Please make a selection to learn more: Advantages | Components | Application | Projects | Assistance JDR Enterprises, Inc. is a leading manufacturer and supplier of greenroof drain components. As the market for green roofing develops, the proper design and understanding of green roof components is imperative. JDR Enterprises, Inc. encourages greenroof technologies and will continue to do its part by providing key components for greenroofs. > J-DRain GRS Brochure > City Hall Case Sudy > Green Roof Booklet