Roof Drains


There are several distinct types of roof drains and roof drain strainer in Helena, AL and each is a specific solution to the wide range of roof types and their drainage challenges. You must take into consideration the type of roof, its size, and the roof pitch to be able to choose the most suitable drain. You also should think about 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 water thanks to gravitational force. Flat roofs, on the other hand, accumulate rain water. Unless this water is routed out and away from the roof structure, it will create pools that may inevitably leak and the amassed weight may subsequently result in structural damage. That is why roofs with a slope of less than 2% should have roof drains positioned in the lowest areas on the roof in which water pools and should be evenly spaced all throughout the roof surface.

Types of Roof Drains


There are several distinct variations of roof drains. They basically fall into two categories: flat roof drains and pitched roof drains. Pitched roof drains usually comprise gutters that accumulate rainwater that travels by means of gravity to the roof edge. Gutters transport this water in the direction of downspouts which direct the water flow down and far away from the building or in to sewers. Flat roof drains are one of three primary types: scuppers, inner drains or siphonic drains.

Roof Rainwater Drain Scuppes


Scuppers are located on a roof's periphery. They can also be put in on a balcony or terrace. Small openings are cut in the side of the roof structure so water can flow out and drain the roof surface. Scuppers can connect to a downspout, or could be extended so that water is guided away from the structure sides and foundation.

Inner Roof Drains


There are quite a few different kinds of inner drains for flat roofs. They are positioned at low areas in the roof and connect to inner drainage pipes that route water outside or into a sewer system. Many designs of inner roof drains have domes, strainers or covers which keep trash from blocking the roof drain pipe. These kinds of drains work 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 effective substitute for gravity drainage. Standard flat roof drainage allows both air and water to go into the drain system creating pipe space which is occupied by both air and water. By incorporating an engineered baffle to the sump of the drain body it creates a siphonic drain that eliminates air from the system and permits smaller sized pipe diameters . When all 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 set up on pitched roofs.

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