There are a number of distinct varieties of roof drains and roof drain cover in Oneonta, AL and each one is a specific solution to the wide range of roof types and their drainage issues. You should look at 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 location of the drain, what amount of rainwater is expected and safe practices when selecting a roof water drain for a house or business structure. Gable, dormer, mansard and hip roofs shed rainwater water due to gravity. Flat roofs, alternatively, collect water. Until this water is directed out and away from the roof structure, it will most likely develop pools that could eventually leak and the amassed weight will eventually result in structural damage. That is the reason that roofs with a pitch of less than two percent should have roof drains located in the lowest areas on the roof in which water pools and should be evenly spaced throughout the roof top.
Roof Drain Kinds
There are several distinct alternatives of roof drains. They basically fall into two categories: flat roof drains and pitched roof drains. Pitched roof rainwater drains normally consist of gutters that accumulate rainwater which travels via gravity down to the roof edge. Gutters channel this water in the direction of downspouts which route the water flow down and away from the building or in to sewer lines. Flat roof drains are one of three primary types: scuppers, inner drains or siphonic drains.
Roof Rainwater Drain Scuppes
Scuppers are located on the roof's perimeter. They can also be installed on a balcony or terrace. Small holes are cut in the side of the roof structure so rain water can empty and drain the roof top. Scuppers can hook up to a downspout, or can be extended so that water is guided away from the structure sides and foundation.
Interior Roof Drains
There are many kinds of inner drains for flat roofs. These are installed at low places in the roof and attach to inner drainage pipes that drive water outdoors or into a sewer system. Many designs of internal roof drains have domes, strainers or covers that prevent trash from blocking the roof drain pipe. These types of drains operate via gravity funneling standing water thru the roof drain system. They are made of PVC, cast iron or cast aluminum.
Siphonic Roof DrainsSiphonic roof drains are a more efficient alternative to gravity drainage. Traditional 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 body it produces a siphonic drain which eliminates air from the system and permits smaller pipe diameters to be used. When all of the air is removed, a negative air pressure in the tail piece of the drain is set up which attracts rainwater off the roof siphonically. Although used mainly 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 cover in and around Oneonta, Alabama, give us a call. We'd be glad to help.