Roof Drains


At this time there are a number of different varieties of roof water drains and roof drain dome in Mobile, AL and each is a specific solution to the wide range of roof types and their drainage concerns. You should consider the type of roof, its dimensions, and its roof pitch to be able to pick the correct drain. You also need to take into consideration the site of the drain, what amount of rainwater is expected and safe practices when choosing a roof water drain for a home or commercial building.

Gambrel, dormers, hip and gable roofs shed rainwater water thanks to gravity. Flat roofs, alternatively, accumulate water. Until the water is directed out and away from the flat roof structure, it will develop pools of water that may eventually leak and the accumulated weight may eventually result in damage to the structure. That is the reason that roofs with a slope of below 2% ought to have roof drains located at the lowest spots on the roof where water pools and need to be evenly spaced throughout the roof surface.

Types of Roof Drains


There are several distinct variations of roof drains. They generally fall into two categories: flat roof drains and pitched roof drains. Pitched roof drains usually consist of gutters that collect rainwater that passes by means of gravity down to the roof edge. Gutters direct this water towards downspouts which steer the water flow down and away from the structure 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 situated on a roof's periphery. They can also be installed on a balcony or terrace. Small openings 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 to make sure that water is directed off of the structure sides and foundation.

Interior Roof Drains


There are quite a few different types of inner drains for flat roofs. These are installed at low areas in the roof and connect to interior drainage pipes that route water outside or in to a sewer system. Many styles of inner roof drains have domes, strainers or covers which prevent debris from clogging the roof drain pipe. These kinds of drains work via gravity funneling standing 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. 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 body it produces a siphonic drain that removes air from the system and permits smaller sized pipe diameters to be used. When all air is removed, a negative air pressure in the tail piece of the drain is set up which pulls rainwater off the roof siphonically. Though used mainly 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 dome in and around Mobile, Alabama, give us a call. We'd be glad to help.