Roof Drains


There are several different kinds of roof drains and roof drain scupper in Piedmont, AL and each one is a specific solution to the variety of roof styles and their drainage challenges. You must think about the kind of roof, its size, and its roof pitch to be able to choose the right drain. You also should think about the site of the drain, how much rainwater is anticipated and safety when choosing a roof drain for a residence or business structure.

Hip roofs, dormers, gable and mansard roofs shed rainwater water due to gravitational force. Flat roofs, alternatively, collect rain water. Unless the water is routed out and away from the roof structure, it will most likely create pools that could eventually leak and the amassed weight may subsequently cause structural damage. That is the reason that roofs with a pitch of below two percent should have roof drains positioned in the lowest spots on the roof where water puddles and need to be uniformly spaced throughout the roof surface.

Roof Drain Types


There are a number of distinct alternatives of roof drains. They basically fall into 2 groups: flat roof drains and pitched roof drains. Pitched roof drains normally consist of gutters that collect rainwater which passes via gravity to the roof edge. Gutters direct this water towards downspouts which route the water flow down and far away from the structure or into sewers. Flat roof drains can be one of three primary types: scuppers, inner drains or siphonic drains.

Roof Rainwater Drain Scuppes


Scuppers are situated on a roof's perimeter. Scuppers can also be installed on a balcony or terrace. Small holes are cut in the side of the roof structure so water can flow out and drain the roof top. Scuppers can hook up to a downspout, or could be extended so that water is directed away from the building sides and foundation.

Inner Roof Drains


There are quite a few different types of inner drains for flat roofs. These are positioned at low places in the roof and connect to interior drainage pipes that route water outside or into a sewer system. Many styles of internal roof drains have domes, strainers or covers that prevent trash from obstructing the roof drain pipe. These types of drains operate via gravitational force channeling pooling 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 efficient alternative to gravity drainage. Standard flat roof drainage permits both air and water to go into the drain system producing pipe space which is occupied by both air and water. By adding an engineered baffle to the sump of the drain body it creates a siphonic drain which removes air from the system and permits smaller sized pipe diameters to be used. When all of the air is removed, a negative air pressure in the tail portion of the drain is set up which pulls water 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 roof drain scupper in and around Piedmont, Alabama, give us a call. We'd be glad to help.