Roof Drains


There are several different kinds of roof drains and roof drain pan in Dothan, AL and each is a specific answer to the variety of roof styles and their drainage concerns. You should consider the type of roof, its size, and its roof pitch to be able to pick the most suitable drain. You also should think about the site of the drain, how much rainwater is expected and safe practices when choosing a roof water drain for a home or business building.

Gambrel, dormers, hip and gable roofs shed water because of gravity. Flat roofs, alternatively, collect water. Unless the water is directed out and away from the flat roof structure, it will most likely develop pools that could eventually leak and the amassed weight will subsequently cause compromising the integrity of the structure. That is why roofs with a slope of under 2% ought to have roof drains positioned in the lowest places on the roof in which water puddles and should be uniformly spaced all throughout the roof top.

Kinds of Roof Drains


There are a number of distinct variations of roof drains. They basically fall into 2 groups: flat roof drains and pitched roof drains. Pitched roof rainwater drains normally comprise gutters which accumulate rainwater that passes via gravity to the roof edge. Gutters direct this water in the direction of downspouts which direct the water flow down and far away from the building or in to sewer lines. Flat roof drains can be one of three primary types: scuppers, inner drains or siphonic drains.

Roof Rainwater Drain Scuppes


Scuppers are located on a roof's periphery. They can also be installed 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 connect to a downspout, or could be extended so that water is directed away from the building sides and foundation.

Inner Roof Drains


There are many kinds of inner drains for flat roofs. These are positioned at low places in the roof and connect to interior drainage pipes that direct water outside or into a sewer system. Several styles of inner roof drains have domes, strainers or covers which prevent trash from clogging the roof drain pipe. These types of drains operate via gravity channeling pooling water thru the roof drain system. They can be made from PVC, cast iron or cast aluminum.

Siphonic Roof Drains

Siphonic roof drains are a more efficient alternative to 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 system it produces a siphonic drain which removes air from the system and permits smaller pipe diameters . When all of the air is removed, a negative air pressure in the tail portion of the drain is set up which pulls 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 pan in and around Dothan, Alabama, give us a call. We'd be glad to help.