Roof Drains


There are a number of distinct types of roof drains and roof drain downspout in Leeds, AL and each one is an unique solution to the variety of roof types and their drainage challenges. You should consider the kind of roof, its dimensions, and its roof pitch to be able to pick the most suitable drain. You also need to take into account the location of the drain, how much rainwater is expected and safety when choosing a roof water drain for a residence or business building.

Gambrel, dormers, hip and gable roofs shed water thanks to gravitational force. Flat roofs, on the other hand, accumulate rain water. Until this water is guided out and away from the flat roof structure, it will most likely develop pools that could inevitably leak and the amassed weight may subsequently result in compromising the integrity of the structure. That is why roofs with a slope of less than two percent should have roof drains positioned in the lowest spots on the roof where water pools and need to be uniformly spaced all throughout the roof top.

Roof Drain Types


There are several distinct variations of roof drains. They generally fall into 2 categories: pitched roof drains and flat roof drains. Pitched roof rainwater drains usually consist of gutters that accumulate rainwater that passes by means of gravity down to the roof edge. Gutters channel this water towards downspouts which direct the water flow down and away from the building or in to sewers. Flat roof drains can be one of three main types: scuppers, inner drains or siphonic drains.

Roof Drain Scuppers


Scuppers are situated on a roof's perimeter. Scuppers can also be put in on a balcony or terrace. Small openings are cut in the side of the roof structure so water can empty and drain the roof surface. Scuppers can connect to a downspout, or could be extended so that water is guided away from the structure sides and foundation.

Interior Roof Drains


There are quite a few different kinds of inner drains for flat roofs. These are positioned at low places in the roof and connect to inner drainage pipes that route water outside or in to a sewer system. Many designs of internal roof drains have domes, strainers or covers which prevent trash from obstructing the roof drain pipe. These types of drains operate via gravity 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 alternative to gravity drainage. Standard flat roof drainage permits both air and water to enter the drain system producing pipe space which is occupied by both air and water. By incorporating an engineered baffle to the sump of the drain system it creates a siphonic drain which removes air from the system and allows for smaller pipe diameters . When all air is removed, a negative air pressure in the tail portion of the drain is set up which pulls water off the roof siphonically. Although used primarily 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 Leeds, Alabama, give us a call. We'd be glad to help.