At this time there are a number of different kinds of roof drains and roof drain cover in Athens, AL and each one is a specific solution to the wide range of roof styles and their drainage issues. You should think about 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 location of the drain, what amount of rainwater is expected and safe practices when selecting a roof drain for a residence or commercial structure. Hip roofs, dormers, gable and mansard roofs shed water due to gravitational force. Flat roofs, alternatively, accumulate water. Until this water is routed out and away from the flat roof structure, it will develop pools that could inevitably leak and the accumulated weight may subsequently result in compromising the integrity of the structure. That is the reason that roofs with a pitch of below 2% ought to have roof drains positioned at the lowest areas on the roof where water puddles and need to be evenly spaced all throughout the roof top.
Roof Drain Types
There are several distinct variations of roof drains. They generally fall into two groups: pitched roof drains and flat roof drains. Pitched roof drains usually consist of gutters which collect rainwater which travels by means of gravity down to the roof edge. Gutters transport this water towards downspouts which direct the water flow down and far away from the structure or into sewer lines. Flat roof drains can be one of three main types: scuppers, inner drains or siphonic drains.
Roof Rainwater Drain Scuppes
Scuppers are situated on a roof's perimeter. Scuppers can also be put in on a balcony or terrace. Small openings are cut into the side of the roof structure so that rain water can flow out and drain the roof top. Scuppers can connect to a downspout, or can be lengthened so that water is directed off of the structure sides and foundation.
Inner Roof Drains
There are many types of inner drains for flat roofs. They are installed at low areas in the roof and connect to inner drainage pipes that route water outdoors or in to 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 gravitational force channeling standing water thru the roof drain system. They are made from PVC, cast iron or cast aluminum.
Siphonic Roof DrainsSiphonic roof drains are a more efficient alternative to gravity drainage. Standard 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 incorporating an engineered baffle to the sump of the drain system it creates a siphonic drain that eliminates air from the system and allows for smaller sized pipe diameters to be used. When all air is eliminated, a negative air pressure in the tail portion of the drain is established which pulls rainwater off the roof siphonically. Though used primarily for flat roofs, siphonic drains can also be installed on angled roofs.
If you need more information about flat roof drain or roof drain cover in and around Athens, Alabama, give us a call. We'd be glad to help.