Roof Drains


There are a few distinct varieties of roof drains and roof drain system in Oneonta, AL and each one is a specific answer to the wide range of roof types and their drainage concerns. You must take into consideration the type of roof, its dimensions, and the roof pitch to be able to select the correct drain. You also may want to think about the site of the drain, how much rainwater is expected and safe practices when selecting a roof water drain for a residence or business building.

Gambrel, dormers, hip and gable roofs shed rainwater water thanks to gravity. Flat roofs, on the other hand, collect water. Until this water is routed out and away from the flat roof , it will create pools of water that could inevitably leak and the amassed weight may subsequently result in structural damage. That is why roofs with a pitch of below two percent ought to have roof drains located at the lowest areas on the roof where water puddles and should be evenly spread throughout the roof top.

Types of Roof Drains


There are several different variations of roof drains. They generally fall into 2 categories: flat roof drains and pitched roof drains. Pitched roof drains usually comprise gutters which collect rainwater that travels via gravity to the roof edge. Gutters transport this water towards downspouts which steer the water flow down and far away from the building or into sewer lines. Flat roof drains can be one of three primary types: scuppers, inner drains or siphonic drains.

Roof Drain Scuppers


Scuppers are situated on a roof's periphery. Scuppers can also be placed on a balcony or terrace. Small openings are cut into the side of the roof structure so that rain water can flow out and drain the roof top. Scuppers can connect to a downspout, or can be extended so that water is guided off of the building sides and foundation.

Inner Roof Drains


There are quite a few different kinds 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 into a sewer system. Many versions of inner roof drains have domes, strainers or covers that prevent debris from blocking the roof drain pipe. These kinds of drains work via gravity channeling standing 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. Standard flat roof drainage allows both air and water to enter the drain system producing pipe space which is occupied by both air and water. By adding an engineered baffle to the sump of the drain body it creates 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 piece of the drain is established which draws rainwater off the roof siphonically. Though used primarily for flat roofs, siphonic drains can also be installed on angled roofs.

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