Roof Drains


At this time there are a number of distinct varieties of roof drains and roof drain pvc in Decatur, AL and each is a specific approach to the wide range of roof styles and their drainage issues. You need to look at the type of roof, its dimensions, and the roof pitch to be able to select the most suitable drain. You also need to take into consideration the site of the drain, what amount of rainwater is anticipated and safe practices when selecting a roof water drain for a house or business building.

Gambrel, dormers, hip and gable roofs shed water thanks to gravity. Flat roofs, conversely, collect water. Unless this water is directed out and away from the roof , it will most likely create pools that could inevitably leak and the accumulated weight will subsequently result in damage to the structure. That is why roofs with a slope of below 2% should have roof drains positioned at the lowest areas on the roof where water puddles and need to be uniformly spaced all throughout the roof top.

Roof Drain Kinds


There are several distinct variations of roof drains. They generally fall into two categories: flat roof drains and pitched roof drains. Pitched roof rainwater drains normally comprise gutters which accumulate rainwater that passes by means of gravity down to the roof periphery. Gutters direct this water towards downspouts which route the water flow down and far away from the structure or in to sewer lines. Flat roof drains can be one of three primary types: scuppers, inner drains or siphonic drains.

Roof Rainwater Drain Scuppes


Scuppers are located on the roof's perimeter. 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 empty and drain the roof surface. Scuppers can hook up to a downspout, or could be lengthened to make sure that water is directed off of the building sides and foundation.

Interior Roof Drains


There are many types of inner drains for flat roofs. They are installed at low places in the roof and connect to inner drainage pipes that direct water outside or into a sewer system. Many versions of inner roof drains have domes, strainers or covers which keep trash from clogging the roof drain pipe. These kinds of drains work via gravity channeling pooling water through 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. Standard flat roof drainage permits both air and water to go into 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 produces a siphonic drain that eliminates air from the system and permits smaller sized pipe diameters to be used. When all air is eliminated, a negative air pressure in the tail piece of the drain is established which draws water off the roof siphonically. Though 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 pvc in and around Decatur, Alabama, give us a call. We'd be glad to help.