Roof Drains


There are a few different varieties of roof water drains and roof drain pipe in Fairfield, AL and each one is an unique approach to the variety of roof types and their drainage challenges. You should think about the type of roof, its dimensions, and its roof pitch to be able to choose the most suitable drain. You also need to think about the site of the drain, what amount of rainwater is expected and safety when choosing a roof water drain for a residence or business structure.

Gambrel, dormers, hip and gable roofs shed rainwater water because of gravitational force. Flat roofs, on the other hand, accumulate water. Unless the water is routed 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 cause structural damage. That is why roofs with a slope of below two percent should have roof drains situated in the lowest areas on the roof in which water puddles and should be evenly spaced all throughout the roof surface.

Types of Roof Drains


There are several distinct variations of roof drains. They generally fall into two categories: flat roof drains and pitched roof drains. Pitched roof rainwater drains usually comprise gutters which accumulate rainwater that travels via gravity down to the roof periphery. Gutters direct this water in the direction of downspouts which direct the water flow down and away from the building or in to sewers. Flat roof drains are 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 put in on a balcony or terrace. Small holes are cut in the side of the roof structure so that rain water can flow out and drain the roof top. Scuppers can connect to a downspout, or could be lengthened to make sure that water is directed off of the structure sides and foundation.

Inner Roof Drains


There are many types of inner drains for flat roofs. They are installed at low areas on the roof and attach to interior drainage pipes that route water outside or into a sewer system. Several versions of internal roof drains have domes, strainers or covers that prevent trash from blocking the roof drain pipe. These kinds of drains work via gravity 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 substitute for gravity drainage. Standard 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 eliminates 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 portion of the drain is set up which attracts water off the roof siphonically. Though used primarily 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 pipe in and around Fairfield, Alabama, give us a call. We'd be glad to help.