Roof Drains


There are a few different varieties of roof water drains and roof drain dome in Athens, AL and each is a specific solution to the variety of roof types and their drainage issues. You must take into consideration the type of roof, its dimensions, and its roof pitch to be able to choose the correct drain. You also need to think about the location of the drain, how much rainwater is expected and safety when selecting a roof drain for a residence or business structure.

Gambrel, dormers, hip and gable roofs shed rainwater water thanks to gravity. Flat roofs, on the other hand, accumulate water. Until this water is routed out and away from the flat roof structure, it will develop pools that may eventually leak and the amassed weight will eventually result in structural damage. That is why roofs with a pitch of under 2% should have roof drains positioned in the lowest areas on the roof in which water puddles and need to be uniformly spaced throughout the roof top.

Kinds of Roof Drains


There are several different alternatives of roof drains. They generally fall into two categories: flat roof drains and pitched roof drains. Pitched roof rainwater drains normally consist of gutters that accumulate rainwater which travels by means of gravity to the roof periphery. Gutters channel this water towards downspouts which steer the water flow down and away from the structure or into sewers. Flat roof drains can be one of three primary types: scuppers, inner drains or siphonic drains.

Roof Drain Scuppers


Scuppers are located on the roof's perimeter. Scuppers can also be installed 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 lengthened so that water is directed away from the building sides and foundation.

Interior Roof Drains


There are quite a few different types of inner drains for flat roofs. These are installed at low spots on the roof and attach to inner drainage pipes that direct water outdoors or into a sewer system. Many versions of inner roof drains have domes, strainers or covers which keep trash from blocking the roof drain pipe. These types of drains operate via gravitational force channeling pooling water through the roof drain system. They are 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 permits 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 body it produces a siphonic drain which eliminates air from the system and permits smaller pipe diameters to be used. When all of the air is eliminated, 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 set up on pitched roofs.

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