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Structural I, also referred to as “STRUC I,” may be OSB or plywood and is, essentially, a subcategory of APA Rated Sheathing. Panels designated Structural I must meet all of the manufacturing and performance standards of Rated Sheathing, as well as certain additional requirements.
- Diaphragms and Shear Walls
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- Diaphragms and Shear Walls
Highlights. 4-ply plywood construction. Can be nailed directly to framing - wall studs and roof or floor joists. Storage in a warehouse or under roof is recommended prior to use; if stored outdoors, units should be off the ground and covered loosely with some type of protective material.
However, using fewer supports with thicker panels—e.g., Performance Category 23/32 panels with a span rating of 48/24 over framing 48 inches on center—is also cost effective for long-span flat or pitched roofs. Recommended live loads are given in Table 34. Nailing recommendations are given in Table 36.
Specifications. APA Rated Sheathing & Structural 1 Sheathing. Materials and Fabrication • Use of third-party certified wood from well managed forests to pro-duce all of LP’s wood–based products.
2.2 Structural I. APA Rated Sheathing may be produced as Structural I 5.0 Specification. Sheathing, which provides enhanced racking and cross-panel strength properties for certain demanding applications such as designed shear walls, diaphragms, and panelized roofs. May not be locally available.
This 15/32 in. 4 ft. x 10 ft. Fir Structural 1 Plywood features all-natural wood. This plywood sheathing can be painted or stained. Structural 1 Plywood is construction grade plywood used mostly for structural.
The most common wood structural panel installed in typical floor applications is 23/32—inch thick, installed at 24 inches on center, and used as a combination subfloor-underlayment (Figures 10a and 10b). With supports at 24 inches on-center or less, these panels provide a strong, stiff, and solid surface on which different types of finish