Roof Drains


At this time there are several distinct varieties of roof water drains and cast iron roof drain in Moulton, AL and each is a specific approach to the variety of roof styles and their drainage issues. You must consider the kind of roof, its size, and its roof pitch to be able to choose the most suitable drain. You also should think about the location of the drain, how much rainwater is expected and safe practices when selecting a roof water drain for a residence or commercial structure.

Gambrel, dormers, hip and gable roofs shed water due to gravity. Flat roofs, on the other hand, collect water. Until this water is routed out and away from the flat roof , it will most likely develop pools of water that could inevitably leak and the amassed weight will eventually result in damage to the structure. That is why roofs with a slope of less than 2% should have roof drains situated in the lowest places on the roof in which water pools and need to be uniformly spaced throughout the roof surface.

Types of Roof Drains


There are several distinct variations of roof drains. They generally fall into 2 categories: flat roof drains and pitched roof drains. Pitched roof rainwater drains usually consist of gutters that accumulate rainwater that travels by means of gravity to the roof periphery. Gutters direct this water towards downspouts which steer the water flow down and far away from the building or in to sewer lines. Flat roof drains are 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 put in on a balcony or terrace. Small holes are cut in the side of the roof structure so that rain water can empty and drain the roof surface. Scuppers can attach to a downspout, or can be extended to make sure that water is guided away from the building sides and foundation.

Inner Roof Drains


There are quite a few different kinds of inner drains for flat roofs. They are installed at low areas on the roof and attach to interior drainage pipes that direct water outside or into a sewer system. Several styles of inner roof drains have domes, strainers or covers that prevent debris from obstructing the roof drain pipe. These types of drains work via gravity channeling pooling water through 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 alternative to gravity drainage. Conventional flat roof drainage allows 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 body it produces a siphonic drain that eliminates 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 piece of the drain is set up which pulls water off the roof siphonically. Though 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 cast iron roof drain in and around Moulton, Alabama, give us a call. We'd be glad to help.