Plywood is commonly used as a substrate or base for Formica countertops. The plywood provides a stable and solid foundation for the Formica laminate to adhere to and helps to prevent warping or sagging of the countertop over time. It also helps to support the weight of heavy objects placed on the countertop.
Typically, a layer of plywood is attached to the top of the cabinets or the supporting structure, and then the Formica laminate is applied on top of the plywood using adhesive. The plywood should be smooth, clean, and free of any imperfections to ensure a proper installation.
It's important to note that the specific requirements for countertop construction may vary depending on the manufacturer's recommendations and local building codes. It's always a good idea to consult the installation instructions provided by the Formica manufacturer or seek advice from a professional installer to ensure the proper construction and installation of your Formica countertop.