Roof Drains


At this time there are several distinct varieties of roof drains and roof drain pipe in Harvest, AL and each is an unique approach to the variety of roof styles and their drainage challenges. You must look at the kind of roof, its dimensions, and its roof pitch to be able to choose the right drain. You also need to think about the site of the drain, how much rainwater is expected and safety when choosing a roof drain for a home or commercial structure.

Gambrel, dormers, hip and gable roofs shed water thanks to gravity. Flat roofs, on the other hand, collect water. Until this water is guided out and away from the flat roof , it will most likely create pools that could eventually leak and the amassed weight may eventually cause damage to the structure. That is why roofs with a slope of under two percent should have roof drains situated in the lowest areas on the roof in which water puddles and should be evenly spaced throughout the roof surface.

Types of Roof Drains


There are several different alternatives of roof drains. They generally fall into two groups: flat roof drains and pitched roof drains. Pitched roof rainwater drains normally consist of gutters that accumulate rainwater which travels by means of gravity to the roof edge. Gutters transport this water towards downspouts which steer the water flow down and away from the structure or into sewers. Flat roof drains can be one of three main types: scuppers, inner drains or siphonic drains.

Roof Drain Scuppers


Scuppers are located on a roof's periphery. They can also be installed on a balcony or terrace. Small openings are cut in the side of the roof structure so water can empty and drain the roof top. Scuppers can hook up to a downspout, or can be lengthened so that water is guided off of the building sides and foundation.

Inner Roof Drains


There are many types of inner drains for flat roofs. These are positioned at low areas on the roof and attach to inner drainage pipes that direct water outside or into a sewer system. Many versions of internal roof drains have domes, strainers or covers that prevent trash from obstructing the roof drain pipe. These kinds of drains work via gravity channeling 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 substitute for gravity drainage. Traditional flat roof drainage allows both air and water to go into 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 that eliminates air from the system and allows for smaller pipe diameters . When all of the air is eliminated, a negative air pressure in the tail portion of the drain is established which attracts rainwater off the roof siphonically. Although used mainly for flat roofs, siphonic drains can also be installed on pitched roofs.

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