TRIFORCE® Open Joist Span Table

Choose your edition:

Maximum Allowable Spans - US Edition

Glued & Nailed Subfloor

ΔL ≤ L/480

Live load: 40 psf / Dead Load: 15 psf / Depth: 11 7/8″ – Span table

Live load 40 psf
Dead load 15 psf
spacing 12" 16" 19.2" 24"
Subfloor[7] 19/32" 23/32"
Lengh Series Maximum floor span o.c.
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" -----

Live load: 40 psf / Dead Load: 15 psf / Depth: 14″ – Span table

Live load 40 psf
Dead load 15 psf
spacing 12" 16" 19.2" 24"
Subfloor[7] 19/32" 23/32"
Lengh Series Maximum floor span o.c.
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" ----- -----

Live load: 40 psf / Dead Load: 15 psf / Depth: 16″ – Span table

Live load 40 psf
Dead load 15 psf
spacing 12" 16" 19.2" 24"
Subfloor[7] 19/32" 23/32"
Lengh Series Maximum floor span o.c.
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" 28'-2" ----- -----

Live load: 40 psf / Dead Load: 25 psf / Depth: 11 7/8″ – Span table

Live load 40 psf
Dead load 25 psf
spacing 12" 16" 19.2" 24"
Subfloor[7] 19/32" 23/32"
Lengh Series Maximum floor span o.c.
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
(3x2)
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" -----

Live load: 40 psf / Dead Load: 25 psf / Depth: 14″ – Span table

Live load 40 psf
Dead load 25 psf
spacing 12" 16" 19.2" 24"
Subfloor[7] 19/32" 23/32"
Lengh Series Maximum floor span o.c.
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" ----- -----

Live load: 40 psf / Dead Load: 25 psf / Depth: 16″ – Span table

Live load 40 psf
Dead load 25 psf
spacing 12" 16" 19.2" 24"
Subfloor[7] 19/32" 23/32"
Lengh Series Maximum floor span o.c.
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 / Depth: 11 7/8″ – Span table

Live load 100 psf
Dead load 15 psf
spacing 12" 16" 19.2" 24"
Subfloor[7] 19/32" 23/32"
Lengh Series Maximum floor span o.c.
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" 14'-3" ----- ----- -----
18'-0" OJ315
(3x2)
----- ----- ----- -----
OJ418S(9)
(4x2)
17'-2" ----- ----- -----
20'-0" OJ415
(4x2)
----- ----- ----- -----
OJ418S(9)
(4x2)
----- ----- ----- -----
22'-0" OJ418
(4x2)
----- ----- ----- -----

 

Live load: 100 psf / Dead Load: 15 psf / Depth: 14″ – Span table

Live load 100 psf
Dead load 15 psf
spacing 12" 16" 19.2" 24"
Subfloor[7] 19/32" 23/32"
Lengh Series Maximum floor span o.c.
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" ----- ----- ----- -----

Live load: 100 psf / Dead Load: 15 psf / Depth: 16″ – Span table

Live load 100 psf
Dead load 15 psf
spacing 12" 16" 19.2" 24"
Subfloor[7] 19/32" 23/32"
Lengh Series Maximum floor span o.c.
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" ----- 14'-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" 28'-2" ----- ----- 30'-0" 28'-2" ----- ----- ----- ----- ----- -----

Notes:

  1. The indicated spans are based on simple span joists.
  2. Minimum end bearing length is 1½”, spans in bold 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.

Maximum Allowable Spans - Canadian Edition

Glued & Nailed Subfloor with strongbacks / ceiling optional

ΔL ≤ L/360

Live load: 40 psf / Dead Load: 15 psf / Depth: 11 7/8″ – Span table

Live load 40 psf
Dead load 15 psf
spacing 12" 16" 19.2" 24"
Subfloor[9] 19/32" 23/32"
Lengh Series Maximum floor span o.c.
Required Strongback[1]
6'-0" OJ314
(3x2)
6'-0"
None
6'-0"
None
6'-0"
None
6'-0"
None
8'-0" 8'-0"
None
8'-0"
None
8'-0"
None
8'-0"
None
10'-0" 10'-0"
None
10'-0"
None
10'-0"
None
10'-0"
None
12'-0" 12'-0"
None
12'-0"
None
12'-0"
None
12'-0"
None
14'-0" 14'-0"
None
14'-0"
None
14'-0"
None
14'-0"
None
16'-0" 16'-0"
None
16'-0"
1 - 2x4
16'-0"
1 - 2x4
15'-4"
1 - 2x4
18'-0" OJ315
(3x2)
18'-0"
1 - 2x4
18'-0"
1 - 2x6
18'-0"
1 - 2x6
16'-11"
1 - 2x6
OJ418S(10)
(4x2)
18'-0"
None
18'-0"
1 - 2x4
18'-0"
1 - 2x4
18'-0"
2 - 2x4
20'-0" OJ415
(4x2)
20'-0"
2 - 2x4
20'-0"
1 - 2x6
20'-0"
2 - 2x6
19'-1"
2 - 2x6
OJ418S(10)
(4x2)
20'-0"
1 - 2x4
20'-0"
1 - 2x6
20'-0"
1 - 2x6
20'-0"
2 - 2x6
22'-0" OJ418
(4x2)
22'-0"
1 - 2x6
22'-0"
2 - 2x6
22'-0"
2 - 2x8
20'-2"
1 - 2x8

Live load: 40 psf / Dead Load: 15 psf / Depth: 14″ – Span table

Live load 40 psf
Dead load 15 psf
spacing 12" 16" 19.2" 24"
Subfloor[9] 19/32" 23/32"
Lengh Series Maximum floor span o.c.
Required Strongback[1]
6'-0" OJ314
(3x2)
6'-0"
None
6'-0"
None
6'-0"
None
6'-0"
None
8'-0" 8'-0"
None
8'-0"
None
8'-0"
None
8'-0"
None
10'-0" 10'-0"
None
10'-0"
None
10'-0"
None
10'-0"
None
12'-0" 12'-0"
None
12'-0"
None
12'-0"
None
12'-0"
None
14'-0" 14'-0"
None
14'-0"
None
14'-0"
None
14'-0"
None
16'-0" 16'-0"
None
16'-0"
None
16'-0"
None
16'-0"
None
18'-0" OJ315
(3x2)
18'-0"
None
18'-0"
1 - 2x6
18'-0"
1 - 2x6
18'-0"
1 - 2x6
20'-0" OJ315
(3x2)
20'-0"
1 - 2x6
20'-0"
1 - 2x6
20'-0"
2 - 2x6
18'-7"
1 - 2x6
OJ418S(10)
(4x2)
20'-0"
None
20'-0"
1 - 2x6
20'-0"
1 - 2x6
20'-0"
1 - 2x6
22'-0" OJ415
(4x2)
22'-0"
1 - 2x6
22'-0"
1 - 2x6
22'-0"
2 - 2x6
21'-8"
1 - 2x8
24'-0" OJ418
(4x2)
24'-0"
1 - 2x6
24'-0"
2 - 2x6
24'-0"
2 - 2x8
22'-11"
2 - 2x8
26'-0" 26'-0"
2 - 2x6
26'-0"
2 - 2x8
24'-10"
2 - 2x8
-----

Live load: 40 psf / Dead Load: 15 psf / Depth: 16″ – Span table

Live load 40 psf
Dead load 15 psf
spacing 12" 16" 19.2" 24"
Subfloor[9] 19/32" 23/32"
Lengh Series Maximum floor span o.c.
Required Strongback[1]
6'-0" OJ314
(3x2)
6'-0"
None
6'-0"
None
6'-0"
None
6'-0"
None
8'-0" 8'-0"
None
8'-0"
None
8'-0"
None
8'-0"
None
10'-0" 10'-0"
None
10'-0"
None
10'-0"
None
10'-0"
None
12'-0" 12'-0"
None
12'-0"
None
12'-0"
None
12'-0"
None
14'-0" 14'-0"
None
14'-0"
None
14'-0"
None
14'-0"
None
16'-0" 16'-0"
None
16'-0"
None
16'-0"
None
16'-0"
None
18'-0" OJ315
(3x2)
18'-0"
None
18'-0"
None
18'-0"
1 - 2x6
18'-0"
1 - 2x6
20'-0" OJ315
(3x2)
20'-0"
1 - 2x6
20'-0"
1 - 2x6
20'-0"
1 - 2x6
20'-0"
1 - 2x6
OJ418S(10)
(4x2)
20'-0"
None
20'-0"
None
20'-0"
1 - 2x6
20'-0"
1 - 2x6
22'-0" OJ418
(4x2)
22'-0"
None
22'-0"
1 - 2x6
22'-0"
1 - 2x6
22'-0"
1 - 2x6
24'-0" 24'-0"
1 - 2x6
24'-0"
1 - 2x6
24'-0"
2 - 2x6
24'-0"
2 - 2x6
26'-0" 26'-0"
1 - 2x6
26'-0"
1 - 2x6
26'-0"
1 - 2x8
25'-5"
2 - 2x8
28'-0" OJ420
(4x2)
28'-0"
2 - 2x6
28'-0"
2 - 2x8
28'-0"
1 - 2x10
26'-3"
2 - 2x8
30'-0" 30'-0"
2 - 2x8
30'-0"
2 - 2x10
28'-6"
2 - 2x10
-----

Live load: 40 psf / Dead Load: 36 psf / Depth: 11 7/8″ – Span table

Live load 40 psf
Dead load 36 psf
spacing 12" 16" 19.2" 24"
Subfloor[9] 19/32" 23/32"
Lengh Series Maximum floor span o.c.
Required Strongback[1]
6'-0" OJ314
(3x2)
6'-0"
None
6'-0"
None
6'-0"
None
6'-0"
None
8'-0" 8'-0"
None
8'-0"
None
8'-0"
None
8'-0"
None
10'-0" 10'-0"
None
10'-0"
None
10'-0"
None
10'-0"
None
12'-0" 12'-0"
None
12'-0"
None
12'-0"
None
12'-0"
None
14'-0" 14'-0"
None
14'-0"
None
14'-0"
None
13'-3"
None
16'-0" 16'-0"
None
16'-0"
1 - 2x4
14'-10"
None
-----
18'-0" OJ315
(3x2)
18'-0"
1 - 2x4
18'-0"
1 - 2x6
16'-5"
1 - 2x4
-----
OJ418S(10)
(4x2)
18'-0"
None
18'-0"
1 - 2x4
18'-0"
1 - 2x4
16'-8"
1 - 2x4
20'-0" OJ415
(4x2)
20'-0"
2 - 2x4
20'-0"
1 - 2x6
19' - 5"
2-2x6
-----
OJ418S(10)
(4x2)
20'-0"
1 - 2x4
20'-0"
1 - 2x6
20'-0"
1 - 2x6
-----
22'-0" OJ418
(4x2)
22'-0"
1 - 2x6
22'-0"
2 - 2x6
20'-10"
2 - 2x6
-----

Live load: 40 psf / Dead Load: 36 psf / Depth: 14″ – Span table

Live load 40 psf
Dead load 36 psf
spacing 12" 16" 19.2" 24"
Subfloor[9] 19/32" 23/32"
Lengh Series Maximum floor span o.c.
Required Strongback[1]
6'-0" OJ314
(3x2)
6'-0"
None
6'-0"
None
6'-0"
None
6'-0"
None
8'-0" 8'-0"
None
8'-0"
None
8'-0"
None
8'-0"
None
10'-0" 10'-0"
None
10'-0"
None
10'-0"
None
10'-0"
None
12'-0" 12'-0"
None
12'-0"
None
12'-0"
None
12'-0"
None
14'-0" 14'-0"
None
14'-0"
None
14'-0"
None
14'-0"
None
16'-0" 16'-0"
None
16'-0"
None
16'-0"
None
14'-6"
None
18'-0" OJ315
(3x2)
18'-0"
None
18'-0"
1 - 2x6
18'-0"
1 - 2x6
16'-1"
None
20'-0" OJ315
(3x2)
20'-0"
1 - 2x6
19'-9"
1 - 2x6
----- -----
OJ418S(10)
(4x2)
20'-0"
None
20'-0"
1 - 2x6
20'-0"
1 - 2x6
-----
22'-0" OJ415
(4x2)
22'-0"
1 - 2x6
22'-0"
1 - 2x6
21'-4"
2 - 2x6
-----
24'-0" OJ418
(4x2)
24'-0"
1 - 2x6
24'-0"
2 - 2x6
22'-4"
2 - 2x6
-----
26'-0" 26'-0"
2 - 2x6
25'-1"
2 - 2x8
----- -----

Live load: 40 psf / Dead Load: 36 psf / Depth: 16″ – Span table

Live load 40 psf
Dead load 36 psf
spacing 12" 16" 19.2" 24"
Subfloor[9] 19/32" 23/32"
Lengh Series Maximum floor span o.c.
Required Strongback[1]
6'-0" OJ314
(3x2)
6'-0"
None
6'-0"
None
6'-0"
None
6'-0"
None
8'-0" 8'-0"
None
8'-0"
None
8'-0"
None
8'-0"
None
10'-0" 10'-0"
None
10'-0"
None
10'-0"
None
10'-0"
None
12'-0" 12'-0"
None
12'-0"
None
12'-0"
None
12'-0"
None
14'-0" 14'-0"
None
14'-0"
None
14'-0"
None
14'-0"
None
16'-0" 16'-0"
None
16'-0"
None
16'-0"
None
15'-6"
None
18'-0" OJ315
(3x2)
18'-8"
None
18'-8"
None
18'-8"
1 - 2x6
17'-4"
None
20'-0" OJ315
(3x2)
20'-0"
1 - 2x6
20'-0"
1 - 2x6
19'-5"
1 - 2x6
-----
OJ418S(10)
(4x2)
20'-0"
None
20'-0"
None
20'-0"
1 - 2x6
20'-0"
1 - 2x6
22'-0" OJ418
(4x2)
22'-0"
None
22'-0"
1 - 2x6
22'-0"
1 - 2x6
20'-2"
1 - 2x6
24'-0" 24'-0"
1 - 2x6
24'-0"
1 - 2x6
24'-0"
2 - 2x6
-----
26'-0" 26'-0"
1 - 2x6
26'-0"
2 - 2x6
25'-3"
2 - 2x6
-----
28'-0" OJ420
(4x2)
28'-0"
2 - 2x6
28'-0"
2 - 2x8
----- -----
30'-0" 30'-0"
2 - 2x8
28'-8"
2 - 2x8
----- -----

Live load: 100 psf / Dead Load: 15 psf / Depth: 11 7/8″ – Span table

Live load 100 psf
Dead load 15 psf
spacing 12" 16" 19.2" 24"
Subfloor[9] 19/32" 23/32"
Lengh Series Maximum floor span o.c.
Required Strongback[1]
6'-0" OJ314
(3x2)
6'-0"
None
6'-0"
None
6'-0"
None
6'-0"
None
8'-0" 8'-0"
None
8'-0"
None
8'-0"
None
8'-0"
None
10'-0" 10'-0"
None
10'-0"
None
10'-0"
None
10'-0"
None
12'-0" 12'-0"
None
12'-0"
None
11'-8"
None
10'-3"
None
14'-0" 14'-0"
None
12'-10"
None
----- -----
16'-0" 14'-10"
None
----- ----- -----
18'-0" OJ315
(3x2)
----- ----- ----- -----
OJ418S(10)
(3x2)
18'-0"
None
----- ----- -----
20'-0" OJ415
(4x2)
----- ----- ----- -----
OJ418S(10)
(3x2)
18'-7"
1 - 2x4
----- ----- -----
22'-0" OJ418
(3x2)
----- ----- ----- -----

Live load: 100 psf / Dead Load: 15 psf / Depth: 14″ – Span table

Live load 100 psf
Dead load 15 psf
spacing 12" 16" 19.2" 24"
Subfloor[9] 19/32" 23/32"
Lengh Series Maximum floor span o.c.
Required Strongback[1]
6'-0" OJ314
(3x2)
6'-0"
None
6'-0"
None
6'-0"
None
6'-0"
None
8'-0" 8'-0"
None
8'-0"
None
8'-0"
None
8'-0"
None
10'-0" 10'-0"
None
10'-0"
None
10'-0"
None
10'-0"
None
12'-0" 12'-0"
None
12'-0"
None
12'-0"
None
11'-0"
None
14'-0" 14'-0"
None
14'-0"
None
12' - 10"
None
-----
16'-0" 16'-0"
None
----- ----- -----
18'-0" OJ315
(3x2)
17'-9"
None
----- ----- -----
20'-0" OJ315
(3x2)
----- ----- ----- -----
OJ418S(10)
(4x2)
20'-0"
None
----- ----- -----
22'-0" OJ415
(4x2)
----- ----- ----- -----
24'-0" OJ418
(4x2)
----- ----- ----- -----
26'-0" ----- ----- ----- -----

Live load: 100 psf / Dead Load: 15 psf / Depth: 16″ – Span table

Live load 100 psf
Dead load 15 psf
spacing 12" 16" 19.2" 24"
Subfloor[9] 19/32" 23/32"
Lengh Series Maximum floor span o.c.
Required Strongback[1]
6'-0" OJ314
(3x2)
6'-0"
None
6'-0"
None
6'-0"
None
6'-0"
None
8'-0" 8'-0"
None
8'-0"
None
8'-0"
None
8'-0"
None
10'-0" 10'-0"
None
10'-0"
None
10'-0"
None
10'-0"
None
12'-0" 12'-0"
None
12'-0"
None
12'-0"
None
12'-0"
None
14'-0" 14'-0"
None
14'-0"
None
13'-8"
None
12'-2"
None
16'-0" 16'-0"
None
14'-11"
None
----- -----
18'-0" OJ315
(3x2)
18'-0"
None
16'-9"
None
----- -----
20'-0" OJ315
(3x2)
19'-4"
None
----- ----- -----
OJ418S(10)
(4x2)
20'-0"
None
18'-10"
None
----- -----
22'-0" OJ418
(4x2)
22'-0"
None
----- ----- -----
24'-0" 23'-5"
1 - 2x6
----- ----- -----
26'-0" ----- ----- ----- -----
28'-0" OJ420
(4x2)
----- ----- ----- -----
30'-0" ----- ----- ----- -----
Live load 40 psf 40 psf 100 psf
Dead load 15 psf 36 psf 15 psf
spacing 12" 16" 19.2" 24" 12" 16" 19.2" 24" 12" 16" 19.2" 24"
Subfloor[9] 19/32" 23/32" 19/32" 23/32" 19/32" 23/32"
Depth Lengh Series Maximum span o.c.
Required Strongback[1]
11 7/8 6' - 0" OJ314 3x2 6' - 0"
None
6' - 0"
None
6' - 0"
None
6' - 0"
None
6' - 0"
None
6' - 0"
None
6' - 0"
None
6' - 0"
None
6' - 0"
None
6' - 0"
None
6' - 0"
None
6' - 0"
None
8' - 0" 8' - 0"
None
8' - 0"
None
8' - 0"
None
8' - 0"
None
8' - 0"
None
8' - 0"
None
8' - 0"
None
8' - 0"
None
8' - 0"
None
8' - 0"
None
8' - 0"
None
8' - 0"
None
10' - 0" 10' - 0"
None
10' - 0"
None
10' - 0"
None
10' - 0"
None
10' - 0"
None
10' - 0"
None
10' - 0"
None
10' - 0"
None
10' - 0"
None
10' - 0"
None
10' - 0"
None
10' - 0"
None
12' - 0" 12' - 0"
None
12' - 0"
None
12' - 0"
None
12' - 0"
None
12' - 0"
None
12' - 0"
None
12' - 0"
None
12' - 0"
None
12' - 0"
None
12' - 0"
None
11' - 8"
None
10' - 3"
None
14' - 0" 14' - 0"
None
14' - 0"
None
14' - 0"
None
14' - 0"
None
14' - 0"
None
14' - 0"
None
14' - 0"
None
13' - 3"
None
14' - 0"
None
12' - 10"
None
----- -----
16' - 0" 16' - 0"
None
16' - 0"
1 - 2x4
16' - 0"
1 - 2x4
15' - 4"
1 - 2x4
16' - 0"
None
16' - 0"
1 - 2x4
14' - 10"
None
----- 14' - 10"
None
----- ----- -----
18' - 0" OJ315 3x2 18' - 0"
1 - 2x4
18' - 0"
1 - 2x6
18' - 0"
1 - 2x6
16' - 11"
1 - 2x6
18' - 0"
1 - 2x4
18' - 0"
1 - 2x6
16' - 5"
1 - 2x4
----- ----- ----- ----- -----
OJ418S(10) 4x2 18' - 0"
None
18' - 0"
1 - 2x4
18' - 0"
1 - 2x4
18' - 0"
2 - 2x4
18' - 0"
None
18' - 0"
1 - 2x4
18' - 0"
1 - 2x4
16' - 8"
1 - 2x4
18' - 0"
None
----- ----- -----
20' - 0" OJ415 4x2 20' - 0"
2 - 2x4
20' - 0"
1 - 2x6
20' - 0"
2 - 2x6
19' - 1"
2 - 2x6
20' - 0"
2 - 2x4
20' - 0"
1 - 2x6
19' - 5"
2 - 2x6
----- ----- ----- ----- -----
OJ418S(10) 4x2 20' - 0"
1 - 2x4
20' - 0"
1 - 2x6
20' - 0"
1 - 2x6
20' - 0"
2 - 2x6
20' - 0"
1 - 2x4
20' - 0"
1 - 2x6
20' - 0"
1 - 2x6
----- 18' - 7"
1 - 2x4
----- ----- -----
22' - 0" OJ418 4x2 22' - 0"
1 - 2x6
22' - 0"
2 - 2x6
22' - 0"
2 - 2x8
20' - 2"
1 - 2x8
22' - 0"
1 - 2x6
22' - 0"
2 - 2x6
20' - 10"
2 - 2x6
----- ----- ----- ----- -----
14 6' - 0" OJ314 3x2 6' - 0"
None
6' - 0"
None
6' - 0"
None
6' - 0"
None
6' - 0"
None
6' - 0"
None
6' - 0"
None
6' - 0"
None
6' - 0"
None
6' - 0"
None
6' - 0"
None
6' - 0"
None
8' - 0" 8' - 0"
None
8' - 0"
None
8' - 0"
None
8' - 0"
None
8' - 0"
None
8' - 0"
None
8' - 0"
None
8' - 0"
None
8' - 0"
None
8' - 0"
None
8' - 0"
None
8' - 0"
None
10' - 0" 10' - 0"
None
10' - 0"
None
10' - 0"
None
10' - 0"
None
10' - 0"
None
10' - 0"
None
10' - 0"
None
10' - 0"
None
10' - 0"
None
10' - 0"
None
10' - 0"
None
10' - 0"
None
12' - 0" 12' - 0"
None
12' - 0"
None
12' - 0"
None
12' - 0"
None
12' - 0"
None
12' - 0"
None
12' - 0"
None
12' - 0"
None
12' - 0"
None
12' - 0"
None
12' - 0"
None
11' - 0"
None
14' - 0" 14' - 0"
None
14' - 0"
None
14' - 0"
None
14' - 0"
None
14' - 0"
None
14' - 0"
None
14' - 0"
None
14' - 0"
None
14' - 0"
None
14' - 0"
None
12' - 10"
None
-----
16' - 0" 16' - 0"
None
16' - 0"
None
16' - 0"
None
16' - 0"
None
16' - 0"
None
16' - 0"
None
16' - 0"
None
14' - 6"
None
16' - 0"
None
----- ----- -----
18' - 0" OJ315 3x2 18' - 0"
None
18' - 0"
1 - 2x6
18' - 0"
1 - 2x6
18' - 0"
1 - 2x6
18' - 0"
None
18' - 0"
1 - 2x6
18' - 0"
1 - 2x6
16' - 1"
None
17' - 9"
None
----- ----- -----
20' - 0" OJ315 3x2 20' - 0"
1 - 2x6
20' - 0"
1 - 2x6
20' - 0"
2 - 2x6
18' - 7"
1 - 2x6
20' - 0"
1 - 2x6
19' - 9"
1 - 2x6
----- ----- ----- ----- ----- -----
OJ418S(10) 4x2 20' - 0"
None
20' - 0"
1 - 2x6
20' - 0"
1 - 2x6
20' - 0"
1 - 2x6
20' - 0"
None
20' - 0"
1 - 2x6
20' - 0"
1 - 2x6
----- 20' - 0"
None
----- ----- -----
22' - 0" OJ415 4x2 22' - 0"
1 - 2x6
22' - 0"
1 - 2x6
22' - 0"
2 - 2x6
21' - 8"
1 - 2x8
22' - 0"
1 - 2x6
22' - 0"
1 - 2x6
21' - 4"
2 - 2x6
----- ----- ----- ----- -----
24' - 0" OJ418 4x2 24' - 0"
1 - 2x6
24' - 0"
2 - 2x6
24' - 0"
2 - 2x8
22' - 11"
2 - 2x8
24' - 0"
1 - 2x6
24' - 0"
2 - 2x6
22' - 4"
2 - 2x6
----- ----- ----- ----- -----
26' - 0" 26' - 0"
2 - 2x6
26' - 0"
2 - 2x8
24' - 10"
2 - 2x8
----- 26' - 0"
2 - 2x6
25' - 1"
2 - 2x8
----- ----- ----- ----- ----- -----
16 6' - 0" OJ314 3x2 6' - 0"
None
6' - 0"
None
6' - 0"
None
6' - 0"
None
6' - 0"
None
6' - 0"
None
6' - 0"
None
6' - 0"
None
6' - 0"
None
6' - 0"
None
6' - 0"
None
6' - 0"
None
8' - 0" 8' - 0"
None
8' - 0"
None
8' - 0"
None
8' - 0"
None
8' - 0"
None
8' - 0"
None
8' - 0"
None
8' - 0"
None
8' - 0"
None
8' - 0"
None
8' - 0"
None
8' - 0"
None
10' - 0" 10' - 0"
None
10' - 0"
None
10' - 0"
None
10' - 0"
None
10' - 0"
None
10' - 0"
None
10' - 0"
Non
10' - 0"
None
10' - 0"
None
10' - 0"
Non
10' - 0"
None
10' - 0"
None
12' - 0" 12' - 0"
None
12' - 0"
None
12' - 0"
None
12' - 0"
None
12' - 0"
None
12' - 0"
None
12' - 0"
None
12' - 0"
None
12' - 0"
None
12' - 0"
None
12' - 0"
None
12' - 0"
None"
14' - 0" 14' - 0"
None
14' - 0"
None
14' - 0"
None
14' - 0"
None
14' - 0"
None
14' - 0"
None
14' - 0"
None
14' - 0"
None
14' - 0"
None
14' - 0"
None
13' - 8"
None
12' - 2"
None
16' - 0" 16' - 0"
None
16' - 0"
None
16' - 0"
None
16' - 0"
None
16' - 0"
None
16' - 0"
None
16' - 0"
None
15' - 6"
None
16' - 0"
None
14' - 11"
None
----- -----
18' - 0" OJ315 3x2 18' - 0"
None
18' - 0"
None
18' - 0"
1 - 2x6
18' - 0"
1 - 2x6
18' - 0"
None
18' - 0"
None
18' - 0"
1 - 2x6
17' - 4"
None
18' - 0"
None
16' - 9"
None
----- -----
20' - 0" OJ315 3x2 20' - 0"
1 - 2x6
20' - 0"
1 - 2x6
20' - 0"
1 - 2x6
20' - 0"
1 - 2x6
20' - 0"
1 - 2x6
20' - 0"
1 - 2x6
19' - 5"
1 - 2x6
----- 19' - 4"
None
----- ----- -----
OJ418S(10) 4x2 20' - 0"
None
20' - 0"
None
20' - 0"
1 - 2x6
20' - 0"
1 - 2x6
20' - 0"
None
20' - 0"
None
20' - 0"
1 - 2x6
20' - 0"
1 - 2x6
20' - 0"
None
18' - 10"
None
----- -----
22' - 0" OJ418 4x2 22' - 0"
None
22' - 0"
1 - 2x6
22' - 0"
1 - 2x6
22' - 0"
1 - 2x6
22' - 0"
None
22' - 0"
1 - 2x6
22' - 0"
1 - 2x6
20' - 2"
1 - 2x6
22' - 0"
None
----- ----- -----
24' - 0" 24' - 0"
1 - 2x6
24' - 0"
1 - 2x6
24' - 0"
2 - 2x6
24' - 0"
2 - 2x6
24' - 0"
1 - 2x6
24' - 0"
1 - 2x6
24' - 0"
2 - 2x6
----- 23' - 5"
1 - 2x6
----- ----- -----
26' - 0" 26' - 0"
1 - 2x6
26' - 0"
2 - 2x6
26' - 0"
1 - 2x8
25' - 5"
2 - 2x8
26' - 0"
1 - 2x6
26' - 0"
2 - 2x6
25' - 3"
1 - 2x8
----- ----- ----- ----- -----
28' - 0" OJ420 4x2 28' - 0"
2 - 2x6
28' - 0"
2 - 2x8
28' - 0"
1 - 2x10
26' - 3"
2 - 2x8
28' - 0"
2 - 2x6
28' - 0"
2 - 2x8
----- ----- ----- ----- ----- -----
30' - 0" 30' - 0"
2 - 2x8
30' - 0"
2 - 2x10
28' - 6"
2 - 2x10
----- 30' - 0"
2 - 2x8
28' - 8"
2 - 2x8
----- ----- ----- ----- ----- -----

Notes:

  1. Strongbacks must be installed at mid-span to achieve the maximum spans indicated for the vibration criterion in section 9.23.4.3.(2) of the National Building Code of Canada (NBC). The 2×4’s and 2×6’s are considered to be in SPF #3/stud and the 2×8’s and 2×10’s, in SPF #1/#2.
  2. The spans are based on simple-span joists.
  3. The minimum bearing length is 1 ½”, spans values in bold indicate that web stiffeners are required at the OSB end panel.
  4. The maximum span is measured o.c. of bearings and is based on uniformly loaded joists.
  5. Dead load deflection is limited to L/360 and total load deflection is limited to L/240.
  6. Live load deflection is limited to L/360.
  7. Spans are based on limit states design and comply with NBC and CAN/CSA-O86 requirements.
  8. Refer to the appropriate sections of the Specifier Guide for installation guidelines and construction details.
  9. The considered subfloor is a standard 19/32″ plywood or 1F20 OSB for 12″, 16″ and 19.2″ o.c. spacing and standard 23/32″ plywood or 1F24 OSB for 24″ o.c. spacing and must be glued with adhesive per CAN/CGSB-71.26-M88 and nailed per NBC.
  10. S = Limited inventory. Please contact your representative to determine quantities.