Deck: Wood or Plastic? : TreeHugger27 Jul 2009 ... The decision between composite decking and wood was by far the hardest part of the design process. ... wood can come from Forestry Stewardship Council certified forests or can be reclaimed wood from demolitions. wood can ... decking Material: composites. composite decking can range from fiberglass to plastic while most are a mixture of plastic and wood fibers. composite decking manufacturers claim long-term cost as the main advantage to using their product.