Roof Drains


At this time there are a number of distinct varieties of roof water drains and cast iron roof drain in Fairfield, AL and each is an unique approach to the wide range of roof styles and their drainage issues. You need to take into consideration the kind of roof, its size, and its roof pitch to be able to choose the most suitable drain. You also should take into consideration the location of the drain, how much rainwater is anticipated and safe practices when choosing a roof water drain for a residence or business structure.

Hip roofs, dormers, gable and mansard roofs shed rainwater water due to gravitational force. Flat roofs, on the other hand, accumulate rain water. Until this water is guided out and away from the roof , it will most likely develop pools of water that may inevitably leak and the amassed weight will eventually result in damage to the structure. That is the reason that roofs with a slope of under two percent should have roof drains positioned in the lowest areas on the roof where water pools and need to be uniformly spread throughout the roof surface.

Roof Drain Types


There are a number of different alternatives of roof drains. They basically fall into two groups: pitched roof drains and flat roof drains. Pitched roof drains usually comprise gutters that accumulate rainwater which 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 into sewers. Flat roof drains are one of three main types: scuppers, inner drains or siphonic drains.

Roof Drain Scuppers


Scuppers are situated on the roof's perimeter. They can also be installed on a balcony or terrace. Small openings are cut in the side of the roof structure so rain water can empty and drain the roof top. Scuppers can hook up to a downspout, or can be extended so that water is guided away from the building sides and foundation.

Inner Roof Drains


There are many kinds of inner drains for flat roofs. These are installed at low areas in the roof and connect to interior drainage pipes that drive water outside or into a sewer system. Many styles of internal roof drains have domes, strainers or covers which keep debris from obstructing the roof drain pipe. These kinds of drains work via gravitational force channeling standing water thru the roof drain system. They are made of PVC, cast iron or cast aluminum.

Siphonic Roof Drains

Siphonic roof drains are a more effective substitute for gravity drainage. Conventional flat roof drainage permits both air and water to go into the drain system producing pipe space occupied by both air and water. By adding an engineered baffle to the sump of the drain system it creates a siphonic drain which eliminates 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 water off the roof siphonically. Though 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 Fairfield, Alabama, give us a call. We'd be glad to help.