Roof Drains


There are a number of distinct varieties of roof drains and cast iron roof drain in Saraland, AL and each one is a specific solution to the wide range of roof styles and their drainage issues. You need to look at the type of roof, its dimensions, and the roof pitch to be able to choose the correct drain. You also may want to think about the location of the drain, how much rainwater is expected and safety when selecting a roof drain for a house or business building.

Gable, dormer, mansard and hip roofs shed rainwater water because of gravity. Flat roofs, on the other hand, accumulate rain water. Until the water is guided out and away from the flat roof structure, it will most likely develop pools of water that could eventually leak and the accumulated weight will subsequently result in compromising the integrity of the structure. That is the reason that roofs with a pitch of less than two percent ought to have roof drains positioned at the lowest places on the roof in which water pools and need to be uniformly spaced all throughout the roof top.

Roof Drain Kinds


There are several different variations of roof drains. They generally fall into two groups: flat roof drains and pitched roof drains. Pitched roof rainwater drains normally consist of gutters which accumulate rainwater which travels by means of gravity down to the roof edge. Gutters channel this water towards downspouts which route the water flow down and far away from the structure or in to sewers. Flat roof drains are one of three main types: scuppers, inner drains or siphonic drains.

Roof Rainwater Drain Scuppes


Scuppers are located on a roof's periphery. Scuppers can also be installed on a balcony or terrace. Small holes are cut into the side of the roof structure so that rain water can empty and drain the roof top. Scuppers can attach to a downspout, or can be lengthened to make sure that water is directed off of the building sides and foundation.

Inner Roof Drains


There are many types of inner drains for flat roofs. These are positioned at low spots in the roof and attach to interior drainage pipes that drive water outside or in to a sewer system. Several styles of internal roof drains have domes, strainers or covers which prevent trash from obstructing the roof drain pipe. These types of drains work via gravity channeling pooling water thru the roof drain system. They can be constructed from PVC, cast iron or cast aluminum.

Siphonic Roof Drains

Siphonic roof drains are a more efficient substitute for gravity drainage. Conventional 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 adding an engineered baffle to the sump of the drain body it creates a siphonic drain which removes air from the system and allows for smaller pipe diameters . When all air is removed, a negative air pressure in the tail portion of the drain is set up which draws water off the roof siphonically. Although used primarily for flat roofs, siphonic drains can also be set up on angled roofs.

If you need more information about flat roof drain or cast iron roof drain in and around Saraland, Alabama, give us a call. We'd be glad to help.