At this time there are a few distinct types of roof water drains and roof drain system in Gadsden, AL and each one is an unique approach to the variety of roof types and their drainage concerns. You need to take into consideration 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 account the location of the drain, how much rainwater is expected and safe practices when choosing a roof drain for a residence or commercial building. Hip roofs, dormers, gable and mansard roofs shed rainwater water thanks to gravitational force. Flat roofs, conversely, collect water. Unless this water is directed out and away from the flat roof structure, it will create pools that may eventually leak and the accumulated weight may subsequently result in structural damage. That is why roofs with a pitch of less than two percent ought to have roof drains situated at the lowest places on the roof where water pools and should be uniformly spread throughout the roof top.
Roof Drain Types
There are a number of distinct alternatives of roof drains. They basically fall into 2 groups: pitched roof drains and flat roof drains. Pitched roof rainwater drains normally consist of gutters that accumulate rainwater that travels by means of gravity to the roof periphery. Gutters direct this water in the direction of downspouts which route the water flow down and far away from the building or in to sewers. Flat roof drains are one of three main types: scuppers, inner drains or siphonic drains.
Roof Rainwater Drain Scuppes
Scuppers are located on a roof's periphery. Scuppers can also be installed on a balcony or terrace. Small holes are cut in the side of the roof structure so rain water can empty and drain the roof surface. Scuppers can attach to a downspout, or could be extended so that water is directed off of the structure sides and foundation.
Inner Roof Drains
There are quite a few different kinds of inner drains for flat roofs. These are positioned at low areas on the roof and attach to interior drainage pipes that route water outside or into a sewer system. Many styles of internal roof drains have domes, strainers or covers which keep debris from obstructing the roof drain pipe. These types of drains work via gravitational force channeling pooling water thru the roof drain system. They are made from PVC, cast iron or cast aluminum.
Siphonic Roof DrainsSiphonic roof drains are a more effective alternative to gravity drainage. Conventional flat roof drainage allows both air and water to enter 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 which removes air from the system and allows for smaller pipe diameters . When all air is eliminated, a negative air pressure in the tail piece of the drain is established which pulls water off the roof siphonically. Although used mainly for flat roofs, siphonic drains can also be installed on pitched roofs.
If you need more information about flat roof drain or roof drain system in and around Gadsden, Alabama, give us a call. We'd be glad to help.