Roof Drains


At this time there are a few distinct varieties of roof drains and roof drain scupper in Jacksonville, AL and each one is an unique solution to the variety of roof styles and their drainage issues. You must look at the kind of roof, its size, and its roof pitch to be able to select the right drain. You also should take into account the site of the drain, what amount of rainwater is expected and safety when selecting a roof drain for a home or business building.

Hip roofs, dormers, gable and mansard roofs shed water thanks to gravity. Flat roofs, alternatively, accumulate rain water. Until the water is routed out and away from the roof structure, it will develop pools of water that could inevitably leak and the accumulated weight may subsequently result in structural damage. That is why roofs with a slope of below 2% should have roof drains situated in the lowest places on the roof where water puddles and need to be evenly spread all throughout the roof surface.

Roof Drain Types


There are a number of distinct variations of roof drains. They generally fall into two groups: flat roof drains and pitched roof drains. Pitched roof drains usually consist of gutters which accumulate rainwater that passes via gravity to the roof periphery. Gutters direct this water in the direction of downspouts which steer the water flow down and far away from the structure or into sewer lines. Flat roof drains can be one of three main types: scuppers, inner drains or siphonic drains.

Roof Drain Scuppers


Scuppers are located on the roof's perimeter. They can also be put in on a balcony or terrace. Small holes are cut in the side of the roof structure so that water can flow out and drain the roof top. Scuppers can connect to a downspout, or can be lengthened so that water is guided off of the structure sides and foundation.

Inner Roof Drains


There are many types of inner drains for flat roofs. They are positioned at low areas on the roof and attach to inner drainage pipes that direct water outdoors or in to a sewer system. Many styles of inner roof drains have domes, strainers or covers that keep trash from clogging the roof drain pipe. These types of drains operate via gravity channeling standing water thru the roof drain system. They can be made from PVC, cast iron or cast aluminum.

Siphonic Roof Drains

Siphonic roof drains are a more effective alternative to gravity drainage. Traditional flat roof drainage permits both air and water to enter the drain system producing 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 eliminates air from the system and permits smaller pipe diameters to be used. When all of the air is eliminated, a negative air pressure in the tail portion of the drain is established which pulls rainwater off the roof siphonically. Though used mainly for flat roofs, siphonic drains can also be set up on angled roofs.

If you need more information about flat roof drain or roof drain scupper in and around Jacksonville, Alabama, give us a call. We'd be glad to help.