Roof Drains


At this time there are a number of distinct kinds of roof drains and roof drain cover in Madison, AL and each one is a specific approach to the wide range of roof styles and their drainage concerns. You need to consider the kind of roof, its dimensions, and its roof pitch to be able to select the most suitable drain. You also may want to take into account the location of the drain, how much rainwater is anticipated and safety when choosing a roof drain for a home or commercial building.

Gambrel, dormers, hip and gable roofs shed water thanks to gravity. Flat roofs, conversely, collect water. Until this water is guided out and away from the roof structure, it will develop pools that may inevitably leak and the amassed weight will subsequently cause compromising the integrity of the structure. That is the reason that roofs with a pitch of below two percent should have roof drains located at the lowest places on the roof where water pools and need to be uniformly spread throughout the roof top.

Kinds of Roof Drains


There are a number of different variations of roof drains. They generally fall into two categories: pitched roof drains and flat roof drains. Pitched roof rainwater drains usually comprise gutters which accumulate rainwater that passes by means of gravity down to the roof periphery. Gutters direct this water towards downspouts which steer the water flow down and away from the structure or into sewers. 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. They can also be placed on a balcony or terrace. Small holes are cut in the side of the roof structure so that rain water can empty and drain the roof top. Scuppers can hook up to a downspout, or could be lengthened to make sure that water is directed away from the building sides and foundation.

Inner Roof Drains


There are quite a few different types of inner drains for flat roofs. They are installed at low spots on the roof and attach to interior drainage pipes that route water outdoors or into a sewer system. Several designs of internal roof drains have domes, strainers or covers that prevent trash from blocking the roof drain pipe. These kinds of drains work via gravity funneling pooling water thru the roof drain system. They are made from PVC, cast iron or cast aluminum.

Siphonic Roof Drains

Siphonic roof drains are a more effective alternative to gravity drainage. Traditional flat roof drainage permits both air and water to enter the drain system creating pipe space occupied by both air and water. By incorporating an engineered baffle to the sump of the drain body it produces a siphonic drain that eliminates air from the system and permits smaller pipe diameters to be used. When all air is removed, a negative air pressure in the tail portion of the drain is set up which pulls water off the roof siphonically. Although 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 Madison, Alabama, give us a call. We'd be glad to help.