Roof Drains


At this time there are a few distinct varieties of roof drains and roof drain downspout in Birmingham, AL and each one is an unique solution to the wide range of roof types and their drainage issues. You need to take into consideration the type of roof, its dimensions, and the roof pitch to be able to select the most suitable drain. You also need to think about the site of the drain, what amount of rainwater is anticipated and safe practices when choosing a roof drain for a home or business structure.

Gambrel, dormers, hip and gable roofs shed water because of 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 inevitably leak and the accumulated weight may eventually cause structural damage. That is why roofs with a slope of under 2% ought to have roof drains positioned in the lowest areas on the roof in which water pools and should be evenly spaced throughout the roof top.

Roof Drain Types


There are several distinct variations of roof drains. They generally fall into 2 categories: flat roof drains and pitched roof drains. Pitched roof drains usually consist of gutters that accumulate rainwater that travels by means of gravity down to the roof edge. Gutters transport this water towards downspouts which direct the water flow down and far away from the structure 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 a roof's periphery. They can also be placed on a balcony or terrace. Small holes are cut into the side of the roof structure so that rain water can empty and drain the roof top. Scuppers can hook up to a downspout, or could be extended so that water is guided off of the building sides and foundation.

Interior Roof Drains


There are many types of inner drains for flat roofs. These are positioned at low areas in the roof and connect to inner drainage pipes that direct water outdoors or into a sewer system. Many designs of internal roof drains have domes, strainers or covers that keep debris from blocking the roof drain pipe. These types of drains work via gravitational force channeling 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 alternative to gravity drainage. Conventional flat roof drainage allows both air and water to enter the drain system producing pipe space occupied by both air and water. By adding an engineered baffle to the sump of the drain body it produces a siphonic drain that removes air from the system and permits smaller pipe diameters . When all 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 pitched roofs.

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