AA Thread has created a calculator app to help you find how many rolls are needed for a job with the proper over lap at each pipe connection. All you need to do is answer a few simple questions and punch in how many linear feet of ductile iron you are protecting. The app will tell you how many rolls of each product needed to cover the pipes and give you the proper over lap. It will also let you know the number of rolls of tape that should be used to secure it. Best of all this app will tell you how many skids are needed to ship and the estimated weight of the shipment. If you choose to you can request for a quote and someone will contact you shortly.