Structural 1, APA-Rated OSB Sheathing and Sturd I -Floor – Technical Overview
APA’s technical specification overview compares the three main types of APA OSB panels – Rated OSB Sheathing, Structural 1 and APA Rated Sturd I -Floor. It gives data for the most common performance categories, span ratings, and thickness tolerances.
See how this info appears on APA OSB trademarked panels. When you see Structural I’ on an APA trademark for OSB sheathing and Sturd-I-Floor it denotes a performance-rated panel, with superior bending stiffness and strength. See more on its strength benefits.
| PERF CAT | APA RATED
SHEATHING |
STRUCTURAL 1 | APA RATED STURD I-FLOOR | Specific Tolerances in PS2 and Recommended Thickness denoted on APA Trademarked Panels | ||
|---|---|---|---|---|---|---|
| On standard/ trademarked panel | Span Rating | Span Rating | Span Rating | Min Thickness (In) |
Max Thickness (In) |
Recommended thickness (in)
|
| 3/8 | Wall 16 oc/ Wall 24 oc/ 24/0 | 24/0 | N/A | 0.344 | 0.406 | 0.354 |
| 7/16 | Wall 16 oc/ Wall 24 oc/ 24/16 | 24/16 | N/A | 0.406 | 0.469 | 0.418 |
| 15/32 | 32/16 | 32/16 | N/A | 0.438 | 0.500 | 0.451 |
| 1/2 | 32/16 | 32/16 | N/A | 0.469 | 0.531 | 0.483 |
| 19/32 | 40/20 | 40/20 | 16 oc/ 20 oc | 0.563 | 0.624 | 0.578 |
| 5/8 | 40/20 | 40/20 | 16 oc/20 oc | 0.594 | 0.656 | 0.609 |
| 23/32 | 48/24 | 48/24 | 24 oc | 0.688 | 0.750 | 0.703 |
| 3/4 | 48/24 | 48/24 | 24 oc | 0.719 | 0.781 | 0.734 |
| 7/8 | 60/32 | N/A | 24oc/ 32 oc | 0.831 | 0.919 | 0.849 |
| 5/16 | 12/0, 16/0, 20/0 | N/A | N/A | 0.281 | 0.344 | 0.289 |
| 1-1/8 | N/A | N/A | 48 oc | 1.069 | 1.181 | 1.091 |