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Plywood and OSB are both wood-based sheet materials, but their construction and surface characteristics are different. That difference matters when the material is considered for concrete formwork.
What Is Plywood?
Plywood is made from thin timber veneers bonded in alternating grain directions. Formwork-grade products can have a film-coated surface designed for concrete contact.
See What Is Film-Faced Plywood?.
What Is OSB?
OSB is made from oriented wood strands bonded under pressure. It is used in roofing, wall, floor, packaging and other structural or construction applications depending on product grade.
Plywood vs OSB
| Feature | Plywood | OSB |
|---|---|---|
| Construction | Layered timber veneers | Oriented wood strands |
| Surface | Film-faced types can provide a smoother coated face | Strand texture is more visible |
| Concrete formwork | Film-faced formwork plywood is widely used for this purpose | Standard OSB does not have the same facing structure |
| Moisture behavior | Depends on grade, film and edge protection | Depends on grade and exposure conditions |
Where Does Plastic Plywood Fit?
Plastic plywood has a polymer-based body rather than a timber-veneer or wood-strand structure. It is therefore a separate formwork-facing alternative.
See What Is Plastic Plywood? and Plastic Plywood vs Plywood: Cost per Use.