Roof Drains


At this time there are several distinct types of roof water drains and roof drain dome in Oneonta, AL and each is an unique approach to the wide range of roof styles and their drainage concerns. You should take into consideration the kind of roof, its size, and its roof pitch to be able to select the most suitable drain. You also should take into consideration the site of the drain, what amount of rainwater is anticipated and safety when selecting a roof drain for a house or business building.

Hip roofs, dormers, gable and mansard roofs shed water thanks to gravitational force. Flat roofs, conversely, accumulate rain water. Until the water is guided out and away from the roof , it will most likely create pools of water that could inevitably leak and the amassed weight may subsequently result in structural damage. That is the reason that roofs with a pitch of less than two percent should have roof drains positioned at the lowest places on the roof where water pools and need to be uniformly spaced all throughout the roof top.

Types of Roof Drains


There are a number of distinct alternatives of roof drains. They basically fall into two categories: pitched roof drains and flat roof drains. Pitched roof rainwater drains usually comprise gutters which collect rainwater which travels via gravity down to the roof periphery. Gutters transport this water in the direction of downspouts which steer the water flow down and away from the structure or into sewers. Flat roof drains are one of three primary types: scuppers, inner drains or siphonic drains.

Roof Drain Scuppers


Scuppers are located on the roof's perimeter. They 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 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 quite a few different types of inner drains for flat roofs. They are installed at low spots in the roof and attach to inner drainage pipes that drive water outside or into a sewer system. Many models of inner roof drains have domes, strainers or covers that prevent trash from blocking the roof drain pipe. These types of drains work via gravitational force channeling pooling water thru the roof drain system. They can be made of PVC, cast iron or cast aluminum.

Siphonic Roof Drains

Siphonic roof drains are a more efficient substitute for gravity drainage. Traditional flat roof drainage allows both air and water to go into the drain system creating pipe space which is occupied by both air and water. By incorporating an engineered baffle to the sump of the drain body it creates a siphonic drain that removes air from the system and allows for smaller sized pipe diameters . When all air is removed, a negative air pressure in the tail piece of the drain is set up which draws 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 dome in and around Oneonta, Alabama, give us a call. We'd be glad to help.