Roof Drains


At this time there are a number of different varieties of roof drains and roof drain scupper in Huntsville, AL and each is an unique solution to the wide range of roof types and their drainage concerns. You need to think about the kind of roof, its dimensions, and its roof pitch to be able to pick the right drain. You also should think about the site of the drain, how much rainwater is expected and safety when selecting a roof water drain for a residence or business building.

Gambrel, dormers, hip and gable roofs shed rainwater water due to gravitational force. Flat roofs, alternatively, collect water. Until this water is guided out and away from the flat roof structure, it will most likely create pools that could eventually leak and the accumulated weight will subsequently result in structural damage. That is why roofs with a slope of under two percent ought to have roof drains positioned at the lowest areas on the roof in which water pools and need to be uniformly spaced all throughout the roof top.

Kinds of Roof Drains


There are a number of different alternatives of roof drains. They basically fall into two groups: flat roof drains and pitched roof drains. Pitched roof rainwater drains usually consist of gutters that collect rainwater that travels via gravity down to the roof periphery. Gutters direct this water towards downspouts which steer the water flow down and away from the structure or in to sewer lines. Flat roof drains are one of three primary types: scuppers, inner drains or siphonic drains.

Roof Rainwater Drain Scuppes


Scuppers are located on a roof's periphery. They can also be installed on a balcony or terrace. Small openings are cut into the side of the roof structure so that water can flow out and drain the roof top. Scuppers can attach to a downspout, or could be extended to make sure that water is directed off of the structure sides and foundation.

Interior Roof Drains


There are many types of inner drains for flat roofs. These are positioned at low places in the roof and attach to interior drainage pipes that direct water outside or in to a sewer system. Many models of internal roof drains have domes, strainers or covers which keep trash from blocking the roof drain pipe. These kinds of drains work via gravitational force funneling pooling 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 alternative to gravity drainage. Standard flat roof drainage allows 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 eliminates air from the system and allows for smaller sized pipe diameters . When all air is removed, a negative air pressure in the tail piece of the drain is set up which attracts rainwater off the roof siphonically. Although 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 roof drain scupper in and around Huntsville, Alabama, give us a call. We'd be glad to help.