Early manufacturing processes for PVC decking faced high scrap rates, reportedly reaching up to 12%. Advances in technology and recycling have reduced this to below 2% in many factories.Still, commercial production remains complex, with some manufacturers reporting up to one-eighth of boards being cosmetically imperfect and unsellable. Producing PVC decking is a relatively difficult process called co-extrusion. During production, various stabilizers and colorants are added to the PVC granules, which are melted by the extruder and shaped into teak planks through a specialized mold. In the process, the
thermoplastic material is formed at high temperatures and then solidified in a cooling medium. The deck board core is coated and bound with an co-extruded protective cap layer, but the materials can be temperamental and hard to work with. Commercial production is challenging, not only for this reason, but also because about one eighth of the deck boards produced are considered unsellable and therefore scrapped. The fragile nature of this production process requires careful ingredient mixing and precise execution. The extruded planks need to be manually processed, glued together, caulked, and then adhered to the deck. The high labor requirement makes the process relatively expensive. Due to the desire for realism, it can only be automated to a limited extent. However, this method provides the installer with great flexibility, as these coverings have properties that make them highly shapeable, formable, and bendable. With the colors of the caulking, a great variety can be achieved. Some manufacturers offer caulking colors that can be selected from the
RAL color scale(a standardized European color matching system). ==Advantages==