-0"
16'-0" 16'-0" 16'-0" 16'-0" 14'-11"
18'-0" OJ315 3x2 18'-0" 18'-0" 18'-0" 16'-5"
20'-0" OJ315 3x2 20'-0" 20'-0" 18'-5" -----
OJ418S(9) 4x2 20'-0" 20'-0" 20'-0" 20'-0"
22'-0" OJ415 4x2 22'-0" 22'-0" 22'-0" -----
24'-0" OJ418 4x2 24'-0" 24'-0" 23'-3" -----
26'-0" 26'-0" 24'-9" ----- -----
16 6'-0" OJ314 3x2 6'-0" 6'-0" 6'-0" 6'-0"
8'-0" 8'-0" 8'-0" 8'-0" 8'-0"
10'-0" 10'-0" 10'-0" 10'-0" 10'-0"
12'-0" 12'-0" 12'-0" 12'-0" 12'-0"
14'-0" 14'-0" 14'-0" 14'-0" 14'-0"
16'-0" 16'-0" 16'-0" 16'-0" 16'-0"
18'-0" OJ315 3x2 18'-0" 18'-0" 18'-0" 17'-9"
20'-0" OJ315 3x2 20'-0" 20'-0" 19'-10" -----
OJ418S(9) 4x2 20'-0" 20'-0" 20'-0" 20'-0"
22'-0" OJ418 4x2 22'-0" 22'-0" 22'-0" 20'-9"
24'-0" 24'-0" 24'-0" 24'-0" -----
26'-0" 26'-0" 26'-0" 25'-8" -----
28'-0" OJ420 4x2 28'-0" 28'-0" 25'-11" -----
30'-0" 30'-0" 28'-2" ----- -----

Live load: 100 psf / Dead Load: 15 psf

Live load 100 psf
Dead load 15 psf
spacing 12" 16" 19.2" 24"
Subfloor[7] 19/32" 23/32"
Depth Lengh Series Maximum floor span o.c.
11 7/8 6'-0" OJ314 3x2 6'-0" 6'-0" 6'-0" 6'-0"
8'-0" 8'-0" 8'-0" 8'-0" 8'-0"
10'-0" 10'-0" 10'-0" 10'-0" 10'-0"
12'-0" 12'-0" 12'-0" 11'-5" 10'-3"
14'-0" 14'-0" 12'-7" ----- -----
16'-0" 13'-3" ----- ----- -----
18'-0" OJ315 3x2 ----- ----- ----- -----
OJ418S(9) 4x2 17'-2" ----- ----- -----
20'-0" OJ415 4x2 ----- ----- ----- -----
OJ418S(9) 4x2 ----- ----- ----- -----
22'-0" OJ418 4x2 ----- ----- ----- -----
14 6'-0" OJ314 3x2 6'-0" 6'-0" 6'-0" 6'-0"
8'-0" 8'-0" 8'-0" 8'-0" 8'-0"
10'-0" 10'-0" 10'-0" 10'-0" 10'-0"
12'-0" 12'-0" 12'-0" 12'-0" 11'-2"
14'-0" 14'-0" 13'-9" 12'-6" -----
16'-0" 16'-0" ----- ----- -----
18'-0" OJ315 3x2 16'-7" ----- ----- -----
20'-0" OJ315 3x2 ----- ----- ----- -----
OJ418S(9) 4x2 19'-6" ----- ----- -----
22'-0" OJ415 4x2 ----- ----- ----- -----
24'-0" OJ418 4x2 ----- ----- ----- -----
26'-0" ----- ----- ----- -----
16 6'-0" OJ314 3x2 6'-0" 6'-0" 6'-0" 6'-0"
8'-0" 8'-0" 8'-0" 8'-0" 8'-0"
10'-0" 10'-0" 10'-0" 10'-0" 10'-0"
12'-0" 12'-0" 12'-0" 12'-0" 11'-8"
14'-0" 14'-0" 14'-0" 13'-4" -----
16'-0" 16'-0" 14'-8" ----- -----
18'-0" OJ315 3x2 18'-0" 16'-4" ----- -----
20'-0" OJ315 3x2 18'-4" ----- ----- -----
OJ418S(9) 4x2 20'-0" ----- ----- -----
22'-0" OJ418 4x2 21'-7" ----- ----- -----
24'-0" ----- ----- ----- -----
26'-0" ----- ----- ----- -----
28'-0" OJ420 4x2 ----- ----- ----- -----
30'-0" ----- ----- ----- -----
Live load 40 psf 40 psf 100 psf
Dead load 15 psf 25 psf 15 psf
spacing 12" 16" 19.2" 24" 12" 16" 19.2" 24" 12" 16" 19.2" 24"
Subfloor[7] 19/32" 23/32" 19/32" 23/32" 19/32" 23/32"
Depth Lengh Series Maximum floor span o.c.
11 7/8 6'-0" OJ314 3x2 6'-0" 6'-0" 6'-0" 6'-0" 6'-0" 6'-0" 6'-0" 6'-0" 6'-0" 6'-0" 6'-0" 6'-0"
8'-0" 8'-0" 8'-0" 8'-0" 8'-0" 8'-0" 8'-0" 8'-0" 8'-0" 8'-0" 8'-0" 8'-0" 8'-0"
10'-0" 10'-0" 10'-0" 10'-0" 10'-0" 10'-0" 10'-0" 10'-0" 10'-0" 10'-0" 10'-0" 10'-0" 10'-0"
12'-0" 12'-0" 12'-0" 12'-0" 12'-0" 12'-0" 12'-0" 12'-0" 12'-0" 12'-0" 12'-0" 11'-5" 10'-3"
14'-0" 14'-0" 14'-0" 14'-0" 14'-0" 14'-0" 14'-0" 14'-0" 13'-7" 14'-0" 12'-7" ----- -----
16'-0" 16'-0" 16'-0" 16'-0" 14'-10" 16'-0" 16'-0" 15'-3" ----- 13'-3" ----- ----- -----
18'-0" OJ315 3x2 18'-0" 18'-0" 17'-6" 16'-4" 18'-0" 18'-0" 16'-9" ----- ----- ----- ----- -----
OJ418S(9) 4x2 18'-0" 18'-0" 18'-0" 18'-0" 18'-0" 18'-0" 18'-0" 18'-0" 17'-2" ----- ----- -----
20'-0" OJ415 4x2 20'-0" 20'-0" 19'-5" 18'-2" 20'-0" 20'-0" 19'-5" ----- ----- ----- ----- -----
OJ418S(9) 4x2 20'-0" 20'-0" 20'-0" 19'-1" 20'-0" 20'-0" 20'-0" 19'-1" ----- ----- ----- -----
22'-0" OJ418 4x2 22'-0" 21'-9" 20'-6" ----- 22'-0" 21'-9" 20'-6" ----- ----- ----- ----- -----
14 6'-0" OJ314 3x2 6'-0" 6'-0" 6'-0" 6'-0" 6'-0" 6'-0" 6'-0" 6'-0" 6'-0" 6'-0" 6'-0" 6'-0"
8'-0" 8'-0" 8'-0" 8'-0" 8'-0" 8'-0" 8'-0" 8'-0" 8'-0" 8'-0" 8'-0" 8'-0" 8'-0"
10'-0" 10'-0" 10'-0" 10'-0" 10'-0" 10'-0" 10'-0" 10'-0" 10'-0" 10'-0" 10'-0" 10'-0" 10'-0"
12'-0" 12'-0" 12'-0" 12'-0" 12'-0" 12'-0" 12'-0" 12'-0" 12'-0" 12'-0" 12'-0" 12'-0" 11'-2"
14'-0" 14'-0" 14'-0" 14'-0" 14'-0" 14'-0" 14'-0" 14'-0" 14'-0" 14'-0" 13'-9" 12'-6" -----
16'-0" 16'-0" 16'-0" 16'-0" 16'-0" 16'-0" 16'-0" 16'-0" 14'-11" 16'-0" ----- ----- -----
18'-0" OJ315 3x2 18'-0" 18'-0" 18'-0" 18'-0" 18'-0" 18'-0" 18'-0" 16'-5" 16'-7" ----- ----- -----
20'-0" OJ315 3x2 20'-0" 20'-0" 19'-10" ----- 20'-0" 20'-0" 18'-5" ----- ----- ----- ----- -----
OJ418S(9) 4x2 20'-0" 20'-0" 20'-0" 20'-0" 20'-0" 20'-0" 20'-0" 20'-0" 19'-6" ----- ----- -----
22'-0" OJ415 4x2 22'-0" 22'-0" 22'-0" 20'-7" 22'-0" 22'-0" 22'-0" ----- ----- ----- ----- -----
24'-0" OJ418 4x2 24'-0" 24'-0" 23'-3" ----- 24'-0" 24'-0" 23'-3" ----- ----- ----- ----- -----
26'-0" 26'-0" 24'-9" ----- ----- 26'-0" 24'-9" ----- ----- ----- ----- ----- -----
16 6'-0" OJ314 3x2 6'-0" 6'-0" 6'-0" 6'-0" 6'-0" 6'-0" 6'-0" 6'-0" 6'-0" 6'-0" 6'-0" 6'-0"
8'-0" 8'-0" 8'-0" 8'-0" 8'-0" 8'-0" 8'-0" 8'-0" 8'-0" 8'-0" 8'-0" 8'-0" 8'-0"
10'-0" 10'-0" 10'-0" 10'-0" 10'-0" 10'-0" 10'-0" 10'-0" 10'-0" 10'-0" 10'-0" 10'-0" 10'-0"
12'-0" 12'-0" 12'-0" 12'-0" 12'-0" 12'-0" 12'-0" 12'-0" 12'-0" 12'-0" 12'-0" 12'-0" 11'-8"
14'-0" 14'-0" 14'-0" 14'-0" 14'-0" 14'-0" 14'-0" 14'-0" 14'-0" 14'-0" 14'-0" 13'-4" -----
16'-0" 16'-0" 16'-0" 16'-0" 16'-0" 16'-0" 16'-0" 16'-0" 16'-0" 16'-0" 14'-8" ----- -----
18'-0" OJ315 3x2 18'-0" 18'-0" 18'-0" 18'-0" 18'-0" 18'-0" 18'-0" 17'-9" 18'-0" 16'-4" ----- -----
20'-0" OJ315 3x2 20'-0" 20'-0" 20'-0" 19'-3" 20'-0" 20'-0" 19'-10" ----- 18'-4" ----- ----- -----
OJ418S(9) 4x2 20'-0" 20'-0" 20'-0" 20'-0" 20'-0" 20'-0" 20'-0" 20'-0" 20'-0" ----- ----- -----
22'-0" OJ418 4x2 22'-0" 22'-0" 22'-0" 22'-0" 22'-0" 22'-0" 22'-0" 20'-9" 21'-7" ----- ----- -----
24'-0" 24'-0" 24'-0" 24'-0" 24'-0" 24'-0" 24'-0" 24'-0" ----- ----- ----- ----- -----
26'-0" 26'-0" 26'-0" 25'-8" ----- 26'-0" 26'-0" 25'-8" ----- ----- ----- ----- -----
28'-0" OJ420 4x2 28'-0" 28'-0" 26'-6" ----- 28'-0" 28'-0" 25'-11" ----- ----- ----- ----- -----
30'-0" 30'-0" 29'-2" ----- ----- 30'-0" 28'-2" ----- ----- ----- ----- ----- -----

Notes:

  1. The indicated spans are based on simple span joists.
  2. Minimum end bearing length is 1½”, bold spans require web stiffeners at OSB end panel.
  3. Maximum spans are measured centerline to centerline of bearing and are based on uniformly loaded joists.
  4. Total Load deflection is limited to L/240.
  5. Live Load deflection is limited to L/480.
  6. The indicated spans are based on the Allowable Stress Design method as per NDS, ICC IBC/IRC code.
  7. The considered subfloor is a “20 oc APA rated panel” for joist’s spacing of 12″, 16″ and 19.2″ o.c. and is a “24 oc APA rated panel” for joist’s spacing of 24″ o.c. The subfloor must be glued as per APA Specification AFG-01 or ASTM D3498 and nailed as per NDS, ICC IBC/IRC code.
  8. Refer to appropriate sections of the Specifier Guide for installation guidelines and construction details.
  9. S = Limited inventory. Please contact your representative to determine quantities.