Roof Drains


There are a number of different kinds of roof drains and roof drain dome in Alabaster, AL and each one is an unique answer to the wide range of roof types and their drainage concerns. You need to look at the type of roof, its dimensions, and its roof pitch to be able to select the most suitable drain. You also should take into account the location of the drain, what amount of rainwater is expected and safety when selecting a roof water drain for a house or commercial building.

Hip roofs, dormers, gable and mansard roofs shed rainwater water because of gravity. Flat roofs, on the other hand, accumulate rain water. Unless the water is guided out and away from the flat roof , it will most likely create pools that could inevitably leak and the accumulated weight will subsequently result in structural damage. That is the reason that roofs with a slope of less than two percent should have roof drains located in the lowest areas on the roof in which water puddles and need to be uniformly spaced all throughout the roof top.

Roof Drain Kinds


There are several distinct variations of roof drains. They basically fall into 2 groups: pitched roof drains and flat roof drains. Pitched roof rainwater drains normally consist of gutters which accumulate rainwater that travels by means of gravity down to the roof periphery. Gutters direct this water in the direction of downspouts which route the water flow down and away from the building or into sewer lines. Flat roof drains can be one of three primary types: scuppers, inner drains or siphonic drains.

Roof Drain Scuppers


Scuppers are located on a roof's perimeter. Scuppers can also be put in on a balcony or terrace. Small holes are cut in the side of the roof structure so water can flow out and drain the roof surface. Scuppers can hook up to a downspout, or could be extended to make sure that water is guided 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 places in the roof and attach to interior drainage pipes that drive water outside or into a sewer system. Several versions of internal roof drains have domes, strainers or covers which keep debris from clogging the roof drain pipe. These types of drains operate via gravitational force channeling pooling water thru the roof drain system. They can be constructed from PVC, cast iron or cast aluminum.

Siphonic Roof Drains

Siphonic roof drains are a more efficient substitute for gravity drainage. Traditional flat roof drainage allows both air and water to go into the drain system producing pipe space occupied by both air and water. By adding an engineered baffle to the sump of the drain body it produces a siphonic drain that removes air from the system and allows for smaller sized pipe diameters to be used. 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 set up on pitched roofs.

If you need more information about flat roof drain or roof drain dome in and around Alabaster, Alabama, give us a call. We'd be glad to help.