There are a few different kinds of roof drains and roof drain pan in Opelika, AL and each is an unique approach to the variety 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 select the correct drain. You also may want to take into consideration the location of the drain, how much rainwater is expected and safe practices when selecting a roof drain for a house or commercial structure. Hip roofs, dormers, gable and mansard roofs shed rainwater water because of gravity. Flat roofs, on the other hand, collect rain water. Unless the water is routed out and away from the flat roof , it will most likely create pools that could inevitably leak and the amassed weight will subsequently cause structural damage. That is why roofs with a slope of less than two percent ought to have roof drains located in the lowest spots on the roof in which water puddles and need to be evenly spaced throughout the roof surface.
Roof Drain Kinds
There are several distinct variations of roof drains. They generally fall into 2 groups: pitched roof drains and flat roof drains. Pitched roof rainwater drains normally consist of gutters which collect rainwater which passes via gravity to the roof periphery. Gutters channel this water in the direction of downspouts which steer the water flow down and far away from the building or into sewers. Flat roof drains are one of three main types: scuppers, inner drains or siphonic drains.
Roof Drain Scuppers
Scuppers are located on the roof's perimeter. They can also be installed on a balcony or terrace. Small openings are cut into the side of the roof structure so water can flow out and drain the roof surface. Scuppers can connect to a downspout, or could be extended so that water is directed off of the building sides and foundation.
Inner Roof Drains
There are quite a few different kinds of inner drains for flat roofs. They are installed at low spots in the roof and connect to inner drainage pipes that direct water outside or in to a sewer system. Many versions of internal roof drains have domes, strainers or covers that prevent trash from clogging the roof drain pipe. These types of drains work via gravity channeling standing water thru the roof drain system. They can be made of PVC, cast iron or cast aluminum.
Siphonic Roof DrainsSiphonic roof drains are a more effective substitute for gravity drainage. Standard flat roof drainage permits both air and water to go into the drain system creating pipe space occupied by both air and water. By incorporating an engineered baffle to the sump of the drain system it produces a siphonic drain which removes air from the system and allows for smaller sized pipe diameters to be used. When all of the air is eliminated, a negative air pressure in the tail portion of the drain is established which attracts water off the roof siphonically. Though used mainly for flat roofs, siphonic drains can also be set up on pitched roofs.
If you need more information about flat roof drain or roof drain pan in and around Opelika, Alabama, give us a call. We'd be glad to help.