Roof Drains


At this time there are a few distinct varieties of roof drains and roof drain cover in Attalla, AL and each is an unique answer to the wide range of roof types and their drainage issues. You need to consider the type of roof, its dimensions, and the roof pitch to be able to select the right drain. You also may want to take into consideration the site of the drain, what amount of rainwater is expected and safe practices when selecting a roof water drain for a house or business building.

Gambrel, dormers, hip and gable roofs shed rainwater water because of gravitational force. Flat roofs, on the other hand, collect water. Until the water is routed out and away from the roof , it will most likely develop pools that may inevitably leak and the accumulated weight may eventually cause compromising the integrity of the structure. That is the reason that roofs with a pitch of below two percent ought to have roof drains positioned at the lowest areas on the roof in which water pools and should be evenly spread all throughout the roof top.

Roof Drain Types


There are a number of distinct variations of roof drains. They generally fall into two categories: pitched roof drains and flat roof drains. Pitched roof rainwater drains usually consist of gutters which collect rainwater which travels by means of gravity down to the roof periphery. Gutters direct this water in the direction of downspouts which direct the water flow down and far away from the building or in to sewers. Flat roof drains can be one of three main types: scuppers, inner drains or siphonic drains.

Roof Rainwater Drain Scuppes


Scuppers are located on a roof's perimeter. They can also be installed on a balcony or terrace. Small holes are cut in the side of the roof structure so that water can flow out and drain the roof surface. Scuppers can attach to a downspout, or could be extended to make sure that water is guided off of the building sides and foundation.

Inner Roof Drains


There are many kinds of inner drains for flat roofs. They are positioned at low spots in the roof and attach to inner drainage pipes that direct water outdoors or in to a sewer system. Many models of inner roof drains have domes, strainers or covers that keep trash from blocking the roof drain pipe. These types of drains work via gravitational force channeling pooling water thru the roof drain system. They can be made of PVC, cast iron or cast aluminum.

Siphonic Roof Drains

Siphonic roof drains are a more effective alternative to gravity drainage. Standard flat roof drainage permits both air and water to enter 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 pipe diameters . When all air is eliminated, a negative air pressure in the tail portion of the drain is set up which draws rainwater 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 cover in and around Attalla, Alabama, give us a call. We'd be glad to help.