Roof Drains


There are a few different varieties of roof drains and cast iron roof drain in Gardendale, AL and each one is a specific answer to the wide range of roof types and their drainage issues. You must consider 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 selecting a roof drain for a house or commercial structure.

Gambrel, dormers, hip and gable roofs shed rainwater water due to gravitational force. Flat roofs, on the other hand, accumulate rain water. Unless this water is routed out and away from the flat roof , it will develop pools of water that could eventually leak and the accumulated weight may eventually result in damage to the structure. That is the reason that roofs with a slope of less than two percent should have roof drains located at the lowest places on the roof in which water pools and need to be evenly spread all throughout the roof surface.

Kinds of Roof Drains


There are several distinct alternatives of roof drains. They generally fall into 2 groups: flat roof drains and pitched roof drains. Pitched roof rainwater drains usually consist of gutters which accumulate rainwater which travels via gravity down to the roof edge. Gutters transport this water towards downspouts which route 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 perimeter. They can also be installed 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 surface. Scuppers can connect to a downspout, or could be lengthened to make sure that water is guided away from the structure sides and foundation.

Interior Roof Drains


There are quite a few different kinds of inner drains for flat roofs. These are positioned at low areas on the roof and connect to inner drainage pipes that route water outdoors or into a sewer system. Several styles of inner roof drains have domes, strainers or covers that keep debris from clogging the roof drain pipe. These types of drains operate via gravity channeling pooling 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. Conventional flat roof drainage allows both air and water to go into the drain system producing pipe space 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 pipe diameters . When all of the air is removed, a negative air pressure in the tail piece of the drain is established 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 Gardendale, Alabama, give us a call. We'd be glad to help.