Roof Drains


At this time there are a number of distinct kinds of roof drains and roof drain system in Helena, AL and each is an unique answer to the wide range of roof types and their drainage concerns. You should take into consideration the kind of roof, its dimensions, and its roof pitch to be able to pick the most suitable drain. You also should take into account the site of the drain, how much rainwater is anticipated and safety when selecting a roof drain for a house or commercial building.

Gambrel, dormers, hip and gable roofs shed rainwater water thanks to gravity. Flat roofs, alternatively, collect rain water. Unless this water is routed out and away from the roof , it will most likely create pools that may inevitably leak and the accumulated weight will subsequently result in structural damage. That is the reason that roofs with a pitch of less than two percent ought to have roof drains located in the lowest spots on the roof in which water puddles and need to be uniformly spread throughout the roof surface.

Roof Drain Types


There are a number of distinct variations of roof drains. They basically fall into two categories: pitched roof drains and flat roof drains. Pitched roof rainwater drains usually consist of gutters that collect rainwater which passes by means of gravity to the roof edge. Gutters transport this water in the direction of downspouts which route the water flow down and far away from the building or into sewers. Flat roof drains can be one of three main types: scuppers, inner drains or siphonic drains.

Roof Rainwater Drain Scuppes


Scuppers are located on a 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 rain water can flow out and drain the roof surface. Scuppers can attach to a downspout, or can be extended so that water is directed off of the structure sides and foundation.

Inner Roof Drains


There are quite a few different kinds of inner drains for flat roofs. They are installed at low areas on the roof and attach to interior drainage pipes that direct water outdoors or in to a sewer system. Several styles of internal roof drains have domes, strainers or covers that keep debris from obstructing the roof drain pipe. These types of drains work via gravitational force channeling standing water thru the roof drain system. They are 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 allows 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 system it creates a siphonic drain that eliminates air from the system and allows for smaller sized pipe diameters to be used. When all of the air is eliminated, a negative air pressure in the tail piece of the drain is set up which attracts water off the roof siphonically. Though used mainly for flat roofs, siphonic drains can also be set up on angled roofs.

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