Roof Drainage System Types

A typical commercial or multifamily residential building will utilize one of the following types of primary roof drainage.

Roof drainage system types.

This roof drainage system is very similar to a gutter and is also called a roof drain leader. Internal drains internal drains constitute a common drainage system is most commercial buildings. The first step in sizing a roof drain is to calculate the surface area of the roof that the. There are four main types of residential drainage systems.

This type of drain is usually composed of rain gutters. Scuppers a scupper is an opening in the sides of the walls that allows excess water to drain from flat rooftops of. The downspout drain should extend away from the walls and preferably direct the water to a storm sewer or catch basin. Distinguish among various types of low and steep slope drainage assemblies and identify design considerations for each system.

An advantage is that some come with roof drain covers which keeps unwanted debris from accumulating within the drain itself. 3 types of drainage for flat roofing systems 1. Identify the components of protected roof membrane assemblies prma vegetative roofs and traditional roofs. They are set up on an incline to help keep the collected water moving.

These are the most common in residential areas but commercial buildings can also have gutters installed on the. Inexpensive gutters are the easiest types of drain systems to get and install keeps water from pouring off of the roof in an uncontrollable manner protects doorways and window openings. The four types of drain systems gutters. Roof water drain types and sizing sizing a roof water drain.

This is a more high tech drain that acts as a sort of vacuum by using an air baffle which pushes the water into the pipes while not allowing much air into them. Rain gutters are the most common drain system in use for all types of roofs. 1 gravity drainage a gravity drainage system simply relies on gravity to move the water from the rooftop to the ground. These will drain to somewhere near the center of the roof and down through the building to underground storm mains or a detention pond.

Conventional gutter systems such as those used on most houses are suitable for some low slope roofs. This form of roof drainage is preferred if a clean exterior appearance is desired. While each drainage system will be different to best accommodate the roof it drains there are only two primary drainage systems that are suitable for commercial flat roofs or low slope roofs. The advantage of this system is that the water drains more.

Surface subsurface slope downspout and gutters.