When selecting the proper screw length for 3/4″ plywood, it’s essential to ensure that the screw is long enough to provide a secure hold without going all the way through the material. A general guideline is:
- For attaching 3/4″ plywood to wood framing (e.g., 2x4s), a screw length of 1 1/4″ to 1 1/2″ is typically recommended. This allows the screw to penetrate deeply into the underlying wood without breaking through the surface of the plywood.
- For attaching plywood to another sheet of plywood, a screw length of 1″ is usually sufficient to ensure a good hold, as long as the screws do not go too deep.
When choosing screws, also consider the type of screw (e.g., wood screws, drywall screws, etc.) and the material you’re screwing into. If the plywood is part of a project where aesthetics matter, using screws with a smaller head or counter-sinking the screws might be necessary to avoid visible marks.
