Flat Roof Drainage System

In most cases a flat roof will pitch in a single direction where gutters can then catch the runoff to remove it.

Flat roof drainage system.

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. These ditches guide water toward the eavestroughs. There are roof coating products available if there isn t enough slant or slope to accomplish this. Of course the best designed flat roof has the correct amount of pitch to drain the water off naturally.

Internal drains constitute a common drainage system is most commercial buildings. Scuppers internal drains gutters. There are three types of drain systems commonly used on flat roofs. The one challenge with flat roofing is ensuring proper drainage.

The sketch at left common leak points at flat roof drainage systems. Each of these systems has its own pros and cons. Typically flat roof drainage systems fall into one of the following categories. Drainage ditches are created in the roof in the lower insulated areas.

These drains are like the drain at the. Poor drainage can lead to serious issues with flat roofing from leaks to structural damage. The drainage pipes are placed under the roof and in the walls of the building. The most critical of these issues is the flat roof drainage systems.

They are often positioned towards the center of the roof or the place where the slope of the roof allows water to collect. A gravity drainage system on a flat roof differs from the gutter system you find on residential roofs in two key ways. Your building and location can help determine which drain will fit your roof needs. Although not commonly used anymore the eavestrough drainage system is a good option if you have an older large industrial or commercial flat roof.

A flat roof may use interior drains to collect water from the centre of the roof. This kind of drainage system is most common on small flat roofs where water volume and buildup isn t extreme.