Roof Drains


At this time there are a few different types of roof water drains and roof drain pvc in Gardendale, AL and each one is a specific approach to the variety of roof types and their drainage issues. You must think about the type of roof, its size, and the roof pitch to be able to choose the right drain. You also should take into consideration the location of the drain, how much rainwater is expected and safety when selecting a roof water drain for a home or business structure.

Gambrel, dormers, hip and gable roofs shed water thanks to gravitational force. Flat roofs, conversely, collect water. Until this water is directed out and away from the roof structure, it will develop pools that could eventually leak and the accumulated weight will subsequently result in compromising the integrity of the structure. That is why roofs with a pitch of below 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 surface.

Roof Drain Kinds


There are a number of different alternatives of roof drains. They generally fall into 2 groups: pitched roof drains and flat roof drains. Pitched roof rainwater drains usually comprise gutters which collect rainwater that passes by means of gravity to the roof periphery. Gutters transport this water in the direction of downspouts which direct the water flow down and away from the building or in to 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 put in on a balcony or terrace. Small openings are cut in the side of the roof structure so that water can empty and drain the roof top. Scuppers can connect to a downspout, or could be lengthened to make sure that water is guided off of the building sides and foundation.

Inner Roof Drains


There are many types of inner drains for flat roofs. They are positioned at low spots on the roof and attach to inner drainage pipes that direct water outside or in to a sewer system. Many designs of inner roof drains have domes, strainers or covers that prevent trash from clogging the roof drain pipe. These kinds of drains work via gravitational force channeling pooling 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 effective alternative to gravity drainage. Conventional flat roof drainage permits both air and water to enter 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 body it produces a siphonic drain that removes air from the system and allows for smaller pipe diameters to be used. When all of the air is removed, a negative air pressure in the tail piece of the drain is established which draws rainwater off the roof siphonically. Though 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 pvc in and around Gardendale, Alabama, give us a call. We'd be glad to help.