Roof Drains


There are a few different types of roof water drains and roof drain dome in Decatur, AL and each one is an unique answer to the wide range of roof types and their drainage challenges. You should take into consideration the type of roof, its dimensions, and its roof pitch to be able to choose the correct drain. You also may want to think about the site of the drain, what amount of rainwater is anticipated and safety when choosing a roof drain for a home or business structure.

Gable, dormer, mansard and hip roofs shed rainwater water thanks to gravitational force. Flat roofs, conversely, collect rain water. Until this water is routed out and away from the roof , it will create pools that may inevitably leak and the amassed weight will eventually result in compromising the integrity of the structure. That is the reason that roofs with a pitch of under two percent ought to have roof drains positioned in the lowest places on the roof in which water pools and should be uniformly spaced throughout the roof top.

Roof Drain Types


There are several distinct variations of roof drains. They generally fall into 2 categories: pitched roof drains and flat roof drains. Pitched roof rainwater drains normally consist of gutters which accumulate rainwater which passes by means of gravity to the roof edge. Gutters channel this water towards downspouts which route the water flow down and far away from the structure or in to sewers. Flat roof drains are one of three primary types: scuppers, inner drains or siphonic drains.

Roof Drain Scuppers


Scuppers are located on the roof's perimeter. They can also be placed on a balcony or terrace. Small openings are cut into the side of the roof structure so rain water can empty 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 installed at low places on the roof and attach to interior drainage pipes that drive water outside or into a sewer system. Several versions of inner roof drains have domes, strainers or covers which prevent debris from obstructing the roof drain pipe. These types of drains operate via gravitational force funneling standing water thru the roof drain system. They are made from PVC, cast iron or cast aluminum.

Siphonic Roof Drains

Siphonic roof drains are a more efficient alternative to gravity drainage. Conventional flat roof drainage allows both air and water to go into the drain system producing pipe space occupied by both air and water. By adding an engineered baffle to the sump of the drain body it produces a siphonic drain which eliminates air from the system and permits smaller pipe diameters to be used. When all of the air is eliminated, a negative air pressure in the tail piece of the drain is established which pulls rainwater off the roof siphonically. Although used primarily for flat roofs, siphonic drains can also be installed on angled roofs.

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