Roof Drains


There are several distinct types of roof water drains and roof drain dome in Bessemer, AL and each one is a specific answer to the variety of roof types and their drainage concerns. You must think about the kind of roof, its dimensions, and its roof pitch to be able to choose the right drain. You also should take into account the site of the drain, how much rainwater is anticipated and safe practices when selecting a roof drain for a residence or business building.

Hip roofs, dormers, gable and mansard roofs shed water because of gravitational force. Flat roofs, conversely, accumulate rain water. Until this water is routed out and away from the roof structure, it will most likely create pools that may inevitably leak and the amassed weight will eventually result in structural damage. That is why roofs with a slope of below 2% should have roof drains located at the lowest places on the roof where water puddles and need to be uniformly spread throughout the roof surface.

Roof Drain Types


There are several distinct variations of roof drains. They basically fall into 2 groups: flat roof drains and pitched roof drains. Pitched roof rainwater drains normally consist of gutters that accumulate rainwater which travels by means of gravity to the roof edge. Gutters direct this water in the direction of downspouts which steer the water flow down and away from the structure or in to sewer lines. Flat roof drains are one of three primary types: scuppers, inner drains or siphonic drains.

Roof Rainwater Drain Scuppes


Scuppers are situated on the roof's perimeter. Scuppers can also be installed on a balcony or terrace. Small openings are cut into the side of the roof structure so that water can flow out and drain the roof top. Scuppers can hook up to a downspout, or could be extended so that water is directed away from the structure sides and foundation.

Inner Roof Drains


There are quite a few different kinds of inner drains for flat roofs. These are positioned at low areas on the roof and connect to inner drainage pipes that route water outdoors or into a sewer system. Several versions of internal roof drains have domes, strainers or covers which prevent trash from blocking the roof drain pipe. These types of drains operate via gravity channeling pooling water thru the roof drain system. They are made from PVC, cast iron or cast aluminum.

Siphonic Roof Drains

Siphonic roof drains are a more effective alternative to gravity drainage. Conventional flat roof drainage allows 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 system it creates a siphonic drain that eliminates air from the system and allows for smaller pipe diameters to be used. When all of the air is eliminated, a negative air pressure in the tail piece of the drain is established which attracts water off the roof siphonically. Although 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 dome in and around Bessemer, Alabama, give us a call. We'd be glad to help.