Roof Drains


There are several different varieties of roof water drains and roof drain system in Oxford, AL and each one is an unique approach to the wide range of roof types and their drainage challenges. You need to look at the kind of roof, its size, and its roof pitch to be able to pick the correct drain. You also should take into consideration the site of the drain, how much rainwater is anticipated and safe practices when selecting a roof water drain for a home or business structure.

Gambrel, dormers, hip and gable roofs shed water due to gravity. Flat roofs, on the other hand, accumulate water. Until this water is guided out and away from the flat roof structure, it will develop pools of water that may eventually leak and the amassed weight will eventually cause structural damage. That is the reason that roofs with a pitch of under 2% should have roof drains positioned in the lowest places on the roof in which water pools and should be evenly spread throughout the roof top.

Roof Drain Types


There are several distinct variations of roof drains. They basically fall into 2 categories: flat roof drains and pitched roof drains. Pitched roof drains normally comprise gutters which accumulate rainwater that passes by means of gravity to the roof edge. Gutters direct this water in the direction of downspouts which direct the water flow down and 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 Rainwater Drain Scuppes


Scuppers are situated on a roof's periphery. Scuppers can also be installed on a balcony or terrace. Small holes are cut in the side of the roof structure so that water can empty and drain the roof top. Scuppers can hook up to a downspout, or can be extended so that water is guided away from the building sides and foundation.

Interior Roof Drains


There are many kinds of inner drains for flat roofs. They are installed at low spots on the roof and connect to interior drainage pipes that direct water outdoors or in to a sewer system. Many designs of inner roof drains have domes, strainers or covers that prevent debris from obstructing the roof drain pipe. These kinds of drains operate via gravity funneling pooling 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 efficient alternative to gravity drainage. Standard flat roof drainage permits both air and water to enter the drain system creating pipe space which is occupied by both air and water. By incorporating an engineered baffle to the sump of the drain body it creates a siphonic drain which eliminates air from the system and allows for smaller sized pipe diameters to be used. When all of the air is eliminated, a negative air pressure in the tail piece of the drain is set up which pulls rainwater off the roof siphonically. Though 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 system in and around Oxford, Alabama, give us a call. We'd be glad to help.