There are a few different types of roof water drains and roof drain pan in Decatur, AL and each one is a specific answer to the wide range of roof styles and their drainage issues. You should think about the kind of roof, its dimensions, and the roof pitch to be able to select the most suitable drain. You also may want to think about the location of the drain, how much rainwater is expected and safety when choosing a roof water drain for a home or commercial structure. Gable, dormer, mansard and hip roofs shed rainwater water because of gravity. Flat roofs, alternatively, accumulate water. Until the water is routed out and away from the flat roof structure, it will most likely create pools of water that may inevitably leak and the amassed weight will subsequently result in structural damage. That is the reason that roofs with a pitch of less than two percent ought to have roof drains located at the lowest spots on the roof where water pools and need to be uniformly spaced all throughout the roof surface.
Roof Drain Kinds
There are several distinct variations of roof drains. They basically fall into two groups: flat roof drains and pitched roof drains. Pitched roof drains usually consist of gutters that collect rainwater which travels via gravity down to the roof edge. Gutters transport this water in the direction of downspouts which direct the water flow down and away from the building or into sewers. Flat roof drains are one of three primary types: scuppers, inner drains or siphonic drains.
Roof Drain Scuppers
Scuppers are located on a roof's perimeter. Scuppers can also be placed on a balcony or terrace. Small openings are cut in the side of the roof structure so rain water can flow out and drain the roof surface. Scuppers can attach to a downspout, or can be extended so that water is directed off of the building sides and foundation.
Interior Roof Drains
There are many kinds of inner drains for flat roofs. These are positioned at low areas in the roof and connect to interior drainage pipes that route water outdoors or in to a sewer system. Many versions of inner roof drains have domes, strainers or covers which prevent trash from clogging the roof drain pipe. These kinds of drains work via gravity channeling standing water thru the roof drain system. They can be constructed from PVC, cast iron or cast aluminum.
Siphonic Roof DrainsSiphonic roof drains are a more efficient substitute for gravity drainage. Standard flat roof drainage allows both air and water to go into the drain system producing pipe space occupied by both air and water. By incorporating an engineered baffle to the sump of the drain body it creates a siphonic drain that eliminates air from the system and permits smaller pipe diameters . When all air is eliminated, a negative air pressure in the tail piece of the drain is established which draws water 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 roof drain pan in and around Decatur, Alabama, give us a call. We'd be glad to help.