Roof Drains


At this time there are several distinct varieties of roof drains and roof drain system in Huntsville, AL and each one is an unique answer to the wide range of roof types and their drainage challenges. You need to consider the kind of roof, its dimensions, and its roof pitch to be able to choose the most suitable drain. You also need to take into consideration the location of the drain, what amount of rainwater is anticipated and safe practices when choosing a roof drain for a home or commercial building.

Hip roofs, dormers, gable and mansard roofs shed rainwater water because of gravity. Flat roofs, conversely, accumulate water. Unless this water is guided out and away from the roof structure, it will most likely create pools that could eventually leak and the amassed weight will subsequently result in compromising the integrity of the structure. That is why roofs with a pitch of under two percent ought to have roof drains located at the lowest places on the roof where water puddles and should be uniformly spread throughout the roof surface.

Kinds of Roof Drains


There are several distinct alternatives of roof drains. They generally fall into 2 categories: pitched roof drains and flat roof drains. Pitched roof drains normally consist of gutters which accumulate rainwater that passes by means of gravity to the roof periphery. Gutters direct this water in the direction of downspouts which direct the water flow down and away from the structure or in to 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 the roof's periphery. They can also be put in on a balcony or terrace. Small holes are cut into the side of the roof structure so that rain water can empty and drain the roof surface. Scuppers can connect to a downspout, or could be extended to make sure that water is directed away from the building sides and foundation.

Interior Roof Drains


There are many types of inner drains for flat roofs. These are installed at low places on the roof and attach to inner drainage pipes that direct water outside or into a sewer system. Many designs of internal roof drains have domes, strainers or covers which prevent trash from obstructing the roof drain pipe. These kinds of drains operate via gravity 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 effective alternative to gravity drainage. Conventional flat roof drainage allows both air and water to go into the drain system creating pipe space occupied by both air and water. By incorporating an engineered baffle to the sump of the drain system it produces a siphonic drain which eliminates 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 piece of the drain is established which draws water off the roof siphonically. Although used mainly for flat roofs, siphonic drains can also be installed on angled roofs.

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