What is Composite Decking? Plastic and wood fibers are mixed together and melted to create a decking material. Deckorators brand offers a premium grade PVC & limestone composition, separating it from its competitors. Composite combines the best features of each material; plastic keeps moisture out of the wood, and wood helps control the contraction and expansion of the plastic. Composite Decking never needs painting, staining or sealing. It will never warp, split, rot or peel. It is splinter free and in most cases slip resistant.