A “PVC” roof system is ideal for large, flat roofing such as those covering a supermarket or shopping mall. This PVC is the same material used in plumbing and is the third most widely produced plastic material in the world. During installation, each PVC sheet is mechanically attached to the roof deck and the subsequent sheet is adhered over the fasteners to create a monolithic surface. The material is manufactured in white, thus creating a reflective and energy-efficient roof.