Roof Drains


There are a number of distinct varieties of roof drains and roof drain dome in Piedmont, AL and each one is an unique approach to the variety of roof types and their drainage concerns. You should take into consideration the type of roof, its size, and its roof pitch to be able to choose the right drain. You also need to think about the site of the drain, how much rainwater is expected and safe practices when selecting a roof water drain for a house or commercial building.

Gable, dormer, mansard and hip roofs shed water because of gravitational force. Flat roofs, conversely, accumulate rain water. Until the water is directed out and away from the roof , it will most likely develop pools that may inevitably leak and the amassed weight may eventually cause damage to the structure. That is why roofs with a pitch of under 2% should have roof drains positioned at the lowest areas on the roof in which water puddles and need to be uniformly spaced throughout the roof surface.

Roof Drain Types


There are a number of distinct variations of roof drains. They generally fall into two groups: flat roof drains and pitched roof drains. Pitched roof rainwater drains normally comprise gutters that collect rainwater which travels by means of gravity to the roof periphery. Gutters transport this water towards downspouts which direct the water flow down and away from the structure or in to sewer lines. Flat roof drains are one of three primary types: scuppers, inner drains or siphonic drains.

Roof Drain Scuppers


Scuppers are located on a roof's periphery. They can also be put in on a balcony or terrace. Small openings are cut into the side of the roof structure so water can flow out and drain the roof top. Scuppers can attach to a downspout, or can be lengthened to make sure that water is guided away from the structure sides and foundation.

Interior Roof Drains


There are quite a few different types of inner drains for flat roofs. They are positioned at low spots on the roof and attach to inner drainage pipes that route water outdoors or in to a sewer system. Many styles of inner roof drains have domes, strainers or covers that prevent debris from blocking the roof drain pipe. These types of drains work via gravitational force channeling pooling water through 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 substitute for gravity drainage. Traditional flat roof drainage allows both air and water to go into the drain system creating pipe space 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 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 draws water off the roof siphonically. Although used mainly 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 dome in and around Piedmont, Alabama, give us a call. We'd be glad to help.