Roof Drains


At this time there are several distinct kinds of roof water drains and roof drain pan in Killen, AL and each is an unique solution to the wide range of roof types and their drainage challenges. You need to think about the type of roof, its size, and its roof pitch to be able to select the most suitable drain. You also need to take into account the location of the drain, what amount of rainwater is expected and safe practices when selecting a roof water drain for a home or commercial building.

Gable, dormer, mansard and hip roofs shed rainwater water because of gravity. Flat roofs, conversely, accumulate rain water. Until this water is guided out and away from the roof , it will most likely create pools of water that may inevitably leak and the amassed weight may eventually cause compromising the integrity of the structure. That is why roofs with a slope of below 2% should have roof drains situated in the lowest places on the roof where water puddles and need to be evenly spread all throughout the roof top.

Kinds of Roof Drains


There are several different alternatives of roof drains. They basically fall into 2 categories: pitched roof drains and flat roof drains. Pitched roof drains usually consist of gutters which collect rainwater which travels via gravity to the roof edge. Gutters direct this water towards downspouts which steer the water flow down and far away from the structure or in to sewer lines. Flat roof drains are one of three main types: scuppers, inner drains or siphonic drains.

Roof Drain Scuppers


Scuppers are located on a roof's periphery. Scuppers can also be placed on a balcony or terrace. Small openings are cut into the side of the roof structure so that water can flow out and drain the roof top. Scuppers can hook up to a downspout, or can be lengthened so that water is directed off of the structure sides and foundation.

Interior Roof Drains


There are many kinds of inner drains for flat roofs. They are installed at low areas in the roof and attach to inner drainage pipes that drive water outside or in to a sewer system. Many styles of internal roof drains have domes, strainers or covers that keep trash from obstructing the roof drain pipe. These kinds of drains work via gravitational force channeling pooling 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 substitute for gravity drainage. Traditional flat roof drainage allows both air and water to go into the drain system creating 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 removes air from the system and allows for smaller pipe diameters to be used. When all air is eliminated, a negative air pressure in the tail piece of the drain is set up which pulls rainwater off the roof siphonically. Though used primarily 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 pan in and around Killen, Alabama, give us a call. We'd be glad to help.