Roof Drains


At this time there are a number of different kinds of roof water drains and roof drain scupper in Anniston, AL and each is a specific approach to the wide range of roof types and their drainage challenges. You need to think about the kind of roof, its size, and the roof pitch to be able to pick the most suitable drain. You also should take into account the site of the drain, how much rainwater is anticipated and safety when choosing a roof water drain for a home or business structure.

Hip roofs, dormers, gable and mansard roofs shed rainwater water due to gravitational force. Flat roofs, alternatively, accumulate water. Unless this water is directed out and away from the flat roof structure, it will most likely develop pools that may inevitably leak and the accumulated weight may eventually cause compromising the integrity of the structure. That is the reason that roofs with a pitch of below two percent should have roof drains positioned at the lowest places on the roof in which water puddles and need to be uniformly spaced all throughout the roof surface.

Roof Drain Types


There are a number of distinct variations of roof drains. They basically fall into two categories: flat roof drains and pitched roof drains. Pitched roof rainwater drains normally consist of gutters which collect rainwater that passes via gravity down to the roof periphery. Gutters channel this water in the direction of downspouts which direct the water flow down and far away from the building or in to sewer lines. Flat roof drains can be one of three primary 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 water can empty and drain the roof top. Scuppers can connect to a downspout, or could be extended so that water is directed away from the structure sides and foundation.

Interior Roof Drains


There are quite a few different types of inner drains for flat roofs. These are positioned at low places in the roof and connect to interior drainage pipes that direct water outside or in to a sewer system. Many designs of inner roof drains have domes, strainers or covers which keep debris from obstructing the roof drain pipe. These types of drains operate via gravity funneling pooling water thru 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. Standard flat roof drainage permits both air and water to go into the drain system creating pipe space occupied by both air and water. By incorporating an engineered baffle to the sump of the drain body it creates a siphonic drain that removes air from the system and allows for smaller pipe diameters . When all air is removed, a negative air pressure in the tail piece of the drain is established which attracts water 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 scupper in and around Anniston, Alabama, give us a call. We'd be glad to help.