One of OMG's specialties is the design and fabrication of custom drains. Though most new and retrofit roof drain installations conform to standard industry practices, there are the occasions when an unusual condition occurs at a drain location. In such instances, the standard drain may need to be modified or custom designed to fit the particular site conditions. If you have a special application, or would like a custom design drain, please give us a call at 800-633-3800 or download the Custom Drain Submittal Form available below in PDF format.