Plastic components for installation in tiled wet environments

A plastic component for use in a tiled wet environment can include a base structure comprising a first polymer material, and an integrated bonding interface formed on the base structure. The integrated bonding interface includes a second polymer material welded to or fused with the first polymer material of the base structure at a boundary area. A plurality of aggregate particles partially embedded in a mortar facing surface of the second polymer material to form a three-dimensional surface adapted for capturing or locking mortar material in one or more spaces on the integrated bonding interface between the aggregate particles.