Roof Drains


There are several distinct types of roof water drains and roof drain system in Fairfield, AL and each one is an unique answer to the variety of roof styles and their drainage concerns. You should look at the kind of roof, its dimensions, and its roof pitch to be able to choose the right drain. You also may want to take into account the site of the drain, what amount of rainwater is anticipated and safety when selecting a roof water drain for a residence or business structure.

Gable, dormer, mansard and hip roofs shed rainwater water thanks to gravity. Flat roofs, conversely, collect rain water. Unless the water is guided out and away from the flat roof structure, it will most likely create pools of water that could eventually leak and the amassed weight may subsequently cause structural damage. That is why roofs with a pitch of under 2% ought to have roof drains positioned at the lowest spots on the roof where water puddles and should be uniformly spaced throughout the roof top.

Types of Roof Drains


There are a number of different variations of roof drains. They basically fall into 2 groups: flat roof drains and pitched roof drains. Pitched roof rainwater drains normally comprise gutters that collect rainwater which passes via gravity to the roof edge. Gutters channel this water in the direction of downspouts which steer the water flow down and far away from the building or into sewer lines. Flat roof drains are one of three primary types: scuppers, inner drains or siphonic drains.

Roof Drain Scuppers


Scuppers are situated on a 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 water can empty and drain the roof surface. Scuppers can attach to a downspout, or could be lengthened so that water is directed away from the structure sides and foundation.

Inner Roof Drains


There are many kinds of inner drains for flat roofs. These are positioned at low spots on the roof and attach to inner drainage pipes that route water outside or into a sewer system. Several styles of inner roof drains have domes, strainers or covers which prevent trash from blocking the roof drain pipe. These types of drains work via gravitational force channeling pooling water thru the roof drain system. They can be constructed from PVC, cast iron or cast aluminum.

Siphonic Roof Drains

Siphonic roof drains are a more efficient alternative to gravity drainage. Standard flat roof drainage permits both air and water to enter the drain system producing pipe space occupied by both air and water. By incorporating an engineered baffle to the sump of the drain body it creates a siphonic drain that removes air from the system and allows for 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 pulls rainwater off the roof siphonically. Though used mainly for flat roofs, siphonic drains can also be installed on angled roofs.

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