Roof Drains


There are several distinct types of roof drains and roof drain downspout in Dothan, AL and each one is a specific approach to the variety of roof styles and their drainage concerns. You should look at the type of roof, its dimensions, and the roof pitch to be able to choose the correct drain. You also should take into consideration the location of the drain, how much rainwater is anticipated and safety when selecting a roof drain for a home or commercial building.

Gable, dormer, mansard and hip roofs shed rainwater water thanks to gravitational force. Flat roofs, conversely, collect rain water. Until this water is directed out and away from the flat roof , it will most likely develop pools that could eventually leak and the accumulated weight may subsequently result in structural damage. That is the reason that roofs with a slope of less than two percent should have roof drains located in the lowest places on the roof where water pools and should be evenly spaced throughout the roof surface.

Roof Drain Types


There are several distinct variations of roof drains. They basically fall into two categories: flat roof drains and pitched roof drains. Pitched roof drains normally comprise gutters which collect rainwater which travels by means of gravity to the roof edge. Gutters direct this water in the direction of downspouts which route the water flow down and away from the structure or into sewers. Flat roof drains can be one of three main types: scuppers, inner drains or siphonic drains.

Roof Drain Scuppers


Scuppers are located on the roof's perimeter. They can also be put in 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 could be lengthened to make sure that water is guided off of the building sides and foundation.

Inner Roof Drains


There are quite a few different types of inner drains for flat roofs. These are installed at low areas on the roof and connect to interior drainage pipes that route water outdoors or in to a sewer system. Many designs of inner roof drains have domes, strainers or covers which prevent debris from obstructing the roof drain pipe. These types of drains work via gravitational force 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. Standard flat roof drainage permits both air and water to go into the drain system creating pipe space which is occupied by both air and water. By adding an engineered baffle to the sump of the drain system it creates a siphonic drain which removes air from the system and permits smaller pipe diameters to be used. When all air is eliminated, a negative air pressure in the tail piece of the drain is set up which draws water off the roof siphonically. Although used mainly for flat roofs, siphonic drains can also be set up on pitched roofs.

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