Roof Drains


There are a few different types of roof water drains and roof drain cover in Montgomery, AL and each is an unique solution to the wide range of roof types and their drainage issues. You must take into consideration the type of roof, its size, and its roof pitch to be able to select the correct drain. You also should think about the location of the drain, how much rainwater is expected and safety when choosing a roof water drain for a residence or commercial structure.

Gambrel, dormers, hip and gable roofs shed water because of gravitational force. Flat roofs, conversely, collect rain water. Unless this water is directed out and away from the roof structure, it will most likely develop pools that may eventually leak and the amassed weight will eventually result in structural damage. That is the reason that roofs with a pitch of below 2% ought to have roof drains situated in the lowest areas on the roof where water puddles and should be uniformly spread throughout the roof top.

Roof Drain Kinds


There are a number of different alternatives of roof drains. They basically fall into two groups: pitched roof drains and flat roof drains. Pitched roof drains usually comprise gutters that collect rainwater that passes via gravity to the roof edge. Gutters transport this water in the direction of downspouts which steer the water flow down and far away from the structure or in to sewers. Flat roof drains are one of three primary types: scuppers, inner drains or siphonic drains.

Roof Drain Scuppers


Scuppers are located on a roof's perimeter. They can also be installed on a balcony or terrace. Small openings are cut into the side of the roof structure so that rain water can empty and drain the roof top. Scuppers can connect to a downspout, or can be lengthened so that water is guided away from the structure sides and foundation.

Interior Roof Drains


There are quite a few different kinds of inner drains for flat roofs. They are positioned at low spots in the roof and connect to interior drainage pipes that route water outside or in to a sewer system. Many versions of internal roof drains have domes, strainers or covers which keep debris from obstructing the roof drain pipe. These types of drains operate via gravitational force channeling pooling water through the roof drain system. They are made of PVC, cast iron or cast aluminum.

Siphonic Roof Drains

Siphonic 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 adding an engineered baffle to the sump of the drain body it produces a siphonic drain which removes air from the system and permits smaller sized pipe diameters . When all of the air is removed, a negative air pressure in the tail portion of the drain is set up which pulls 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 Montgomery, Alabama, give us a call. We'd be glad to help.