Roof Drains


At this time there are several distinct kinds of roof water drains and cast iron roof drain in Florence, AL and each one is an unique solution to the variety of roof types and their drainage challenges. You must consider the kind of roof, its dimensions, and the roof pitch to be able to pick the right drain. You also need to think about the location of the drain, how much rainwater is expected and safe practices when choosing a roof drain for a home or commercial structure.

Hip roofs, dormers, gable and mansard roofs shed rainwater water because of gravity. Flat roofs, alternatively, collect water. Unless this water is directed out and away from the flat roof structure, it will most likely create pools that could inevitably leak and the amassed weight will eventually cause structural damage. That is the reason that roofs with a slope of below 2% ought to have roof drains positioned in the lowest places on the roof in which water pools and should be uniformly spread all throughout the roof top.

Roof Drain Types


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 which collect rainwater that travels via gravity to the roof edge. Gutters direct this water in the direction of downspouts which direct the water flow down and far away from the structure or in to sewers. Flat roof drains can be one of three primary types: scuppers, inner drains or siphonic drains.

Roof Drain Scuppers


Scuppers are located on a roof's periphery. They can also be placed on a balcony or terrace. Small openings are cut into the side of the roof structure so water can flow out and drain the roof top. Scuppers can hook up to a downspout, or could be lengthened to make sure that water is guided off of the structure sides and foundation.

Interior Roof Drains


There are many kinds of inner drains for flat roofs. They are positioned at low spots on the roof and attach to interior drainage pipes that direct water outside or into a sewer system. Several styles of internal roof drains have domes, strainers or covers which prevent debris from clogging the roof drain pipe. These kinds of drains operate via gravitational force funneling pooling water thru the roof drain system. They are constructed from PVC, cast iron or cast aluminum.

Siphonic Roof Drains

Siphonic roof drains are a more effective substitute for gravity drainage. Conventional flat roof drainage allows both air and water to enter 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 system it produces a siphonic drain that eliminates air from the system and allows for smaller sized pipe diameters to be used. When all air is removed, a negative air pressure in the tail portion of the drain is set up which draws rainwater off the roof siphonically. Although 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 cast iron roof drain in and around Florence, Alabama, give us a call. We'd be glad to help.