Comparison of APA’s Structural OSB Panels
‘Structural I’ on an APA trademark for OSB sheathing and Sturd-I-Floor indicates that it is a performance-rated panel, compared to basic rated panels. It also denotes that it meets the specific requirements of US Performance Standard PS 2 for cross-panel strength and stiffness in bending and racking load performance.
The further the supports are spaced, the thicker the panel may have to be. Our comparison tables below show the superior bending stiffness and strength for OSB Structural I sheathing and Sturd-I-Floor. Click on the link you need. For more technical information on span ratings and performance categories for OSB panels, see here .
Roof and subfloor sheathing: comparing OSB Rated Structural 1 panel and basic OSB Rated Sheathing
- OSB Bending Stiffness EI (lb-in²/ft of panel width)
- OSB Bending Strength F S (lb-in²/ft of panel width)
Flooring: comparing OSB Structural I panel with with basic OSB Rated Sturd-I-Floor
Bending Stiffness Comparison, Sheathing
| STRESS APPLIED PARALLEL TO STRENGTH AXIS1 | STRESS APPLIED PERPENDICULAR TO STRENGTH AXIS1 | SPAN RATING | PERFORMANCE CATEGORY | PREDOMINANT THICKNESS LABEL | ||
|---|---|---|---|---|---|---|
| Rated Sheathing | Structural I Sheathing | Rated Sheathing | Structural I Sheathing | |||
| 60,000 | 60,000 | 11,000 | 17,600 | Roof-24 | 3/8 | 0.354 IN |
| 78,000 | 78,000 | 16,000 | 25,600 | Roof-24 Subfloor-16 | 7/16 | 0.418 IN |
| 115,000 | 115,000 | 25,000 | 40,000 | Roof-32 Subfloor-16 | 15/32 | 0.451 IN |
| 225,000 | 225,000 | 56,000 | 89,600 | Roof-40 Subfloor-20 | 19/32 | 0.578 IN |
| 400,000 | 400,000 | 91,500 | 146,600 | Roof-48 Subfloor-24 | 23/32 | 0.704 IN |
| Note:¹ The strength axis is parallel to the face and back orientation of the strands unless otherwise indicated. | ||||||
Bending Strength F S (lb-in²/ft of panel width)
| STRESS APPLIED PARALLEL TO STRENGTH AXIS1 | STRESS APPLIED PERPENDICULAR TO STRENGTH AXIS1 | SPAN RATING | PERFORMANCE CATEGORY | PREDOMINANT THICKNESS LABEL | ||
|---|---|---|---|---|---|---|
| Rated Sheathing | Structural I Sheathing | Rated Sheathing | Structural I Sheathing | |||
| 300 | 300 | 97 | 145.5 | Roof-24 | 3/8 | 0.354 IN |
| 385 | 385 | 115 | 172.5 | Roof-24 Subfloor-16 | 7/16 | 0.418 IN |
| 445 | 445 | 165 | 247.5 | Roof-32 Subfloor-16 | 15/32 | 0.451 IN |
| 750 | 750 | 270 | 405 | Roof-40 Subfloor-20 | 19/32 | 0.578 IN |
| 1,000 | 1,000 | 405 | 607.5 | Roof-48 Subfloor-24 | 23/32 | 0.704 IN |
| Note: 1 The strength axis is parallel to the face and back orientation of the strands unless otherwise indicated. | ||||||
Sturd-I-Floor comparisons – OSB Bending Stiffness EI (lb-in²/ft of panel width)
| STRESS APPLIED PARALLEL TO STRENGTH AXIS1 | STRESS APPLIED PERPENDICULAR TO STRENGTH AXIS1 | SPAN RATING | PERFORMANCE CATEGORY | PREDOMINANT THICKNESS LABEL | ||
|---|---|---|---|---|---|---|
| Rated Sheathing | Structural I Sheathing | Rated Sheathing | Structural I Sheathing | |||
| 150,000 | 150,000 | 34,000 | 54,400 | 16 oc | 19/32 | 0.578 IN |
| 210,000 | 210,000 | 40,500 | 64,800 | 20 oc | 19/32 | 0.578 IN |
| 300,000 | 300,000 | 80,500 | 128,800 | 24 oc | 23/32 | 0.704 IN |
| 650,000 | 650,000 | 235,000 | 376,000 | 32 oc | 7/8 | 0.849 IN |
| 1,150,000 | 1,150,000 | 495,000 | 792,000 | 48 oc | 1-1/8 | 0.1.091 IN |
| Note:1 The strength axis is parallel to the face and back orientation of the strands unless otherwise indicated. | ||||||
Bending Strength F S (lb-in²/ft of panel width)
| STRESS APPLIED PARALLEL TO STRENGTH AXIS1 | STRESS APPLIED PERPENDICULAR TO STRENGTH AXIS1 | SPAN RATING | PERFORMANCE CATEGORY | PREDOMINANT THICKNESS LABEL | ||
|---|---|---|---|---|---|---|
| Rated Sheathing | Structural I Sheathing | Rated Sheathing | Structural I Sheathing | |||
| 500 | 500 | 180 | 270 | 16 oc | 19/32 | 0.578 IN |
| 575 | 575 | 250 | 375 | 20 oc | 19/32 | 0.578 IN |
| 770 | 770 | 385 | 577.5 | 24 oc | 23/32 | 0.704 IN |
| 1,050 | 1,050 | 685 | 1,027.5 | 32 oc | 7/8 | 0.849 IN |
| 1,900 | 1,900 | 1,200 | 1,800 | 48 oc | 1-1/8 | 0.1.091 IN |
| Note:1 The strength axis is parallel to the face and back orientation of the strands unless otherwise indicated. | ||||||