Roof Drains


At this time there are a number of distinct kinds of roof water drains and roof drain scupper in Decatur, AL and each one is a specific solution to the wide range of roof styles and their drainage challenges. You should think about the kind of roof, its size, and its roof pitch to be able to select the correct drain. You also need to take into consideration the location of the drain, what amount of rainwater is anticipated and safety when selecting a roof drain for a residence or business structure.

Hip roofs, dormers, gable and mansard roofs shed water because of gravity. Flat roofs, on the other hand, accumulate water. Unless the water is routed out and away from the roof structure, it will develop pools that could inevitably leak and the amassed weight will eventually cause compromising the integrity of the structure. That is the reason that roofs with a slope of less than 2% should have roof drains located in the lowest areas on the roof where water puddles and need to be uniformly spaced throughout the roof surface.

Kinds of Roof Drains


There are a number of different variations of roof drains. They basically fall into 2 groups: pitched roof drains and flat roof drains. Pitched roof rainwater drains normally comprise gutters which collect rainwater which passes by means of gravity down to the roof periphery. Gutters channel this water towards downspouts which steer the water flow down and far away from the structure or in to sewers. Flat roof drains are one of three primary types: scuppers, inner drains or siphonic drains.

Roof Drain Scuppers


Scuppers are situated on a roof's periphery. Scuppers can also be installed on a balcony or terrace. Small holes are cut into the side of the roof structure so rain water can empty and drain the roof top. Scuppers can hook up to a downspout, or can be extended to make sure that water is guided away from the structure sides and foundation.

Inner Roof Drains


There are quite a few different types of inner drains for flat roofs. They are positioned at low places in the roof and connect to inner drainage pipes that drive water outdoors or into a sewer system. Several designs of inner roof drains have domes, strainers or covers that prevent debris from clogging the roof drain pipe. These types of drains operate via gravity funneling standing water through 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 allows both air and water to go into the drain system creating pipe space occupied by both air and water. By adding an engineered baffle to the sump of the drain system it produces a siphonic drain that removes air from the system and allows for smaller pipe diameters to be used. When all air is removed, a negative air pressure in the tail portion of the drain is set up which pulls rainwater off the roof siphonically. Though 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 scupper in and around Decatur, Alabama, give us a call. We'd be glad to help.