Roof Drains


There are several different kinds of roof drains and roof drain scupper in Opelika, AL and each is a specific approach to the wide range of roof styles and their drainage issues. You must consider the type of roof, its size, and its roof pitch to be able to pick the right drain. You also should take into consideration the location of the drain, what amount of rainwater is anticipated and safe practices when choosing a roof water drain for a residence or commercial structure.

Gable, dormer, mansard and hip roofs shed water because of gravitational force. Flat roofs, alternatively, accumulate water. Unless the water is guided out and away from the flat roof structure, it will most likely create pools that could eventually leak and the accumulated weight will subsequently cause damage to the structure. That is why roofs with a pitch of under two percent should have roof drains positioned in the lowest spots on the roof in which water pools and should be uniformly spaced throughout the roof top.

Roof Drain Kinds


There are several distinct alternatives of roof drains. They generally fall into two groups: flat roof drains and pitched roof drains. Pitched roof rainwater drains usually consist of gutters that collect rainwater which passes by means of gravity down to the roof periphery. Gutters transport this water towards downspouts which route the water flow down and away from the building or into sewers. Flat roof drains are one of three main types: scuppers, inner drains or siphonic drains.

Roof Drain Scuppers


Scuppers are situated on the roof's periphery. Scuppers can also be placed on a balcony or terrace. Small openings are cut in the side of the roof structure so rain water can flow out and drain the roof surface. Scuppers can connect to a downspout, or could be extended to make sure that water is guided away from the structure sides and foundation.

Inner Roof Drains


There are many types of inner drains for flat roofs. They are installed at low places in the roof and connect to interior drainage pipes that drive water outdoors or into a sewer system. Many versions of inner roof drains have domes, strainers or covers which prevent trash from obstructing the roof drain pipe. These types of drains work via gravitational force funneling standing 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 efficient 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 body it produces a siphonic drain which removes air from the system and permits smaller sized pipe diameters to be used. When all air is eliminated, a negative air pressure in the tail portion of the drain is established which pulls 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 scupper in and around Opelika, Alabama, give us a call. We'd be glad to help.