The Excelsior Lumber is best known for fiberon composite decking supplier in Morris County. Fiberon is an award-winning manufacturer of high-quality, eco-friendly composite decking, railing and fencing. Kaslander Lumber carries a variety of Fiberon products. Kaslander stocks the colors Cinnabar and Burnt Umber from the Symmetry line; the colors Cabin and Villa from the Good Life line; and white from the railing Mission line.