Roof Drains


At this time there are a few different kinds of roof drains and roof drain downspout in Gadsden, AL and each is an unique answer to the wide range of roof types and their drainage issues. You must take into consideration the type of roof, its size, and its roof pitch to be able to choose the correct drain. You also may want to think about the site of the drain, how much rainwater is expected and safe practices when selecting a roof drain for a house or business structure.

Gable, dormer, mansard and hip roofs shed rainwater water because of gravity. Flat roofs, alternatively, collect water. Unless the water is directed out and away from the flat roof , it will most likely develop pools of water that could inevitably leak and the accumulated weight will subsequently result in structural damage. That is the reason that roofs with a pitch of less than 2% should have roof drains situated in the lowest areas on the roof in which water pools and should be evenly spaced throughout the roof surface.

Kinds of Roof Drains


There are a number of different variations of roof drains. They generally fall into two categories: pitched roof drains and flat roof drains. Pitched roof rainwater drains usually comprise gutters that collect rainwater which passes via gravity to the roof periphery. Gutters channel this water towards downspouts which route the water flow down and far away from the structure or into sewer lines. Flat roof drains can be one of three primary types: scuppers, inner drains or siphonic drains.

Roof Rainwater Drain Scuppes


Scuppers are situated on the roof's periphery. Scuppers can also be put in 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 surface. Scuppers can hook up to a downspout, or could be lengthened so that water is directed off of the building sides and foundation.

Interior 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 attach to inner drainage pipes that route water outside or into a sewer system. Several versions of inner roof drains have domes, strainers or covers which keep debris from obstructing the roof drain pipe. These kinds of drains work via gravitational force funneling standing water thru the roof drain system. They can be made 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 producing 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 which removes air from the system and permits smaller pipe diameters . When all air is eliminated, a negative air pressure in the tail portion of the drain is set up which draws rainwater off the roof siphonically. Although 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 downspout in and around Gadsden, Alabama, give us a call. We'd be glad to help.