IPC provides four steps to size the roof drains on a building: Select number of roof drains and calculate the roof area sloped to each drain. Zurn manufactures a complete line of roof drains including combination-primary overflow, control flow, dual outlet, siphonic, retrofit and more. This versatile drain readily adapts to changes in finished roof elevation. With LEVELEZE® JOSAM Roof Drains feature JIFFEE-SET connections with MULTI -.

Zurn manufactures a complete line of roof drains including combination-primary overflow, control flow, dual outlet, siphonic, retrofit and more. IPC provides four steps to size the roof drains on a building: Select number of roof drains and calculate the roof area sloped to each drain. The Heart of the Controlled Flow Roof Drainage System, The Accuflow Weir possible to calculate the number of gallons per minute (GPM) need to be drained . Calculate the total roof area by multiplying its length by width. This table is based on Zurn's Roof Drain Vertical Requirement for Horizontal Roof Areas at. ZURN PLUMBING PRODUCTS GROUP SPECIFICATION DRAINAGE OPERATION, PITTSBURGH AVENUE, ERIE, PA ROOF DRAIN VERTICAL REQUIREMENT FOR HORIZONTAL. ROOF Step 1: A. Calculate total roof area. Options and Variations/Common Roof Drain Accessories Z High Capacity 20" Diameter Main Roof Drain Control-Flo Roof Drainage System Canadian. Drain Calculator. Factors which affect proper roof drainage are deck slope, drain size, and placement of drains. The full flow capacity of a drain is not realized. leader size decreases the number of drains required. STEP-BY-STEP SIZING OF ZURN DRAINS. Step 1: A. Calculate total roof area. Example: Roof area is The modern roof drain is designed to drain off rainwater in the most effec- tive manner possible while Calculate the total roof area. 2. Determine the maximum . This versatile drain readily adapts to changes in finished roof elevation. With LEVELEZE® JOSAM Roof Drains feature JIFFEE-SET connections with MULTI -.