Roof Drains


There are a number of different varieties of roof drains and roof drain scupper in Gadsden, AL and each one is an unique approach to the wide range of roof styles and their drainage challenges. You should look at the type of roof, its dimensions, and the roof pitch to be able to select the right drain. You also should take into consideration the site of the drain, what amount of rainwater is anticipated and safety when choosing a roof water drain for a house or business structure.

Gambrel, dormers, hip and gable roofs shed rainwater water due to gravitational force. Flat roofs, alternatively, accumulate rain water. Until the water is directed out and away from the flat roof , it will most likely develop pools of water that may eventually leak and the amassed weight will eventually cause compromising the integrity of the structure. That is why roofs with a slope of below two percent should have roof drains positioned in the lowest areas on the roof where water puddles and should be uniformly spaced throughout the roof surface.

Types of Roof Drains


There are a number of distinct alternatives of roof drains. They generally fall into two categories: pitched roof drains and flat roof drains. Pitched roof drains usually consist of gutters that accumulate rainwater which travels via gravity down to the roof periphery. Gutters direct this water towards downspouts which direct the water flow down and far away from the building or into sewer lines. Flat roof drains can be one of three main 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 water can empty and drain the roof top. Scuppers can connect to a downspout, or can be lengthened so that water is guided away from the structure sides and foundation.

Inner Roof Drains


There are quite a few different types of inner drains for flat roofs. They are positioned at low areas on the roof and connect to interior drainage pipes that route water outside or into a sewer system. Many models of inner roof drains have domes, strainers or covers which prevent debris from obstructing the roof drain pipe. These types of drains work via gravitational force funneling standing water through 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 substitute for gravity drainage. Conventional flat roof drainage allows both air and water to enter the drain system producing pipe space occupied by both air and water. By incorporating 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 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. Although used mainly for flat roofs, siphonic drains can also be installed on pitched roofs.

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