Roof Drains


There are several different types of roof drains and roof drain downspout in Anniston, AL and each one is a specific solution to the wide range of roof types and their drainage issues. You must think about the kind of roof, its size, and its roof pitch to be able to pick the right drain. You also may want to take into consideration the location of the drain, how much rainwater is anticipated and safe practices when choosing a roof drain for a house or commercial building.

Hip roofs, dormers, gable and mansard roofs shed rainwater water because of gravity. Flat roofs, alternatively, collect rain water. Until the water is routed out and away from the roof , it will create pools that could eventually leak and the amassed weight may subsequently result in damage to the structure. That is why roofs with a slope of below two percent ought to have roof drains situated in the lowest spots on the roof where water pools and need to be evenly spaced all throughout the roof surface.

Types of Roof Drains


There are several distinct variations of roof drains. They generally fall into two groups: flat roof drains and pitched roof drains. Pitched roof rainwater drains normally consist of gutters which accumulate rainwater that travels by means of gravity to the roof edge. Gutters direct this water towards downspouts which direct the water flow down and far away from the structure or in to sewer lines. Flat roof drains are one of three main types: scuppers, inner drains or siphonic drains.

Roof Rainwater Drain Scuppes


Scuppers are situated on a roof's perimeter. They can also be placed on a balcony or terrace. Small holes are cut in the side of the roof structure so rain water can flow out and drain the roof surface. Scuppers can attach to a downspout, or can be lengthened to make sure that water is directed away from the structure sides and foundation.

Inner Roof Drains


There are quite a few different kinds of inner drains for flat roofs. These are installed at low areas on the roof and connect to inner drainage pipes that route water outside or in to a sewer system. Many versions of internal roof drains have domes, strainers or covers that keep debris from clogging the roof drain pipe. These kinds of drains work via gravitational force channeling pooling water through the roof drain system. They can be constructed from 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 enter the drain system creating 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 allows for smaller sized pipe diameters . When all of the air is removed, a negative air pressure in the tail piece of the drain is set up which draws water off the roof siphonically. Though used primarily for flat roofs, siphonic drains can also be installed on pitched roofs.

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