There are a few distinct types of roof water drains and roof drain system in Attalla, AL and each is an unique approach to the wide range of roof styles and their drainage issues. You must take into consideration the type of roof, its dimensions, and its roof pitch to be able to pick the right drain. You also should take into consideration the location of the drain, what amount of rainwater is anticipated and safety when choosing a roof drain for a home or business structure. Hip roofs, dormers, gable and mansard roofs shed water because of gravitational force. Flat roofs, conversely, accumulate rain water. Until this water is guided out and away from the flat roof , it will create pools that could eventually leak and the amassed weight will subsequently result in compromising the integrity of the structure. That is why roofs with a pitch of under 2% ought to have roof drains situated at the lowest places on the roof where water puddles and should be evenly spaced throughout the roof surface.
Kinds of Roof Drains
There are a number of different variations of roof drains. They basically fall into 2 categories: flat roof drains and pitched roof drains. Pitched roof drains normally consist of gutters that collect rainwater that passes via gravity to the roof edge. Gutters channel this water towards downspouts which route the water flow down and away from the structure or in to sewers. Flat roof drains are one of three main types: scuppers, inner drains or siphonic drains.
Roof Drain Scuppers
Scuppers are located on a roof's perimeter. They can also be put in on a balcony or terrace. Small holes are cut into the side of the roof structure so that rain water can flow out and drain the roof top. Scuppers can hook up to a downspout, or can be lengthened to make sure that water is directed 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 areas on the roof and connect to inner drainage pipes that route water outdoors or in to a sewer system. Many designs of internal roof drains have domes, strainers or covers that keep debris from clogging the roof drain pipe. These types of drains operate via gravitational force funneling 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 effective substitute for gravity drainage. Conventional 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 incorporating an engineered baffle to the sump of the drain system it creates a siphonic drain that 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 piece of the drain is established which pulls 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 system in and around Attalla, Alabama, give us a call. We'd be glad to help.