What is the Difference Between Extruded and Molded Plastic Lumber?

Lumber from recycled plastic can be produced in one of two ways, through an extrusion process or by using a mold. Most plastic lumber boards and trim are extruded, and are used as replacements for floor boards or base boards/crown molding, in ways that avoid high pressure/weight or for decorative purposes.

Molded plastic lumber is heavy-duty and is designed for installations that can stand up to greater weight, such as deck posts and furniture. When installed properly, it can be used for load-bearing purposes.

Typically, molded lumber is formed in the final dimensions needed for a construction project. While it can be shaped in the same way and with the same tools as one would use for woodworking, it is most often ordered in the exact sizes and dimensions required for a specific project.