Roof Drains


At this time there are several distinct kinds of roof drains and roof drain pipe in Bessemer, AL and each is an unique answer to the wide range of roof styles and their drainage challenges. You must consider the kind of roof, its dimensions, and its roof pitch to be able to choose the right drain. You also need to take into account the site of the drain, what amount of rainwater is anticipated and safety when choosing a roof water drain for a home or business building.

Gambrel, dormers, hip and gable roofs shed rainwater water thanks to gravitational force. Flat roofs, on the other hand, accumulate rain water. Until the water is directed out and away from the roof , it will develop pools that may eventually leak and the amassed weight will eventually result in structural damage. That is why roofs with a pitch of under 2% ought to have roof drains located at the lowest places on the roof in which water pools and need to be uniformly spaced throughout the roof top.

Kinds of Roof Drains


There are a number of different alternatives of roof drains. They basically fall into 2 groups: flat roof drains and pitched roof drains. Pitched roof drains usually consist of gutters which accumulate rainwater that travels via gravity down 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 can be one of three primary types: scuppers, inner drains or siphonic drains.

Roof Drain Scuppers


Scuppers are situated on a roof's periphery. Scuppers can also be placed on a balcony or terrace. Small holes 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 to make sure that water is directed away from the structure sides and foundation.

Inner Roof Drains


There are quite a few different types of inner drains for flat roofs. These are positioned at low spots on the roof and attach to inner drainage pipes that drive water outdoors or into a sewer system. Several styles of inner roof drains have domes, strainers or covers that prevent debris from blocking the roof drain pipe. These kinds of drains operate via gravitational force funneling standing water through the roof drain system. They are constructed from PVC, cast iron or cast aluminum.

Siphonic Roof Drains

Siphonic roof drains are a more efficient substitute for gravity drainage. Conventional flat roof drainage allows both air and water to go into the drain system producing pipe space which is occupied by both air and water. By adding an engineered baffle to the sump of the drain system it produces a siphonic drain which eliminates 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 set up which draws rainwater off the roof siphonically. Though used mainly for flat roofs, siphonic drains can also be installed on angled roofs.

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