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I-Joist
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Depth of PRI-400 Joists
- APA Performance Rated I-Joists are identified by their depth in inches
followed by a designation such as PRI-30 which relates to the joist
strength and stiffness.
- The higher the number following the letters PRI, the greater the strength
and stiffness of the I-Joist.
| Net Depth |
Joist Designation |
| 9-1/2" (241 mm) |
PRI-20 |
| PRI-30 |
| PRI-40 |
| PRI-50 |
| PRI-60 |
| 11-7/8" (302 mm) |
PRI-20 |
| PRI-30 |
| PRI-40 |
| PRI-50 |
| PRI-60 |
| PRI-70 |
| PRI-80 |
| 14" (356 mm) |
PRI-40 |
| PRI-50 |
| PRI-60 |
| PRI-70 |
| PRI-80 |
| 16" (406 mm) |
PRI-40 |
| PRI-50 |
| PRI-60 |
| PRI-70 |
| PRI-80 |
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