Low maintenance deck materials have become very popular in recent years. Most of these materials are composed out of a formula including plastics. Plastic lumber’s composition varies widely, from 100% post-consumer recycled content to 100% virgin plastic resin. Some products are made with a single plastic resin, others use combinations of resins, and still others combine other materials with plastic to make a composite. Most plastic lumber products on the market are made from polyethylene. Some manufacturers are also using polystyrene and polyvinyl chloride (PVC).
Products that use recycled plastic are the best for the environment because they are keeping plastic waste out of our landfills. Plastic decking does not require staining like wood materials. However plastic will expand and contract in extreme temperatures. You should always space plastic decking to prevent buckling.