Roof Drains


There are a few different types of roof drains and roof drain dome in Saraland, AL and each is an unique solution to the variety of roof styles and their drainage concerns. You should take into consideration the type of roof, its size, and its roof pitch to be able to choose the most suitable drain. You also may want to take into account the site of the drain, how much rainwater is anticipated and safe practices when selecting a roof water drain for a residence or business building.

Gambrel, dormers, hip and gable roofs shed water thanks to gravitational force. Flat roofs, alternatively, accumulate rain water. Until the water is directed out and away from the flat roof structure, it will develop pools that may eventually leak and the amassed weight may subsequently result in compromising the integrity of the structure. That is why roofs with a slope of below 2% should have roof drains positioned in the lowest places on the roof in which water pools and should be uniformly spread all throughout the roof top.

Roof Drain Kinds


There are several distinct variations of roof drains. They generally fall into two groups: pitched roof drains and flat roof drains. Pitched roof rainwater drains usually consist of gutters that collect rainwater that passes by means of gravity to the roof periphery. Gutters channel this water towards downspouts which direct the water flow down and away from the structure or into sewers. Flat roof drains are one of three main types: scuppers, inner drains or siphonic drains.

Roof Rainwater Drain Scuppes


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

Interior Roof Drains


There are many kinds of inner drains for flat roofs. These are positioned at low places in the roof and attach to inner drainage pipes that direct water outdoors or in to a sewer system. Many models of inner roof drains have domes, strainers or covers which keep trash 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 constructed from PVC, cast iron or cast aluminum.

Siphonic Roof Drains

Siphonic roof drains are a more effective alternative to gravity drainage. Traditional flat roof drainage permits both air and water to go into the drain system creating 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 sized pipe diameters . When all of the air is removed, a negative air pressure in the tail portion of the drain is set up which pulls water off the roof siphonically. Although used primarily for flat roofs, siphonic drains can also be installed on pitched roofs.

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