The Stile Board System includes wall panels made of extruded polystyrene (XPS). These panels are the ultimate tile backer boards for all types of wall structures, including framed walls and solid brick or block walls. Available in various thicknesses and two sizes to suit different applications, these panels are lightweight, easy to cut, and handle. This makes them the perfect choice for a reliable and efficient wall tile backer board, ensuring durability and ease of installation in any construction project.