Roof Drains


There are a few distinct varieties of roof drains and roof drain cover in Decatur, AL and each one is an unique answer to the wide range of roof styles and their drainage issues. You must consider the kind of roof, its dimensions, and the roof pitch to be able to select the most suitable drain. You also may want to take into account the site of the drain, what amount of rainwater is anticipated and safety when choosing a roof drain for a house or business building.

Hip roofs, dormers, gable and mansard roofs shed rainwater water due to gravity. Flat roofs, conversely, accumulate water. Until this water is routed out and away from the flat roof , it will develop pools that may eventually leak and the amassed weight may subsequently result in compromising the integrity of the structure. That is the reason that roofs with a slope of below 2% should have roof drains located at the lowest spots on the roof where water pools and need to be uniformly spaced all throughout the roof surface.

Roof Drain Types


There are a number of different alternatives of roof drains. They basically fall into two categories: pitched roof drains and flat roof drains. Pitched roof rainwater drains usually comprise gutters which collect rainwater which passes via gravity to the roof edge. Gutters channel this water towards downspouts which route the water flow down and far away from the building or in to sewer lines. Flat roof drains are one of three primary types: scuppers, inner drains or siphonic drains.

Roof Rainwater Drain Scuppes


Scuppers are situated on the roof's periphery. They can also be put in on a balcony or terrace. Small openings are cut into the side of the roof structure so rain water can flow out and drain the roof top. 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 many types of inner drains for flat roofs. They are installed at low places in the roof and connect to inner drainage pipes that route water outdoors or into a sewer system. Many designs of internal roof drains have domes, strainers or covers that prevent trash from blocking the roof drain pipe. These types of drains operate via gravitational force funneling standing water through the roof drain system. They are made from PVC, cast iron or cast aluminum.

Siphonic Roof Drains

Siphonic roof drains are a more efficient alternative to gravity drainage. Traditional flat roof drainage allows both air and water to go into the drain system creating 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 eliminates air from the system and permits smaller sized pipe diameters . When all air is removed, a negative air pressure in the tail piece of the drain is established which attracts rainwater off the roof siphonically. Although used primarily for flat roofs, siphonic drains can also be set up on pitched roofs.

If you need more information about flat roof drain or roof drain cover in and around Decatur, Alabama, give us a call. We'd be glad to help.