Roof Drains


At this time there are a few distinct varieties of roof drains and roof drain pan in Florence, AL and each is an unique approach to the wide range of roof types and their drainage concerns. You need to look at the kind of roof, its dimensions, and the roof pitch to be able to select the right drain. You also may want to think about the site of the drain, how much rainwater is expected and safety when selecting a roof water drain for a residence or commercial structure.

Gambrel, dormers, hip and gable roofs shed water thanks to gravity. Flat roofs, on the other hand, accumulate water. Until the water is routed out and away from the flat roof , it will most likely create pools that may inevitably leak and the accumulated weight will subsequently result in structural damage. That is why roofs with a slope of below two percent should have roof drains situated in the lowest places on the roof where water puddles and should be evenly spread throughout the roof top.

Roof Drain Kinds


There are several distinct alternatives of roof drains. They basically fall into two categories: flat roof drains and pitched roof drains. Pitched roof drains usually consist of gutters that accumulate rainwater which travels by means of gravity to the roof periphery. Gutters transport 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 main types: scuppers, inner drains or siphonic drains.

Roof Drain Scuppers


Scuppers are situated on a roof's perimeter. They can also be placed on a balcony or terrace. Small openings are cut into the side of the roof structure so rain water can empty and drain the roof surface. Scuppers can hook up to a downspout, or can be lengthened to make sure that water is guided off of the structure sides and foundation.

Interior Roof Drains


There are many kinds of inner drains for flat roofs. They are positioned at low places in the roof and connect to interior drainage pipes that route water outdoors or into a sewer system. Many models of internal roof drains have domes, strainers or covers which prevent trash from clogging the roof drain pipe. These kinds of drains work via gravitational force funneling pooling water through the roof drain system. They can be 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 adding an engineered baffle to the sump of the drain system it produces a siphonic drain which removes air from the system and permits smaller sized pipe diameters to be used. When all of the air is removed, a negative air pressure in the tail portion of the drain is established which pulls rainwater 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 pan in and around Florence, Alabama, give us a call. We'd be glad to help.