Roof Drains


There are several different types of roof drains and roof drain dome in Jasper, AL and each one is a specific approach to the wide range of roof types and their drainage challenges. You should consider the type of roof, its dimensions, and the roof pitch to be able to choose the correct drain. You also may want to take into account the location of the drain, how much rainwater is anticipated and safety when selecting 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 water. Until this water is directed out and away from the flat roof , it will create pools that could eventually leak and the amassed weight may eventually cause compromising the integrity of the structure. That is the reason that roofs with a slope of below two percent should have roof drains positioned at the lowest areas on the roof in which water puddles and need to be uniformly spread throughout the roof surface.

Kinds of Roof Drains


There are several distinct alternatives of roof drains. They generally fall into two categories: pitched roof drains and flat roof drains. Pitched roof rainwater drains usually comprise gutters which accumulate rainwater which travels via gravity to the roof edge. Gutters direct this water in the direction of downspouts which steer the water flow down and far away from the structure or in to sewers. 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 put in on a balcony or terrace. Small holes are cut into the side of the roof structure so rain water can flow out and drain the roof top. Scuppers can attach to a downspout, or can be extended to make sure that water is guided away from the structure sides and foundation.

Inner Roof Drains


There are many kinds of inner drains for flat roofs. These are installed at low areas on the roof and attach to interior drainage pipes that route water outside or into a sewer system. Several designs of internal roof drains have domes, strainers or covers that prevent debris from blocking the roof drain pipe. These kinds of drains work via gravity funneling pooling water thru the roof drain system. They can be constructed from PVC, cast iron or cast aluminum.

Siphonic Roof Drains

Siphonic roof drains are a more effective alternative to 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 adding an engineered baffle to the sump of the drain body it creates a siphonic drain which eliminates air from the system and permits 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 established which pulls water off the roof siphonically. Though 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 dome in and around Jasper, Alabama, give us a call. We'd be glad to help.