Roof Drains


There are several distinct varieties of roof drains and roof drain system in Auburn, AL and each is an unique approach to the wide range of roof styles and their drainage concerns. You must take into consideration the type of roof, its size, and its roof pitch to be able to select the most suitable 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 residence or business structure.

Gambrel, dormers, hip and gable roofs shed rainwater water because of gravity. Flat roofs, on the other hand, collect water. Unless the water is directed out and away from the flat roof structure, it will create pools that could inevitably leak and the amassed weight may subsequently cause compromising the integrity of the structure. That is why roofs with a pitch of less than 2% should have roof drains located at the lowest places on the roof in which water pools and need to be uniformly spread throughout the roof top.

Kinds of Roof Drains


There are several different alternatives of roof drains. They basically fall into 2 categories: flat roof drains and pitched roof drains. Pitched roof drains normally comprise gutters that accumulate rainwater which travels by means of gravity down to the roof periphery. Gutters channel this water towards downspouts which route the water flow down and far away from the building or into sewer lines. Flat roof drains can be one of three primary types: scuppers, inner drains or siphonic drains.

Roof Drain Scuppers


Scuppers are situated on a roof's perimeter. Scuppers can also be placed on a balcony or terrace. Small holes are cut into the side of the roof structure so water can empty and drain the roof surface. Scuppers can attach to a downspout, or can be lengthened so that water is directed away from the structure sides and foundation.

Inner 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 attach to interior drainage pipes that route water outdoors or into a sewer system. Several styles of inner roof drains have domes, strainers or covers that keep trash from clogging the roof drain pipe. These kinds of drains work via gravity channeling standing 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 alternative to gravity drainage. Standard flat roof drainage permits both air and water to enter the drain system creating 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 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 draws 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 system in and around Auburn, Alabama, give us a call. We'd be glad to help.