Roof Drains


There are a few different types of roof drains and cast iron roof drain in Muscle Shoals, AL and each one is an unique approach to the variety of roof types and their drainage issues. You must think about the type of roof, its dimensions, and its roof pitch to be able to choose the right drain. You also need to take into account the location of the drain, how much rainwater is expected and safety when choosing a roof water drain for a residence or business structure.

Gable, dormer, mansard and hip roofs shed rainwater water thanks to gravity. Flat roofs, on the other hand, collect rain water. Unless this water is routed out and away from the roof structure, it will develop pools that may eventually leak and the accumulated weight may subsequently result in damage to the structure. That is why roofs with a slope of under two percent should have roof drains positioned at the lowest places on the roof where water pools and need to be uniformly spread throughout the roof top.

Roof Drain Types


There are several different 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 which accumulate rainwater that travels by means of gravity to the roof edge. Gutters channel this water towards downspouts which direct the water flow down and 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 Rainwater Drain Scuppes


Scuppers are located on a roof's perimeter. They can also be installed on a balcony or terrace. Small openings are cut into the side of the roof structure so rain water can empty and drain the roof surface. Scuppers can attach to a downspout, or could be lengthened so that water is directed away from the building sides and foundation.

Interior Roof Drains


There are quite a few different kinds of inner drains for flat roofs. These are positioned at low places in the roof and attach to inner drainage pipes that drive water outside or in to a sewer system. Many designs of internal roof drains have domes, strainers or covers that prevent trash from blocking the roof drain pipe. These types of drains work 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 alternative to gravity drainage. Conventional 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 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 sized pipe diameters to be used. When all of the air is removed, a negative air pressure in the tail portion of the drain is set up which pulls rainwater off the roof siphonically. Although used mainly for flat roofs, siphonic drains can also be set up on pitched roofs.

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