Plywood Core Types
Not all plywood cores are identical. The plywood core, situated between the outer wood veneers, varies in composition.
Different types of plywood utilize distinct cores to manage costs, enhance strength, or improve flexibility, catering to specific project needs. Typically, a veneer core suffices for most projects and is readily available at most home improvement stores.
Regardless of the core type, these panels always feature an exterior wood veneer, creating the impression of a single solid wood sheet:
Veneer Core
This is the most common type of plywood core, which consists of thin sheets of wood (veneer) glued together at opposing wood-grain angles on the same plane for increased strength.
For high-end applications or projects that will leave the laminated edges exposed, look for Baltic B-birch plywood or hardwood veneer plywood.
Veneer core plywood commonly has either 5 or 7 sheets of veneer. For stronger sheets less resistant to bending and warping, purchase 7-ply sheets. Some sheets used in heavy-duty applications can have as many as 13 ply or more.
Lumber core
This consists of edge-glued strips of wood with a wood veneer. This results in a stronger product that resists deflection (doesn't bend easily), which makes it great for long shelves. It is more expensive and can be hard to find.
MDF core
Not common for home construction, medium-density fiberboard (MDF) is commonly used in art projects and speaker boxes. It is heavy and has a uniform thickness, size, and appearance.
Particleboard core
This is the least expensive plywood core. It isn't very strong and is susceptible to water damage. It's best for inexpensive furniture and projects where strength isn't required.
