Roof Drains


At this time there are several distinct varieties of roof water drains and roof drain scupper in Florence, AL and each is an unique answer to the variety of roof types and their drainage issues. You must look at the kind of roof, its dimensions, and the roof pitch to be able to choose the correct drain. You also need to think about the site of the drain, what amount of rainwater is expected and safety when selecting a roof water drain for a residence or business structure.

Gambrel, dormers, hip and gable roofs shed rainwater water thanks to gravitational force. Flat roofs, conversely, collect water. Unless this water is directed out and away from the roof structure, it will develop pools that may inevitably leak and the accumulated weight will eventually cause compromising the integrity of the structure. That is the reason that roofs with a slope of under two percent should have roof drains positioned at the lowest places on the roof in which water puddles and should be uniformly spaced throughout the roof surface.

Kinds of Roof Drains


There are several different variations of roof drains. They generally fall into two groups: pitched roof drains and flat roof drains. Pitched roof rainwater drains usually consist of gutters that collect rainwater which travels via gravity to the roof edge. Gutters transport this water in the direction of downspouts which steer the water flow down and away from the building or in to sewer lines. Flat roof drains are one of three primary types: scuppers, inner drains or siphonic drains.

Roof Drain Scuppers


Scuppers are situated on a roof's periphery. 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 flow out and drain the roof surface. Scuppers can connect to a downspout, or can be extended to make sure that water is directed off of the structure sides and foundation.

Interior Roof Drains


There are quite a few different kinds of inner drains for flat roofs. They are positioned at low places in the roof and connect to interior drainage pipes that route water outside or into a sewer system. Many versions of internal roof drains have domes, strainers or covers that keep debris from blocking the roof drain pipe. These kinds of drains operate via gravitational force channeling pooling water thru the roof drain system. They are made from PVC, cast iron or cast aluminum.

Siphonic Roof Drains

Siphonic roof drains are a more effective alternative to gravity drainage. Standard flat roof drainage permits 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 system it creates a siphonic drain which removes air from the system and allows for smaller pipe diameters to be used. When all air is removed, a negative air pressure in the tail piece of the drain is established which pulls rainwater 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 Florence, Alabama, give us a call. We'd be glad to help.