Roof Drains


At this time there are a number of different kinds of roof water drains and cast iron roof drain in Phenix City, AL and each one is a specific solution to the wide range of roof styles and their drainage issues. You should think about the type of roof, its size, and its roof pitch to be able to select the correct drain. You also should take into account the location of the drain, how much rainwater is expected and safe practices when selecting a roof water drain for a house or commercial structure.

Hip roofs, dormers, gable and mansard roofs shed water because of gravitational force. Flat roofs, on the other hand, accumulate water. Until the water is directed out and away from the roof , it will develop pools that could eventually leak and the amassed weight will subsequently cause compromising the integrity of the structure. That is the reason that roofs with a pitch of below 2% should have roof drains situated at the lowest spots on the roof where water puddles and should be uniformly spread all throughout the roof surface.

Types of Roof Drains


There are several different alternatives of roof drains. They generally fall into two categories: flat roof drains and pitched roof drains. Pitched roof drains usually consist of gutters which collect rainwater that travels by means of gravity to the roof periphery. Gutters channel this water towards downspouts which steer the water flow down and far away from the building or into sewers. Flat roof drains can be 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 placed on a balcony or terrace. Small openings are cut in the side of the roof structure so that rain water can flow out and drain the roof surface. Scuppers can attach to a downspout, or can be lengthened to make sure that water is guided off of the structure sides and foundation.

Inner Roof Drains


There are many types of inner drains for flat roofs. They are positioned at low areas on the roof and connect to inner drainage pipes that drive water outdoors or in to a sewer system. Several models of internal roof drains have domes, strainers or covers which keep trash from obstructing the roof drain pipe. These types of drains operate via gravitational force funneling standing water through the roof drain system. They can be made of 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 creating pipe space occupied by both air and water. By adding an engineered baffle to the sump of the drain system it produces a siphonic drain that removes air from the system and allows for smaller sized pipe diameters . When all air is eliminated, a negative air pressure in the tail piece of the drain is set up which attracts water off the roof siphonically. Although used primarily for flat roofs, siphonic drains can also be installed on pitched roofs.

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