Roof Drains


At this time there are a number of distinct varieties of roof water drains and roof drain system in Dothan, AL and each is an unique approach to the variety of roof types and their drainage issues. You should think about the type of roof, its size, and its roof pitch to be able to select the right drain. You also should think about 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.

Hip roofs, dormers, gable and mansard roofs shed water thanks to gravitational force. Flat roofs, alternatively, accumulate water. Unless this water is directed out and away from the roof structure, it will most likely develop pools that may inevitably leak and the accumulated weight will eventually cause damage to the structure. That is why roofs with a slope of less than 2% ought to have roof drains situated in the lowest spots on the roof where water pools and need to be evenly spread throughout the roof surface.

Types of Roof Drains


There are a number of different variations of roof drains. They basically fall into two groups: pitched roof drains and flat roof drains. Pitched roof rainwater drains usually comprise gutters that accumulate rainwater which travels by means of gravity down to the roof periphery. Gutters channel this water towards downspouts which route the water flow down and far away from the building or into sewer lines. Flat roof drains can be one of three main types: scuppers, inner drains or siphonic drains.

Roof Drain Scuppers


Scuppers are situated on a roof's periphery. 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 can be extended so that water is guided away from the building sides and foundation.

Inner Roof Drains


There are quite a few different types of inner drains for flat roofs. These are positioned at low places in the roof and connect to interior drainage pipes that drive water outside or into a sewer system. Many models of internal roof drains have domes, strainers or covers that prevent debris from blocking the roof drain pipe. These kinds of drains work via gravity funneling pooling water thru the roof drain system. They are made of PVC, cast iron or cast aluminum.

Siphonic Roof Drains

Siphonic roof drains are a more effective alternative to gravity drainage. Traditional flat roof drainage allows both air and water to enter the drain system producing pipe space occupied by both air and water. By incorporating an engineered baffle to the sump of the drain system it produces a siphonic drain which eliminates air from the system and permits smaller pipe diameters to be used. When all air is removed, a negative air pressure in the tail portion of the drain is established which draws water off the roof siphonically. Although 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 system in and around Dothan, Alabama, give us a call. We'd be glad to help.