At this time there are a number of distinct types of roof drains and roof drain downspout in Decatur, AL and each one is a specific approach to the variety of roof types and their drainage issues. You need to consider the kind of roof, its dimensions, and the roof pitch to be able to select the correct drain. You also should take into account the site of the drain, what amount of rainwater is expected and safe practices when selecting a roof drain for a house or business building. Gambrel, dormers, hip and gable roofs shed rainwater water thanks to gravitational force. Flat roofs, on the other hand, collect rain water. Unless this water is guided out and away from the roof , it will develop pools of water that could inevitably leak and the amassed weight will eventually cause damage to the structure. That is why roofs with a slope of below two percent ought to have roof drains positioned in the lowest places on the roof in which water puddles and should be evenly spaced all throughout the roof top.
Roof Drain Types
There are a number of different alternatives of roof drains. They generally fall into two categories: flat roof drains and pitched roof drains. Pitched roof rainwater drains usually consist of gutters which accumulate rainwater that passes via gravity down to the roof periphery. Gutters channel this water towards downspouts which steer the water flow down and far away from the structure or in to sewer lines. Flat roof drains are one of three main types: scuppers, inner drains or siphonic drains.
Roof Drain Scuppers
Scuppers are situated on the roof's perimeter. They can also be placed on a balcony or terrace. Small holes are cut into the side of the roof structure so that water can empty and drain the roof surface. Scuppers can connect to a downspout, or can be lengthened so that water is directed away from the structure sides and foundation.
Interior Roof Drains
There are quite a few different types of inner drains for flat roofs. They are positioned at low spots in the roof and connect to inner drainage pipes that direct water outside or into a sewer system. Many designs of inner roof drains have domes, strainers or covers that keep debris from clogging the roof drain pipe. These types of drains operate via gravity channeling pooling water thru the roof drain system. They can be made from PVC, cast iron or cast aluminum.
Siphonic Roof DrainsSiphonic roof drains are a more effective alternative to gravity drainage. Traditional flat roof drainage allows both air and water to enter the drain system producing pipe space which is occupied by both air and water. By adding 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 removed, a negative air pressure in the tail piece of the drain is established which attracts rainwater 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 downspout in and around Decatur, Alabama, give us a call. We'd be glad to help.