Roof Drains


At this time there are a few distinct kinds of roof water drains and cast iron roof drain in Dothan, AL and each one is a specific answer to the variety of roof styles and their drainage issues. You need to think about the type of roof, its dimensions, and its roof pitch to be able to select the correct drain. You also may want to think about the location of the drain, what amount of rainwater is anticipated and safe practices when selecting a roof drain for a residence or commercial building.

Gambrel, dormers, hip and gable roofs shed rainwater water due to gravity. Flat roofs, conversely, accumulate water. Until the water is directed out and away from the roof structure, it will create pools that could inevitably leak and the amassed weight may eventually result in structural damage. That is why roofs with a pitch of less than two percent should have roof drains located in the lowest spots on the roof where water pools and should be uniformly spread all throughout the roof top.

Roof Drain Types


There are a number of distinct alternatives of roof drains. They generally fall into 2 categories: pitched roof drains and flat roof drains. Pitched roof rainwater drains usually comprise gutters that collect rainwater that passes via gravity to the roof periphery. Gutters direct this water in the direction of downspouts which route the water flow down and far away from the building or into sewers. Flat roof drains can be 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 openings are cut in the side of the roof structure so that rain water can empty and drain the roof top. Scuppers can connect to a downspout, or could be extended to make sure that water is directed off of the building sides and foundation.

Interior Roof Drains


There are quite a few different types of inner drains for flat roofs. These are positioned at low spots on the roof and connect to interior drainage pipes that route water outdoors or into a sewer system. Several versions of inner roof drains have domes, strainers or covers which prevent debris from obstructing the roof drain pipe. These kinds of drains operate via gravitational force channeling standing water through the roof drain system. They are made of PVC, cast iron or cast aluminum.

Siphonic Roof Drains

Siphonic roof drains are a more efficient alternative to gravity drainage. Standard flat roof drainage permits both air and water to go into 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 produces a siphonic drain that eliminates 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 portion of the drain is set up which attracts water off the roof siphonically. Although used primarily for flat roofs, siphonic drains can also be installed on angled roofs.

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