There are four steps to Sizing Roof Drains.

Getting water off a building's roof is important, but how do you know what size drain to use to provide adequate drainage?It is easy to use tools from the International Plumbing Code.There are four steps to size the roof drain.

During a storm of one-hour duration and a 100 year return period, the rates of rainfall for various U.S. cities are provided in Appendix B.A storm with so much rain will only happen once in 100 years.The goal is to plan for the worst and be able to accommodate the typical amount of rain.

You can increase the number of roof drains to choose smaller diameter ones.In addition to the primary roof drain, there will also be overflow drain which are used for redundant and sized in the same manner.The higher the rim of the drain, the more distinguished it is.The size of the roof drain lines depends on the square feet of roof area being served by each drain.Half of the vertical walls must divert rain to the roof.It requires coordination with the building's architect to determine the exact roof area and number of drains.

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