Roof Drains


There are several different kinds of roof water drains and roof drain pan in Auburn, AL and each one is an unique answer to the wide range of roof styles and their drainage concerns. You need to consider the kind of roof, its size, and its roof pitch to be able to select the most suitable drain. You also should take into account the site of the drain, what amount of rainwater is expected and safe practices when choosing a roof drain for a home or business building.

Gable, dormer, mansard and hip roofs shed rainwater water due to gravity. Flat roofs, on the other hand, collect rain water. Until the water is directed out and away from the roof structure, it will most likely create pools of water that may eventually leak and the amassed weight will subsequently result in damage to the structure. That is why roofs with a pitch of less than two percent should have roof drains located at the lowest areas on the roof in which water puddles and need to be uniformly spread throughout the roof surface.

Types of Roof Drains


There are a number of different variations of roof drains. They basically fall into two categories: flat roof drains and pitched roof drains. Pitched roof drains normally comprise gutters which accumulate rainwater that passes by means of gravity to the roof periphery. Gutters transport 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 Rainwater Drain Scuppes


Scuppers are situated on a roof's periphery. They can also be put in on a balcony or terrace. Small openings are cut in the side of the roof structure so rain water can empty and drain the roof top. Scuppers can attach to a downspout, or can be extended so that water is directed away from the structure sides and foundation.

Inner Roof Drains


There are many types of inner drains for flat roofs. These are positioned at low spots on the roof and connect to interior drainage pipes that drive water outdoors or into a sewer system. Several designs of internal roof drains have domes, strainers or covers that prevent debris from blocking the roof drain pipe. These kinds 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 effective alternative to gravity drainage. Standard flat roof drainage allows 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 system it creates a siphonic drain that 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 draws 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 pan in and around Auburn, Alabama, give us a call. We'd be glad to help.