Roof Drainage System Definition

Green roof solutions offers many different drainage layer options depending on system goals regarding water retention.

Roof drainage system definition.

Inner roof drains are used on flat roofs and include a low section or channel that collects water and feeds it into a concealed drain that leads to an underground drainage system. The main benefit of inner drains is that the system is hidden from view. Roof drains are usually cast iron metal or a synthetic material that includes a grate to prevent solids branches debris to drain down the roofing drainage system. From the very dawn of building construction it has been necessary to incorporate some method of gathering and discharging rainwater from the roof of a structure.

The most critical role of the drainage layer is to provide an adequate flow of water off the roof during and after rainfall. Roof drainage is one of the fundamental considerations of building design. All exterior claddings pass some rainwater. If a scupper is part of the overflow system then it will be a few inches typically two inches above the roof surface.

By contrast a siphonic roof drainage system contains an anti vortex plate that acts as a restrain and prevents air and debris from entering the piping system at full flow allowing the pipes to completely fill up with water. Middle east plastic pipe market to see rapid growth to 2020. A drain that is installed within the roofing systems of a structure. Drainage planes are used in the design and construction of building enclosures to control rain.

Controlling rain is the single most important factor in the design and construction of durable buildings and in the control of mold. Inner drains are resistant to freezing but can require careful maintenance to prevent problems. Normally roof drains are required in flat or semi flat roofs and not in pitched roofs. In contrast a roof drain is a method of draining a roof assembly where the water runoff from the roof is transferred through the roof drain into piping that runs through the interior of the building before it empties either onto grade or into a storm sewer.

The design of the different drainage layers allows for a portion of the stormwater to be retained above where the water is allowed to flow freely off of the roof. While the various layers of the roof assembly play a key role in keeping moisture from infiltrating into the interior adequate weather protection also depends on the roof s ability to drain moisture away from the building. A scupper is a drainage point on the edge of the roof. Siding leaks brick leaks stucco leaks stone leaks etc.

They are incorporated into the walls or parapet.