Roof Drains


At this time there are a few different types of roof water drains and roof drain pvc in Madison, AL and each is a specific answer to the wide range of roof types and their drainage issues. You should look at the type of roof, its dimensions, and its roof pitch to be able to choose the most suitable drain. You also should think about the site of the drain, what amount of rainwater is expected and safe practices when selecting a roof water drain for a home or commercial structure.

Gable, dormer, mansard and hip roofs shed water thanks to gravitational force. Flat roofs, alternatively, accumulate water. Until this water is guided out and away from the flat roof structure, it will create pools that could eventually leak and the accumulated weight may eventually result in structural damage. That is the reason that roofs with a slope of below 2% ought to have roof drains located at the lowest places on the roof in which water puddles and should be evenly spaced all throughout the roof surface.

Roof Drain Types


There are several different alternatives of roof drains. They basically fall into two categories: flat roof drains and pitched roof drains. Pitched roof drains usually consist of gutters which collect rainwater which passes by means of gravity to the roof edge. Gutters transport this water in the direction of downspouts which route the water flow down and away from the building or into sewers. Flat roof drains are one of three primary types: scuppers, inner drains or siphonic drains.

Roof Drain Scuppers


Scuppers are situated on a roof's periphery. Scuppers can also be put in on a balcony or terrace. Small openings are cut in the side of the roof structure so water can empty and drain the roof top. Scuppers can connect to a downspout, or can be extended so that water is guided off of the building sides and foundation.

Interior Roof Drains


There are many kinds of inner drains for flat roofs. They are positioned at low places on the roof and connect to interior drainage pipes that drive water outdoors or into a sewer system. Many models of internal roof drains have domes, strainers or covers that prevent debris from obstructing the roof drain pipe. These types of drains work via gravity channeling pooling water thru the roof drain system. They are constructed from PVC, cast iron or cast aluminum.

Siphonic Roof Drains

Siphonic roof drains are a more efficient alternative to gravity drainage. Standard flat roof drainage permits both air and water to enter the drain system creating pipe space which is occupied by both air and water. By adding an engineered baffle to the sump of the drain body it creates a siphonic drain which removes air from the system and allows for smaller pipe diameters . When all air is removed, a negative air pressure in the tail portion of the drain is established which attracts rainwater off the roof siphonically. Though used primarily for flat roofs, siphonic drains can also be installed on pitched roofs.

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