WPC was the first type of deck wood alternative to become widely popular
and it’s still an excellent option today. Made of a 50/50 blend of wood
fibres and plastics, the most environmentally attractive examples are
made entirely from post-consumer recycled sources such as shopping bags
and ground up shipping pallets. WPCs are made by different companies and
come in one of two forms: either as hollow extrusions (less expensive
and lighter in weight) or solid lengths (looks and works more like real
wood). Both types come in the same widths and thicknesses as
conventional lumber.
Mineral-based composites (MBC) are a newer option for deck surfaces and offer distinct advantages. Made from a blend of plastic and minerals, the best MBCs have a fibrous structure similar to wood, with virtually no expansion and contraction from changes in temperature. Stronger than wood/plastic composites, being entirely inorganic means there’s no chance of rot and surface growths.