What is the Minimum Slope Needed for a Flat Roof?

Greg PalyaSpray Polyurethane Foam Roofing

Quick Answer: Industry standards require no water area to exceed 100 square feet at ½” deep after 24 hours of dry conditions. Perhaps you’re wondering how commercial roofing contractors install the right amount of slope. In this article, we’ll cover: And just so you’re aware, West Roofing Systems has been in commercial roofing since 1979. We’ve seen millions and millions …