Roof Drains


There are a few different varieties of roof water drains and roof drain system in Phenix City, AL and each one is a specific answer to the variety of roof styles and their drainage concerns. You need to take into consideration the type of roof, its size, and the roof pitch to be able to select the right drain. You also should take into consideration the site of the drain, what amount of rainwater is expected and safe practices when selecting a roof drain for a home or business building.

Hip roofs, dormers, gable and mansard roofs shed water due to gravitational force. Flat roofs, conversely, collect rain water. Unless the water is directed out and away from the roof , it will create pools of water that may eventually leak and the amassed weight may subsequently result in damage to the structure. That is why roofs with a slope of below two percent should have roof drains positioned in the lowest places on the roof where water puddles and should be evenly spread throughout the roof surface.

Kinds of Roof Drains


There are a number of distinct alternatives of roof drains. They basically fall into 2 groups: flat roof drains and pitched roof drains. Pitched roof rainwater drains normally consist of gutters which collect rainwater which passes by means of gravity down to the roof edge. Gutters direct this water in the direction of downspouts which steer the water flow down and away from the building or into sewers. Flat roof drains can be one of three primary types: scuppers, inner drains or siphonic drains.

Roof Rainwater Drain Scuppes


Scuppers are located on the 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 water can flow out and drain the roof top. Scuppers can attach to a downspout, or could be lengthened to make sure that water is guided off of the structure sides and foundation.

Inner Roof Drains


There are quite a few different types of inner drains for flat roofs. They are installed at low spots in the roof and attach to inner drainage pipes that route water outside or into a sewer system. Many versions of inner roof drains have domes, strainers or covers which keep trash from blocking the roof drain pipe. These kinds of drains work via gravity channeling pooling water through the roof drain system. They are 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 allows both air and water to enter the drain system producing pipe space occupied by both air and water. By incorporating an engineered baffle to the sump of the drain body it creates a siphonic drain that 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 set up which attracts water off the roof siphonically. Although used mainly for flat roofs, siphonic drains can also be installed on angled roofs.

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