Roof Drains


There are several different types of roof drains and roof drain downspout in Killen, AL and each one is an unique answer to the wide range of roof types and their drainage issues. You should look at the type of roof, its size, and the roof pitch to be able to select the most suitable drain. You also should think about the location of the drain, what amount of rainwater is anticipated and safe practices when selecting a roof water drain for a residence or business building.

Gambrel, dormers, hip and gable roofs shed water due to gravity. Flat roofs, on the other hand, collect water. Until the water is guided out and away from the flat roof , it will create pools of water that could eventually leak and the accumulated weight will eventually cause compromising the integrity of the structure. That is why roofs with a slope of below 2% ought to have roof drains positioned in the lowest spots on the roof in which water pools and need to be uniformly spaced throughout the roof surface.

Types of Roof Drains


There are several different alternatives of roof drains. They basically fall into two groups: flat roof drains and pitched roof drains. Pitched roof drains usually consist of gutters that accumulate rainwater that passes via gravity down to the roof periphery. Gutters transport this water in the direction of downspouts which route 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 Rainwater Drain Scuppes


Scuppers are located on the roof's perimeter. They can also be placed on a balcony or terrace. Small openings are cut in the side of the roof structure so rain water can flow out and drain the roof surface. Scuppers can connect to a downspout, or could be extended so that water is guided away from the building sides and foundation.

Inner Roof Drains


There are quite a few different kinds of inner drains for flat roofs. They are positioned at low spots on the roof and connect to inner drainage pipes that drive water outside or into a sewer system. Many styles of internal roof drains have domes, strainers or covers which keep trash from obstructing the roof drain pipe. These types of drains work 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 effective alternative to gravity drainage. Conventional flat roof drainage permits both air and water to enter the drain system producing pipe space occupied by both air and water. By adding an engineered baffle to the sump of the drain body it creates a siphonic drain that eliminates air from the system and allows for smaller pipe diameters to be used. When all of the air is removed, a negative air pressure in the tail piece of the drain is established which pulls water off the roof siphonically. Although 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 downspout in and around Killen, Alabama, give us a call. We'd be glad to help.