Roof Drains


There are a few distinct varieties of roof drains and roof drain cover in Birmingham, AL and each one is a specific approach to the variety of roof styles and their drainage challenges. You must look at the kind of roof, its size, and its roof pitch to be able to choose the right drain. You also may want to take into consideration the location of the drain, how much rainwater is anticipated and safety when selecting a roof water drain for a residence or business structure.

Gable, dormer, mansard and hip roofs shed water thanks to gravitational force. Flat roofs, alternatively, collect rain water. Until this water is routed out and away from the flat roof structure, it will develop pools of water that may inevitably leak and the accumulated weight will eventually result in compromising the integrity of the structure. That is why roofs with a slope of below two percent ought to have roof drains located in the lowest places on the roof where water puddles and need to be uniformly spaced throughout the roof surface.

Types of Roof Drains


There are a number of distinct alternatives of roof drains. They generally fall into two groups: flat roof drains and pitched roof drains. Pitched roof drains normally consist of gutters which accumulate rainwater that passes via gravity down to the roof edge. Gutters channel this water towards downspouts which direct the water flow down and far away from the building or in to sewer lines. Flat roof drains can be one of three main types: scuppers, inner drains or siphonic drains.

Roof Rainwater Drain Scuppes


Scuppers are located on the roof's periphery. Scuppers can also be put in on a balcony or terrace. Small openings are cut in the side of the roof structure so water can flow out and drain the roof surface. Scuppers can connect to a downspout, or could be lengthened so that water is directed away from the building sides and foundation.

Interior Roof Drains


There are many types of inner drains for flat roofs. These are installed at low spots in the roof and connect to interior drainage pipes that direct water outside or into 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 operate via gravitational force channeling standing water thru 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 substitute for gravity drainage. Standard flat roof drainage allows 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 body it produces a siphonic drain that eliminates air from the system and permits smaller pipe diameters . When all air is eliminated, a negative air pressure in the tail piece of the drain is set up which draws water 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 cover in and around Birmingham, Alabama, give us a call. We'd be glad to help.