At this time there are a few different kinds of roof drains and cast iron roof drain in Oxford, AL and each is an unique approach to the variety of roof styles and their drainage challenges. You must take into consideration the type of roof, its size, and the roof pitch to be able to pick the right drain. You also need to take into account the location of the drain, how much rainwater is anticipated and safe practices when selecting a roof drain for a residence or commercial building. Gambrel, dormers, hip and gable roofs shed water due to gravity. Flat roofs, on the other hand, accumulate rain water. Until this water is routed out and away from the roof structure, it will create pools of water that may inevitably leak and the accumulated weight may eventually result in structural damage. That is why roofs with a pitch of under two percent ought to have roof drains located in the lowest areas on the roof where water pools and need to be uniformly spaced throughout the roof top.
Roof Drain Types
There are several distinct alternatives of roof drains. They basically fall into two groups: pitched roof drains and flat roof drains. Pitched roof drains usually comprise gutters which collect rainwater which passes by means of gravity to the roof edge. Gutters direct this water in the direction of downspouts which direct the water flow down and away from the structure or into sewers. Flat roof drains can be one of three primary types: scuppers, inner drains or siphonic drains.
Roof Drain Scuppers
Scuppers are located on the roof's periphery. 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 empty and drain the roof top. Scuppers can hook up to a downspout, or can be extended to make sure that water is directed off of the building sides and foundation.
Inner Roof Drains
There are quite a few different types of inner drains for flat roofs. They are installed at low places on the roof and connect to interior drainage pipes that direct water outside or in to a sewer system. Many models of internal roof drains have domes, strainers or covers which prevent trash from blocking the roof drain pipe. These types of drains operate via gravitational force channeling pooling water through the roof drain system. They can be made from PVC, cast iron or cast aluminum.
Siphonic Roof DrainsSiphonic roof drains are a more effective substitute for gravity drainage. Conventional flat roof drainage allows both air and water to go into the drain system producing pipe space occupied by both air and water. By adding an engineered baffle to the sump of the drain body it produces a siphonic drain that removes air from the system and permits smaller sized pipe diameters . When all air is removed, 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 cast iron roof drain in and around Oxford, Alabama, give us a call. We'd be glad to help.