Fiberglass is a well-known and familiar material among boat builders and boat repair specialists. So for builders and remodelers who work near the water, it also seems like an obvious choice for a durable walking surface on a deck over living space. Cape May, New Jersey contractor Nathaniel Eldon says it's a common solution in his market. In this detailed story, Eldon explains how to frame the tapered roof, build a parapet complete with drainage scuppers, and apply the underlayment for the fiberglass surface. Then he describes how his local fiberglass contractor builds up the layers of reinforcing fiber, polyester resin, and protective gelcoat to create the smooth, durable walking surface.