Roof Drains


At this time there are a number of different varieties of roof drains and roof drain pipe in Decatur, AL and each one is an unique solution to the wide range of roof types and their drainage challenges. You should look at the kind of roof, its size, and its roof pitch to be able to select the correct drain. You also need to take into account the location of the drain, how much rainwater is expected and safety when choosing a roof water drain for a residence or commercial building.

Hip roofs, dormers, gable and mansard roofs shed rainwater water due to gravity. Flat roofs, alternatively, collect water. Until this water is guided out and away from the flat roof , it will create pools that could eventually leak and the amassed weight may eventually result in damage to the structure. That is why roofs with a slope of less than 2% should have roof drains situated in the lowest places on the roof where water puddles and should be uniformly spaced all throughout the roof surface.

Kinds of Roof Drains


There are a number of different variations of roof drains. They generally fall into 2 categories: pitched roof drains and flat roof drains. Pitched roof drains normally comprise gutters that accumulate rainwater that passes via gravity to the roof edge. Gutters direct this water in the direction of downspouts which route the water flow down and far away from the building or in to sewers. Flat roof drains can be one of three primary types: scuppers, inner drains or siphonic drains.

Roof Drain Scuppers


Scuppers are situated on the roof's periphery. 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 flow out and drain the roof surface. Scuppers can attach to a downspout, or can be extended so that water is directed away from the structure sides and foundation.

Interior Roof Drains


There are many types of inner drains for flat roofs. These are installed at low spots on the roof and connect to interior drainage pipes that drive water outdoors or into a sewer system. Several designs of internal roof drains have domes, strainers or covers that keep debris from clogging the roof drain pipe. These kinds of drains operate via gravitational force channeling standing water through the roof drain system. They are constructed from 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 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 pipe diameters to be used. When all air is removed, a negative air pressure in the tail portion of the drain is set up which attracts water off the roof siphonically. Though used primarily for flat roofs, siphonic drains can also be installed on angled roofs.

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