Please note that this tool is a simple estimation measure. This is not meant to give you a final amount of silicone needed for your project. Rather, it is meant to help you get an idea for how much product you may need on a roof. Every roof is different and there are always factors that go into accurately quoting silicone roofing jobs that cannot be determined by a simple equation. To learn more about how to accurately quote a PM Silicone roof restoration job, please fill out the form below. PM Silicone is not responsible for any quoting based on this product calculator.