Roof Drains


At this time there are a few different varieties of roof drains and roof drain system in Birmingham, AL and each is a specific approach to the wide range of roof styles and their drainage challenges. You should think about the kind of roof, its dimensions, and the roof pitch to be able to choose the most suitable drain. You also should take into account the location of the drain, how much rainwater is anticipated and safety when choosing a roof water drain for a house or commercial structure.

Gambrel, dormers, hip and gable roofs shed rainwater water due to gravity. Flat roofs, conversely, collect rain water. Until the water is guided out and away from the flat roof structure, it will create pools of water that could eventually leak and the accumulated weight will subsequently cause damage to the structure. That is the reason that roofs with a slope of less than 2% ought to have roof drains located at the lowest places on the roof in which water puddles and should be evenly spread throughout the roof top.

Types of Roof Drains


There are several distinct variations of roof drains. They basically fall into two groups: pitched roof drains and flat roof drains. Pitched roof rainwater drains normally consist of gutters which collect rainwater that travels by means of gravity to the roof periphery. Gutters direct this water towards downspouts which direct the water flow down and far away from the building or into sewer lines. Flat roof drains are one of three main types: scuppers, inner drains or siphonic drains.

Roof Drain Scuppers


Scuppers are situated on a roof's perimeter. Scuppers can also be installed on a balcony or terrace. Small holes are cut into the side of the roof structure so that rain water can flow out and drain the roof top. Scuppers can connect to a downspout, or can be lengthened so that water is guided away from the structure sides and foundation.

Inner Roof Drains


There are quite a few different kinds of inner drains for flat roofs. These are installed at low places in the roof and connect to interior drainage pipes that route water outdoors or in to a sewer system. Several models of internal roof drains have domes, strainers or covers that prevent debris from blocking the roof drain pipe. These types of drains work via gravitational force channeling pooling water through the roof drain system. They can be made of PVC, cast iron or cast aluminum.

Siphonic Roof Drains

Siphonic roof drains are a more effective alternative to gravity drainage. Conventional flat roof drainage permits both air and water to enter the drain system producing pipe space which is occupied by both air and water. By incorporating an engineered baffle to the sump of the drain system it produces a siphonic drain which removes air from the system and allows for smaller pipe diameters . When all of the air is eliminated, a negative air pressure in the tail portion of the drain is set up which attracts water off the roof siphonically. Though used primarily 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 Birmingham, Alabama, give us a call. We'd be glad to help.