Flat Roof Drainage Plan

Check for possible tears or punctures that could have been caused by workmen during snow shoveling if there has been a lot of repairs done around the drain area it s time to.

Flat roof drainage plan.

A major maintenance issue shared between all types of roof drains is debris removal. Unlike other roofing types that are slanted or sloped to allow water to drain automatically flat roofs need a built in drainage system to help remove moisture and debris. Poor drainage can lead to serious issues with flat roofing from leaks to structural damage. There are roof coating products available if there isn t enough slant or slope to accomplish this.

The one challenge with flat roofing is ensuring proper drainage. There are three types of drain systems commonly used on flat roofs. Of course the best designed flat roof has the correct amount of pitch to drain the water off naturally. The drains are often topped by a strainer that prevents leaves and debris from getting into the pipes.

This drainage system is composed of drains placed at intervals near the center of the roof and an internal network of gutters and pipes that move the water to the exterior of the building. Each of these systems has its own pros and cons. Determine 100 year 1 hour rainfall rate used for location of building. Your building and location can help determine which drain will fit your roof needs.

Select number of roof drains and calculate the roof area sloped to each drain. Using tools from the international plumbing code ipc it s not that hard. Ipc provides four steps to size the roof drains on a building. These are the three types of drainage systems that work best for flat roofs.

Size horizontal storm drainage piping. Inspect the current roof drain s and the drain line through the building for leaks and assure that the materials are.