There are several distinct kinds of roof water drains and roof drain scupper in Athens, AL and each is a specific approach to the wide range of roof styles and their drainage concerns. You need to consider the type of roof, its size, and its roof pitch to be able to pick the correct drain. You also may want to take into account the location of the drain, what amount of rainwater is expected and safe practices when choosing a roof drain for a house or business structure. Gable, dormer, mansard and hip roofs shed water thanks to gravitational force. Flat roofs, alternatively, accumulate water. Unless this water is directed out and away from the flat roof structure, it will most likely create pools of water that could eventually leak and the amassed weight will subsequently result in damage to the structure. That is the reason that roofs with a pitch of less than 2% should have roof drains situated in the lowest spots on the roof where water pools and should be uniformly spaced all throughout the roof top.
Roof Drain Types
There are several distinct variations of roof drains. They basically fall into 2 groups: pitched roof drains and flat roof drains. Pitched roof rainwater drains normally comprise gutters that accumulate rainwater which travels via gravity to the roof edge. Gutters transport this water in the direction of downspouts which steer the water flow down and far away from the building or into sewers. Flat roof drains are one of three main types: scuppers, inner drains or siphonic drains.
Roof Rainwater Drain Scuppes
Scuppers are situated on a roof's perimeter. Scuppers can also be put in on a balcony or terrace. Small openings are cut into the side of the roof structure so that water can empty and drain the roof top. Scuppers can hook up to a downspout, or can be lengthened to make sure that water is guided away from the structure sides and foundation.
Interior Roof Drains
There are many types of inner drains for flat roofs. These are installed at low spots on the roof and connect to interior drainage pipes that route water outdoors or into a sewer system. Many models of inner roof drains have domes, strainers or covers that prevent trash from obstructing the roof drain pipe. These kinds of drains operate via gravitational force channeling standing water thru the roof drain system. They can be made from PVC, cast iron or cast aluminum.
Siphonic Roof DrainsSiphonic roof drains are a more effective alternative to gravity drainage. Standard flat roof drainage permits both air and water to enter the drain system producing pipe space which is occupied by both air and water. By incorporating an engineered baffle to the sump of the drain body it produces a siphonic drain which removes air from the system and permits smaller sized pipe diameters to be used. When all air is removed, a negative air pressure in the tail portion of the drain is established which pulls rainwater off the roof siphonically. Though used mainly for flat roofs, siphonic drains can also be installed on pitched roofs.
If you need more information about flat roof drain or roof drain scupper in and around Athens, Alabama, give us a call. We'd be glad to help.