Types of Roof Drainage System

Accumulation of rainwater on a building’s rooftop can be hazardous for its structure if the water remains standing for longer duration. This is why, every building must have a roof drainage system to allow for the accumulated water to flow down the top of the building and pool in a reservoir or any other central collection point from which it can be reused or passed on further as per convenience and preference. There are several types of roof drainage systems being used at present in buildings around the world and these include the siphonic roof drainage system, gutters, scuppers and inner drains. Let us look at each of these in detail:

1.Gutters: These are the conventional system for roof drainage. Usually, they are found in pitched roofs and the rainwater glides into the gutter from the roof to be channeled into an underground reservoir or tank. The gutters work by action of gravity and are the most inexpensive option, which is why they are widely preferred. They also prevent the water from damaging the building, and entering the windows or seeping down into the walls and the foundation. However, gutters must be periodically cleaned to remove any debris from them which might obstruct the flow of water in them.

2.Scuppers: Another method used for rainwater drainage from flat roofs, parapets or terraces is the cutting of holes along the roof’s edges to drain the water. Rubber may be used to seal the edges of the holes to prevent the water seeping into the walls of the building. Scuppers are generally connected to down pipes which collect the rainwater and drain it into a reservoir or tank.

3.Inner drains: Another system for flat roofs is that of inner drains. These drains are cut into the lower sections of the roof and they connect to a down pipe which collects the rain water and takes it down to a reservoir or tank. These drains must also be cleaned regularly to prevent clogging and accumulation of debris.

4.Siphonic roof drainage system: One of the most sophisticated systems, siphonic roof drainage allows for maximum drainage. These drains reduce the need for down pipes as they suck the water out from the roof to remove it completely from the building and prevent any type of water damage.

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