Roof Drains


There are several distinct varieties of roof water drains and cast iron roof drain in Huntsville, AL and each is an unique answer to the wide range of roof styles and their drainage issues. You need to look at the kind of roof, its dimensions, and the roof pitch to be able to select the most suitable drain. You also should think about the location of the drain, what amount of rainwater is expected and safe practices when choosing a roof drain for a home or business building.

Gambrel, dormers, hip and gable roofs shed rainwater water because of gravitational force. Flat roofs, conversely, accumulate rain water. Unless the water is guided out and away from the roof structure, it will most likely develop pools that could inevitably leak and the amassed weight may subsequently cause compromising the integrity of the structure. That is the reason that roofs with a pitch of under two percent ought to have roof drains located at the lowest places on the roof in which water puddles and should be uniformly spaced all throughout the roof top.

Kinds of Roof Drains


There are several different alternatives of roof drains. They basically fall into two categories: flat roof drains and pitched roof drains. Pitched roof drains usually consist of gutters which accumulate rainwater which passes via gravity down to the roof edge. Gutters transport this water towards downspouts which steer the water flow down and far away from the structure or in to sewer lines. Flat roof drains can be one of three main types: scuppers, inner drains or siphonic drains.

Roof Rainwater Drain Scuppes


Scuppers are located on the roof's perimeter. They can also be put in on a balcony or terrace. Small holes are cut into the side of the roof structure so that water can flow out and drain the roof surface. Scuppers can connect to a downspout, or can be lengthened to make sure that water is guided away from the structure 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 interior drainage pipes that drive water outdoors or into a sewer system. Several models of inner roof drains have domes, strainers or covers that keep debris from blocking the roof drain pipe. These types of drains operate via gravity funneling standing water thru the roof drain system. They can be made of PVC, cast iron or cast aluminum.

Siphonic Roof Drains

Siphonic roof drains are a more effective alternative to 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 adding 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 set up which draws rainwater off the roof siphonically. Though used primarily for flat roofs, siphonic drains can also be set up on pitched roofs.

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