Roof Drains


There are several different varieties of roof drains and roof drain pvc in Saraland, AL and each one is a specific answer to the wide range of roof styles and their drainage issues. You should think about the kind of roof, its size, and the roof pitch to be able to pick the right drain. You also may want to think about the site of the drain, what amount of rainwater is anticipated and safety when choosing a roof water drain for a residence or commercial building.

Gambrel, dormers, hip and gable roofs shed rainwater water due to gravitational force. Flat roofs, alternatively, accumulate rain water. Unless this water is directed out and away from the roof structure, it will most likely create pools of water that could inevitably leak and the amassed weight will subsequently result in structural damage. That is the reason that roofs with a slope of less than two percent ought to have roof drains situated in the lowest places on the roof in which water puddles and should be uniformly spaced throughout the roof surface.

Types of Roof Drains


There are several different variations of roof drains. They basically fall into 2 groups: pitched roof drains and flat roof drains. Pitched roof rainwater drains usually consist of gutters which collect rainwater which passes by means of gravity down to the roof edge. Gutters channel this water in the direction of downspouts which steer 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 installed on a balcony or terrace. Small holes are cut into the side of the roof structure so that water can flow out and drain the roof top. Scuppers can hook up to a downspout, or can be extended so that water is guided away from the building sides and foundation.

Inner Roof Drains


There are many types of inner drains for flat roofs. These are installed at low places in the roof and connect to interior drainage pipes that drive water outside or in to a sewer system. Several styles of internal roof drains have domes, strainers or covers that keep debris from clogging the roof drain pipe. These kinds of drains operate via gravity channeling standing 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 efficient alternative to gravity drainage. Conventional flat roof drainage allows both air and water to go into the drain system producing 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 which removes air from the system and permits smaller sized 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 primarily for flat roofs, siphonic drains can also be set up on angled roofs.

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