Concordia premium PE composite decking combines classic and on-trend colors and grain patterns with unbeatable performance. Available in three distinct collections: Astir, Horizon, and Symmetry. Durable composite core resists splintering, rotting, cracking, insects and decay. Four-sided PermaTech® cap layer provides superior protection and fade resistance. Premium PE material includes 94% recycled material. The flat-profile bottom provides a sturdy feel, reminiscent of traditional lumber. Finished surface on top and bottom is ideal for second-story decks. Reversible boards reduce waste and save time and money. Matching fascia and risers available in all colors. Riser boards create the back portion of stairs. They are installed at a 90° angle to the stair itself.