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Shear wall assemblies mark Wall Multiplier Factors 2.5-4.1. West Fraser’s OSB can be used for a variety of purposes including Shinkabe, Okabe and Yukagachi structures. It’s cost effective and easy to use. Construction company
OSB Specifications
| Application | JAS grade class | Thickness (mm) | Width (mm) | Length (mm) | Maximum span (mm) | Nail type / Nail spacing | |
|---|---|---|---|---|---|---|---|
| OSB dimensions and span ratings for post and beam construction | Low-bearing walls | 4 | 9.0 | 910 | 1820 2440 2730 3050 | 455 | N50 (CN50) 150mm |
| OSB dimensions and span ratings for platform-frame construction | Low-bearing walls | 4 | 9.0 | 910 | 1820 2440 2730 3050 | 455 | CN50 Perimeter spacing 100mm Intermediary spacing 200mm |
APA’s MLIT approved OSB Wall Multiply Factor (WMF) for Post and Beam Construction (Okabe)
| WMF | Nail type | Nail spacing (Perimeter spacing) | Nail spacing (Intermediary spacing) | OSB thickness | Notes | Space between horizontal structural members | Module | Face joint |
|---|---|---|---|---|---|---|---|---|
| 3.2 | CN50 | No more than 100mm | No more than 200mm | 9mm（Grade class 4） | Does not apply to yukagachi structures | 1715〜3075mm | 910 1000 | Possible |
| 4.1 | No more than 75mm | No more than 150mm | Does not apply to Yukagachi structures | |||||
| 3.8 | Only applies to Yukagachi Corbel: More than 27x60mm Nail type must be N75 or NZ75: no more than 200mm | 2625〜2945mm | 910 | Not possible | ||||
The Building Standard Law approved OSB Wall Multiply Factor (WMF) for Post and Beam Construction (Okabe)
| WMF | Nail type | Nail spacing (Perimeter spacing) | Nail spacing (Intermediary spacing) | OSB thickness | Notes | Space between horizontal structural members | Module | Face joint |
|---|---|---|---|---|---|---|---|---|
| 2.5 | N / NZ50 | No more than 150mm | No more than 150mm | More than 9mm (above grade class 4) | Corbel including Yukagachi structure: more than 30x40mm Same level or above as N75: no more than 200mm | – | – | – |
| 3.7 | No more than 75mm | No more than 150mm | More than 9mm (above grade class 4) | Corbel including Yukagachi structure: more than 30x60mm Same level or above as N75: no more than 120mm | – | – | – | |
Corbel including Yukagachi structure: more than 30x60mm Same level or above as N75: no more than 120mm
| WMF | Nail type | Nail spacing (Perimeter spacing) | Nail spacing (Intermediary spacing) | OSB thickness | Notes | Space between horizontal structural members | Module | Face joint |
|---|---|---|---|---|---|---|---|---|
| 3.4 | CN50 / CNZ50 | No more than 75mm | No more than 150mm | 9mm（Grade class 4） | Only applies to Yukagachi structures Corbel: More than 30x60mm Nail type must be N75 or NZ75: no more than 200mm Nail type must be N75 or NZ75 for horizontal structural members: no more than 150mm | 2518〜2856mm | 910（Pillars） | Not possible |
The Building Standard Law approved OSB Wall Multiply Factor (WMF) for Post and Beam Construction (Shinkabe)
| WMF | Nail type | Nail spacing (Perimeter spacing) | Nail spacing (Intermediary spacing) | OSB thickness | Notes | Space between horizontal structural members | Module | Face joint |
|---|---|---|---|---|---|---|---|---|
| 2.5 | N / NZ50 | No more than 150mm | No more than 150mm | 9mm (grade class 4) | Can be applied to structures including Yukagachi structures Corbel: More than 30x40mm Nail type must be same level or above as N75: no more than 300mm | – | – | – |
| 3.3 | No more than 75mm | No more than 150mm | 9mm (grade class 4) | Can be applied to structures including Yukagachi structures Corbel: More than 30x40mm Nail type must be same level or above as N75: no more than 200mm | – | – | – | |
APA’s MLIT approved OSB Wall Multiply Factors (WMF) for platform-frame (2×4) construction
| WMF | Nail type | Nail spacing (Perimeter spacing) | Nail spacing (Intermediary spacing) | OSB thickness | External dimensions of upper frame and bottom frame (height) |
|---|---|---|---|---|---|
| 3.6 | CN / NZ50 | No more than 75mm | No more than 150mm | 9mm（Grade class 4） | 1820〜2730mm |
| 4.7 | CN / NZ50 | No more than 50mm | No more than 100mm | 2440〜2745mm | |
The Building Standard Law approved OSB Wall Multiply Factors (WMF) for platform-frame construction
| WMF | Nail type | Nail spacing (Perimeter spacing) | Nail spacing (Intermediary spacing) | OSB thickness | External dimensions of upper frame and bottom frame (height) |
|---|---|---|---|---|---|
| 3.0 | CN / CNZ / BN50 | No more than 100mm | No more than 200mm | More than 9mm (grade class 4) | – |
| 3.7 | CN / CNZ50 | No more than 50mm | No more than 200mm | 9mm (grade class 4) | – |
| 3.6 | CN / CNZ65 | No more than 100mm | No more than 200mm | More than 12mm (grade class 3) | – |
| 4.8 | No more than 50mm | No more than 200mm | 12mm-28mm (grade class 3 – grade class 1) | – |
