Roof Drains


At this time there are several different kinds of roof water drains and roof drain pipe in Oxford, AL and each is a specific solution to the variety of roof types and their drainage challenges. You must think about the type of roof, its size, and the roof pitch to be able to pick the correct drain. You also should take into account the site of the drain, how much rainwater is anticipated and safe practices when choosing a roof drain for a house or business structure.

Gambrel, dormers, hip and gable roofs shed rainwater water thanks to gravity. Flat roofs, alternatively, accumulate rain water. Until this water is routed out and away from the flat roof , it will most likely develop pools of water that could inevitably leak and the amassed weight will eventually cause structural damage. That is the reason that roofs with a slope of under two percent should have roof drains situated at the lowest spots on the roof where water puddles and should be evenly spaced all throughout the roof surface.

Roof Drain Types


There are a number of different variations of roof drains. They generally fall into two groups: pitched roof drains and flat roof drains. Pitched roof rainwater drains usually comprise gutters that collect rainwater which travels 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 building or into sewer lines. Flat roof drains are one of three primary types: scuppers, inner drains or siphonic drains.

Roof Drain Scuppers


Scuppers are situated on the roof's perimeter. Scuppers 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 surface. Scuppers can hook up to a downspout, or can be extended so that water is directed away from the building sides and foundation.

Interior Roof Drains


There are many kinds of inner drains for flat roofs. These are positioned at low places in the roof and connect to interior drainage pipes that drive water outside or into a sewer system. Many designs of inner roof drains have domes, strainers or covers that 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. Standard flat roof drainage allows both air and water to enter 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 removes air from the system and allows for 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 water off the roof siphonically. Although used mainly for flat roofs, siphonic drains can also be installed on pitched roofs.

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