Roof Drains


At this time there are a few distinct types of roof drains and roof drain cover in Phenix City, AL and each is a specific solution to the variety of roof types and their drainage issues. You should think about 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 expected and safe practices when choosing a roof water drain for a house or commercial structure.

Hip roofs, dormers, gable and mansard roofs shed water because of gravity. Flat roofs, conversely, accumulate rain water. Unless the water is guided out and away from the roof structure, it will create pools that could inevitably leak and the amassed weight will eventually result in structural damage. That is why roofs with a slope of below two percent ought to have roof drains positioned in the lowest places on the roof where water pools and need to be evenly spread throughout the roof top.

Kinds of Roof Drains


There are a number of different variations of roof drains. They basically fall into 2 groups: pitched roof drains and flat roof drains. Pitched roof rainwater drains normally comprise gutters which accumulate rainwater which passes by means of gravity to the roof periphery. Gutters direct this water in the direction of downspouts which direct the water flow down and far away from the building or into 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 put in on a balcony or terrace. Small holes are cut in the side of the roof structure so that water can empty and drain the roof surface. Scuppers can hook up to a downspout, or can be extended to make sure that water is guided off of the structure sides and foundation.

Inner Roof Drains


There are many kinds of inner drains for flat roofs. These are installed at low spots on the roof and connect to inner drainage pipes that route water outdoors or into a sewer system. Several designs of inner roof drains have domes, strainers or covers that prevent trash from obstructing the roof drain pipe. These types of drains work via gravitational force funneling pooling water thru 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 substitute for gravity drainage. Traditional flat roof drainage permits both air and water to go into 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 creates a siphonic drain that eliminates air from the system and permits smaller sized pipe diameters . When all air is eliminated, a negative air pressure in the tail portion of the drain is set up which pulls rainwater off the roof siphonically. Although used primarily for flat roofs, siphonic drains can also be installed on angled roofs.

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