At this time there are a number of distinct types of roof drains and roof drain cover in Opelika, AL and each is a specific answer to the variety of roof styles and their drainage concerns. You should consider the kind of roof, its size, and its roof pitch to be able to select the right drain. You also need to take into consideration the location of the drain, what amount of rainwater is anticipated and safety when choosing a roof water drain for a residence or business structure. Gable, dormer, mansard and hip roofs shed water because of gravity. Flat roofs, conversely, accumulate water. Until this water is directed out and away from the roof structure, it will develop pools of water that may inevitably leak and the amassed weight may eventually cause damage to the structure. That is why roofs with a slope of under 2% should have roof drains situated in the lowest spots on the roof in which water puddles and should be evenly spaced all throughout the roof surface.
Types of Roof Drains
There are several distinct variations of roof drains. They generally fall into 2 categories: pitched roof drains and flat roof drains. Pitched roof drains usually consist of gutters that accumulate rainwater which passes by means of gravity to the roof edge. Gutters channel this water towards downspouts which direct the water flow down and far away from the building or into sewers. Flat roof drains are one of three primary types: scuppers, inner drains or siphonic drains.
Roof Drain Scuppers
Scuppers are situated on the roof's perimeter. They can also be placed on a balcony or terrace. Small openings are cut in the side of the roof structure so that water can empty and drain the roof top. Scuppers can attach to a downspout, or could be extended so that water is directed off of the building sides and foundation.
Interior Roof Drains
There are quite a few different kinds of inner drains for flat roofs. These are installed at low places in the roof and connect to inner drainage pipes that drive water outdoors or into a sewer system. Many designs of internal roof drains have domes, strainers or covers that prevent trash from obstructing the roof drain pipe. These types of drains operate via gravity funneling standing water thru the roof drain system. They are constructed from PVC, cast iron or cast aluminum.
Siphonic Roof DrainsSiphonic roof drains are a more efficient substitute for gravity drainage. Traditional flat roof drainage allows both air and water to enter the drain system creating pipe space which is occupied by both air and water. By incorporating an engineered baffle to the sump of the drain body it creates a siphonic drain that removes air from the system and allows for smaller pipe diameters . When all air is removed, a negative air pressure in the tail piece of the drain is set up which draws rainwater off the roof siphonically. Although used primarily for flat roofs, siphonic drains can also be installed on angled roofs.
If you need more information about flat roof drain or roof drain cover in and around Opelika, Alabama, give us a call. We'd be glad to help.