Roof Drains


At this time there are a number of different types of roof drains and roof drain cover in Muscle Shoals, AL and each one is a specific approach to the variety of roof styles and their drainage issues. You need to take into consideration the type of roof, its dimensions, and the roof pitch to be able to choose the most suitable drain. You also need to take into account the location of the drain, what amount of rainwater is anticipated and safety when choosing a roof drain for a house or business structure.

Gable, dormer, mansard and hip roofs shed water because of gravity. Flat roofs, on the other hand, accumulate water. Until the water is guided out and away from the roof , it will create pools of water that may eventually leak and the amassed weight may subsequently result in structural damage. That is why roofs with a slope of less than 2% should have roof drains located in the lowest spots on the roof where water pools and need to be uniformly spaced all throughout the roof surface.

Kinds of Roof Drains


There are several different variations of roof drains. They basically fall into two categories: pitched roof drains and flat roof drains. Pitched roof rainwater drains usually consist of gutters which collect rainwater that travels via gravity to the roof periphery. Gutters transport this water in the direction of downspouts which direct the water flow down and away from the building or into sewer lines. Flat roof drains are one of three primary types: scuppers, inner drains or siphonic drains.

Roof Drain Scuppers


Scuppers are situated on the roof's periphery. They can also be put in on a balcony or terrace. Small holes are cut into the side of the roof structure so water can empty and drain the roof top. Scuppers can attach to a downspout, or can be lengthened to make sure that water is directed off of the building sides and foundation.

Inner Roof Drains


There are quite a few different kinds of inner drains for flat roofs. They are installed at low places in the roof and connect to interior drainage pipes that direct water outside or in to a sewer system. Several models of inner roof drains have domes, strainers or covers which prevent debris from obstructing the roof drain pipe. These kinds of drains operate via gravitational force funneling pooling water thru the roof drain system. They can be made from PVC, cast iron or cast aluminum.

Siphonic Roof Drains

Siphonic roof drains are a more effective substitute for gravity drainage. Traditional flat roof drainage allows both air and water to enter 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 system it produces a siphonic drain that eliminates air from the system and allows for smaller sized pipe diameters to be used. When all air is eliminated, a negative air pressure in the tail piece of the drain is set up which pulls rainwater off the roof siphonically. Though used mainly for flat roofs, siphonic drains can also be installed on angled roofs.

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