Roof Drains


At this time there are a number of distinct types of roof drains and cast iron roof drain in Decatur, AL and each one is a specific solution to the variety of roof styles and their drainage issues. You must look at the type of roof, its size, and its roof pitch to be able to pick the correct drain. You also should think about the site of the drain, how much rainwater is expected and safety when choosing a roof water drain for a house or business structure.

Gambrel, dormers, hip and gable roofs shed rainwater water thanks to gravity. Flat roofs, conversely, collect water. Unless this water is directed out and away from the roof structure, it will most likely develop pools of water that may eventually leak and the accumulated weight may subsequently result in structural damage. That is why roofs with a slope of below two percent ought to have roof drains positioned at the lowest places on the roof where water pools and should be uniformly spread all throughout the roof surface.

Roof Drain Types


There are a number of distinct alternatives of roof drains. They generally fall into two categories: flat roof drains and pitched roof drains. Pitched roof drains normally comprise gutters that collect rainwater which travels via gravity to the roof periphery. Gutters direct this water towards downspouts which steer the water flow down and away from the structure or in to sewers. Flat roof drains are one of three main types: scuppers, inner drains or siphonic drains.

Roof Rainwater Drain Scuppes


Scuppers are situated on the roof's perimeter. Scuppers can also be placed on a balcony or terrace. Small holes are cut into the side of the roof structure so that rain water can flow out and drain the roof surface. Scuppers can attach to a downspout, or can be lengthened so that water is directed off of the building 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 in the roof and attach to interior drainage pipes that drive water outside or into a sewer system. Several designs of internal roof drains have domes, strainers or covers that prevent debris from clogging the roof drain pipe. These kinds of drains work via gravity funneling standing 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 substitute for 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 system it creates a siphonic drain which removes air from the system and permits smaller pipe diameters to be used. When all air is removed, a negative air pressure in the tail portion 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 angled roofs.

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