Roof Drains


There are a number of distinct kinds of roof drains and cast iron roof drain in Alabaster, AL and each one is an unique approach to the wide range of roof types and their drainage concerns. You should think about the kind of roof, its dimensions, and the roof pitch to be able to choose the most suitable drain. You also may want to take into consideration the site of the drain, what amount of rainwater is anticipated and safe practices when selecting a roof drain for a house or commercial building.

Hip roofs, dormers, gable and mansard roofs shed rainwater water because of gravitational force. Flat roofs, on the other hand, accumulate water. Until the water is guided out and away from the flat roof structure, it will create pools of water that could eventually leak and the accumulated weight may eventually cause compromising the integrity of the structure. That is why roofs with a slope of below 2% ought to have roof drains located in the lowest spots on the roof in which water pools and need to be uniformly spaced all throughout the roof top.

Roof Drain Types


There are several different alternatives of roof drains. They generally fall into two groups: flat roof drains and pitched roof drains. Pitched roof rainwater drains normally consist of gutters that accumulate rainwater that travels by means of gravity to the roof edge. Gutters channel this water towards downspouts which route the water flow down and away from the structure or in to sewer lines. Flat roof drains can be one of three primary types: scuppers, inner drains or siphonic drains.

Roof Rainwater Drain Scuppes


Scuppers are situated on the roof's perimeter. They can also be installed on a balcony or terrace. Small holes are cut into the side of the roof structure so rain water can flow out and drain the roof top. Scuppers can connect to a downspout, or could be extended to make sure that water is directed away from the structure sides and foundation.

Inner Roof Drains


There are many types of inner drains for flat roofs. They are installed at low spots on the roof and connect to interior drainage pipes that route water outside or into a sewer system. Many models of inner roof drains have domes, strainers or covers which prevent trash from clogging the roof drain pipe. These types of drains operate via gravity channeling pooling water through the roof drain system. They can be constructed 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 permits both air and water to go into 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 creates a siphonic drain which removes air from the system and permits smaller pipe diameters . When all air is eliminated, a negative air pressure in the tail portion of the drain is set up which draws rainwater off the roof siphonically. Although used mainly for flat roofs, siphonic drains can also be installed on pitched roofs.

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