What are the black spots on my composite deck?
Composite is made from particles of wood, PVC, and plastics. The wood particles are untreated before they are mixed with the other components. By not treating them they are susceptible to mold and mildew growth in the deck. Even after the deck is cleaned they mold growth may come back quickly. We have found customers with composite decking ask for their deck to be cleaned more frequently so we have offered a maintenance program for composite decks.
