There are several different kinds of roof drains and cast iron roof drain in Bessemer, AL and each one is a specific answer to the wide range of roof types and their drainage challenges. You should look at the type of roof, its dimensions, and the roof pitch to be able to choose the right drain. You also need to take into consideration the location of the drain, how much rainwater is expected and safe practices when choosing a roof water drain for a home or commercial structure. Gable, dormer, mansard and hip roofs shed water due to gravitational force. Flat roofs, conversely, collect rain water. Until this water is guided out and away from the roof structure, it will develop pools that could inevitably leak and the amassed weight may eventually cause compromising the integrity of the structure. That is the reason that roofs with a pitch of below 2% ought to have roof drains situated in the lowest places on the roof where water pools and need to be uniformly spread throughout the roof top.
Types of Roof Drains
There are several different variations of roof drains. They basically fall into two categories: pitched roof drains and flat roof drains. Pitched roof rainwater drains normally consist of gutters that collect rainwater which travels by means of gravity to the roof periphery. Gutters channel this water towards downspouts which steer the water flow down and away from the building or into sewer lines. Flat roof drains can be one of three primary types: scuppers, inner drains or siphonic drains.
Roof Drain Scuppers
Scuppers are situated on the roof's perimeter. Scuppers can also be installed on a balcony or terrace. Small openings 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 can be extended to make sure that water is directed away from the structure sides and foundation.
Interior Roof Drains
There are quite a few different types of inner drains for flat roofs. They are positioned at low areas in the roof and attach to inner drainage pipes that drive water outside or into a sewer system. Many versions of inner roof drains have domes, strainers or covers which keep trash from obstructing the roof drain pipe. These types of drains work via gravity funneling standing water thru the roof drain system. They are constructed from PVC, cast iron or cast aluminum.
Siphonic Roof DrainsSiphonic roof drains are a more effective alternative to gravity drainage. Standard flat roof drainage allows both air and water to enter the drain system producing pipe space 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 permits smaller pipe diameters . When all air is removed, a negative air pressure in the tail portion of the drain is established which pulls 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 cast iron roof drain in and around Bessemer, Alabama, give us a call. We'd be glad to help.