The owner's wanted a composite deck, and had a budget to stay within after having major remodeling work done inside the house. The solution was to only apply composite material to the horizontal surfaces (decking, rail cap, and stair treads). The deck The owner's wanted a composite deck, and had a budget to stay within after having major remodeling work done inside the house. The solution was to only apply composite material to the horizontal surfaces (decking, rail cap, and stair treads). The deck turned out to have a very interesting look and fit the space very well.