Roof Drains


At this time there are a number of distinct types of roof drains and roof drain downspout in Oneonta, AL and each one is a specific answer to the wide range of roof styles and their drainage challenges. You need to consider the kind of roof, its size, and the roof pitch to be able to choose the most suitable drain. You also may want to take into account the location of the drain, how much rainwater is anticipated and safe practices when choosing a roof water drain for a residence or commercial building.

Hip roofs, dormers, gable and mansard roofs shed rainwater water because of gravitational force. Flat roofs, alternatively, accumulate water. Unless the water is routed out and away from the roof , it will most likely develop pools that may eventually leak and the accumulated weight may eventually cause structural damage. That is the reason that roofs with a pitch of under 2% should have roof drains positioned in the lowest areas on the roof where water puddles and should 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 2 groups: pitched roof drains and flat roof drains. Pitched roof drains usually consist of gutters which collect rainwater which travels via gravity to the roof periphery. Gutters transport this water towards downspouts which direct the water flow down and away from the building or in to sewer lines. Flat roof drains are 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 openings are cut into the side of the roof structure so rain water can flow out and drain the roof top. Scuppers can hook up to a downspout, or can be extended so that water is directed off of the structure sides and foundation.

Inner Roof Drains


There are many types of inner drains for flat roofs. They are installed at low areas in the roof and connect to inner drainage pipes that drive water outdoors or into a sewer system. Many styles of internal roof drains have domes, strainers or covers which prevent debris from clogging the roof drain pipe. These kinds of drains work via gravity funneling pooling water through the roof drain system. They can be constructed from PVC, cast iron or cast aluminum.

Siphonic Roof Drains

Siphonic roof drains are a more effective substitute for gravity drainage. Traditional 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 body it produces a siphonic drain which eliminates air from the system and permits smaller pipe diameters . When all air is removed, a negative air pressure in the tail portion 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 angled roofs.

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