Roof Drains


There are several different varieties of roof drains and roof drain dome in Montgomery, AL and each is a specific approach to the wide range of roof styles and their drainage challenges. You need to take into consideration the kind of roof, its size, and its roof pitch to be able to select the most suitable drain. You also need to take into consideration the site of the drain, what amount of rainwater is anticipated and safety when choosing a roof water drain for a residence or business building.

Gambrel, dormers, hip and gable roofs shed rainwater 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 create pools that could eventually leak and the accumulated weight will eventually result in structural damage. That is the reason that roofs with a slope of less than two percent ought to have roof drains located in the lowest areas on the roof in which water pools and should be uniformly spread throughout the roof top.

Roof Drain Kinds


There are a number of distinct alternatives of roof drains. They basically fall into two groups: flat roof drains and pitched roof drains. Pitched roof drains usually comprise gutters which accumulate rainwater which travels via gravity to the roof edge. Gutters direct this water towards downspouts which direct the water flow down and away from the structure or in to sewer lines. Flat roof drains can be one of three main types: scuppers, inner drains or siphonic drains.

Roof Rainwater Drain Scuppes


Scuppers are located on the roof's perimeter. They can also be put in 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 surface. Scuppers can attach to a downspout, or can be extended so that water is directed off of the structure sides and foundation.

Interior Roof Drains


There are many types of inner drains for flat roofs. These are installed at low places in the roof and connect to interior drainage pipes that route water outside or into a sewer system. Several designs of internal roof drains have domes, strainers or covers that keep debris from blocking the roof drain pipe. These types of drains work via gravity channeling standing water through 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 substitute for gravity drainage. Traditional flat roof drainage permits both air and water to go into the drain system producing pipe space occupied by both air and water. By incorporating an engineered baffle to the sump of the drain body it creates a siphonic drain that removes air from the system and permits smaller pipe diameters . When all of the air is eliminated, a negative air pressure in the tail piece of the drain is established which pulls rainwater off the roof siphonically. Though 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 dome in and around Montgomery, Alabama, give us a call. We'd be glad to help.