Roof Drains


There are a few different kinds of roof drains and roof drain scupper in Dothan, AL and each one is a specific answer to the variety of roof styles and their drainage concerns. You need to look at the kind of roof, its size, and its roof pitch to be able to choose the correct drain. You also may want to take into account the site of the drain, what amount of rainwater is expected and safe practices when choosing a roof water drain for a house or business structure.

Hip roofs, dormers, gable and mansard roofs shed water due to gravity. Flat roofs, conversely, collect rain water. Unless this water is guided out and away from the roof structure, it will develop pools of water that may inevitably leak and the accumulated weight will eventually result in structural damage. That is the reason that roofs with a slope of under 2% ought to have roof drains located at the lowest areas on the roof where water pools and should be evenly spread throughout the roof top.

Roof Drain Kinds


There are a number of different alternatives of roof drains. They generally fall into 2 categories: flat roof drains and pitched roof drains. Pitched roof rainwater drains usually comprise gutters which accumulate rainwater that travels via gravity down to the roof periphery. Gutters transport this water towards downspouts which direct the water flow down and far away from the building or in to sewers. 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 perimeter. They can also be placed on a balcony or terrace. Small openings are cut into the side of the roof structure so rain water can flow out and drain the roof top. Scuppers can attach to a downspout, or could be extended so that water is directed off of the structure sides and foundation.

Inner Roof Drains


There are many types of inner drains for flat roofs. These are installed at low areas on the roof and attach to inner drainage pipes that direct water outdoors or into a sewer system. Several models of inner roof drains have domes, strainers or covers which prevent trash from obstructing the roof drain pipe. These kinds of drains work via gravitational force funneling pooling water thru 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 to be used. When all air is eliminated, a negative air pressure in the tail portion of the drain is set up which pulls water 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 roof drain scupper in and around Dothan, Alabama, give us a call. We'd be glad to help.