Made of materials that include recycled and new plastic, bamboo, and wood fibers, these synthetic or composite decking products have evolved as an essential alternative where green or eco-conscious materials are desired, such as LEED-qualified or certified construction. It is typically used only for surface decking or visible railing parts, not structural components. Although composite lumber is usually denser and heavier than natural wood lumber, it does not have the structural strength of wood. Some synthetic or composite lumber is hollow, requiring end-caps to cover the ends of boards, while others are dense, solid boards that are cut and fitted like lumber boards used for decking. Two types of manufacturing processes are used: compression molding which creates solid planks and extrusion processes which form planks by pressing raw materials through shaping molds. So-called composite decking comes in several forms, from solid PVC plastic boards to solid composites using 100 percent recycled plastics to products that blend plastics and natural wood or bamboo fibers. With natural lumber supplies dwindling-especially for the types of lumber with natural resistance to decay and pests, such as redwood, cedar, and teak- composite decking is becoming an increasingly popular choice for decks and other outdoor structures. The Spruce Home Improvement Review Board.
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