I am using the Dayton Turf on a roof deck with a drainage tile underneath. Do I need to use infill for this and if so, how much for 460 sq feet?

With our Daytona Turf Rolls or any artificial grass, you don't have to add infill. You can install the turf without it. The infill just helps to keep the turf blades standing up and aids in drainage. Please use the flooring calculator on any of our infill product pages to calculate how much infill you would need for your space. Typically, a 50lb bag of infill covers approximately 33sq ft.