There are several distinct varieties of roof drains and roof drain pipe in Alabaster, AL and each one is an unique approach to the wide range of roof styles and their drainage concerns. You must take into consideration the type of roof, its dimensions, and its roof pitch to be able to choose the correct drain. You also may want to think about the site of the drain, what amount of rainwater is expected and safe practices when selecting a roof drain for a house or commercial structure. Gambrel, dormers, hip and gable roofs shed rainwater water because of gravitational force. Flat roofs, on the other hand, accumulate rain water. Until the water is directed out and away from the flat roof , it will most likely develop pools that may eventually leak and the accumulated weight will eventually result in structural damage. That is the reason that roofs with a pitch of under 2% ought to have roof drains situated at the lowest spots on the roof in which water puddles and need to be uniformly spread throughout the roof surface.
Roof Drain Types
There are a number of different variations of roof drains. They basically fall into two groups: flat roof drains and pitched roof drains. Pitched roof rainwater drains normally consist of gutters that accumulate rainwater which passes by means of gravity to the roof edge. Gutters transport this water towards downspouts which route the water flow down and away from the structure or in to sewer lines. Flat roof drains can be one of three primary types: scuppers, inner drains or siphonic drains.
Roof Rainwater Drain Scuppes
Scuppers are situated on a roof's periphery. They can also be placed on a balcony or terrace. Small openings are cut in the side of the roof structure so that water can empty and drain the roof surface. Scuppers can hook up to a downspout, or could be extended so that water is guided off of the structure sides and foundation.
Inner Roof Drains
There are quite a few different kinds of inner drains for flat roofs. They are positioned at low places on the roof and attach to interior drainage pipes that drive water outdoors or into a sewer system. Many styles of internal roof drains have domes, strainers or covers that prevent debris from clogging the roof drain pipe. These kinds 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 alternative to gravity drainage. Standard flat roof drainage permits both air and water to enter the drain system producing pipe space which is occupied by both air and water. By incorporating an engineered baffle to the sump of the drain body it creates a siphonic drain which eliminates air from the system and allows for smaller sized pipe diameters to be used. When all air is removed, a negative air pressure in the tail piece of the drain is set up which attracts water 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 roof drain pipe in and around Alabaster, Alabama, give us a call. We'd be glad to help.