The thickness of plywood used for countertops can vary depending on the type of countertop, the supporting structure, and the overall design. However, the most common thickness for plywood used in countertop construction is 3/4 inch (approximately 19 mm).
Here are some considerations for different countertop types:
Laminate Countertops: For standard laminate countertops, 3/4 inch plywood is commonly used as the substrate on which the laminate is glued. This thickness provides adequate support and stability for the laminate surface.
Butcher Block Countertops: Butcher block countertops, which consist of thick wood slabs, typically require a plywood base for added support. Again, 3/4 inch plywood is a common choice.
Tile Countertops: If you plan to install tile on your countertop, you may need to use a thicker plywood, such as 1 inch (approximately 25 mm). The additional thickness helps provide a sturdy base for the tiles and prevents flexing.
Concrete Overlay Countertops: For concrete overlay countertops, 3/4 inch plywood is generally suitable, as it will be covered with a concrete layer that adds strength and durability.
Keep in mind that these are general guidelines, and the specific requirements for your countertop project may vary. If you're unsure about the appropriate plywood thickness for your countertop design, it's best to consult with a professional or an experienced contractor who can provide personalized recommendations based on your specific needs and the weight the countertop will bear. Additionally, local building codes and regulations may also dictate certain requirements for countertop construction, so it's essential to check these before starting your project.