Roof Drains


There are a few different types of roof drains and roof drain pvc in Gadsden, AL and each is an unique solution to the wide range of roof types and their drainage concerns. You should take into consideration the kind of roof, its dimensions, and its roof pitch to be able to choose the right drain. You also may want to take into consideration the site of the drain, how much rainwater is anticipated and safety when selecting a roof drain for a house or business structure.

Gable, dormer, mansard and hip roofs shed rainwater water thanks to gravity. Flat roofs, on the other hand, accumulate water. Until this water is directed out and away from the roof structure, it will most likely develop pools of water that could inevitably leak and the amassed weight may subsequently cause structural damage. That is why roofs with a slope of under two percent should have roof drains located at the lowest spots on the roof where water pools and need to be uniformly spread all throughout the roof top.

Roof Drain Types


There are a number of different variations of roof drains. They generally fall into 2 groups: flat roof drains and pitched roof drains. Pitched roof drains normally comprise gutters that collect rainwater that travels by means of gravity to the roof periphery. Gutters channel this water in the direction of downspouts which steer the water flow down and far away from the structure or into sewer lines. Flat roof drains can be one of three main types: scuppers, inner drains or siphonic drains.

Roof Rainwater Drain Scuppes


Scuppers are situated on the roof's perimeter. Scuppers can also be installed on a balcony or terrace. Small openings are cut in the side of the roof structure so that water can flow out and drain the roof surface. Scuppers can attach to a downspout, or could be extended so that water is guided off of the building sides and foundation.

Inner Roof Drains


There are many kinds of inner drains for flat roofs. They are installed at low places on the roof and connect to interior drainage pipes that direct water outside or into a sewer system. Several styles of inner roof drains have domes, strainers or covers that prevent trash from clogging the roof drain pipe. These kinds of drains operate via gravity channeling pooling 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 efficient 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 body it creates a siphonic drain that removes air from the system and permits smaller pipe diameters to be used. When all of the air is removed, a negative air pressure in the tail portion of the drain is set up which pulls water off the roof siphonically. Though used mainly for flat roofs, siphonic drains can also be installed on pitched roofs.

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