Roof Drains


There are a number of distinct types of roof drains and roof drain dome in Killen, AL and each one is a specific answer to the wide range of roof types and their drainage issues. You should consider the type of roof, its dimensions, and the roof pitch to be able to pick the right drain. You also should think about the location of the drain, how much rainwater is anticipated and safe practices when choosing a roof drain for a house or commercial building.

Hip roofs, dormers, gable and mansard roofs shed rainwater water thanks to gravity. Flat roofs, on the other hand, accumulate rain water. Until the water is guided out and away from the roof , it will most likely create pools that may eventually leak and the accumulated weight will eventually result in structural damage. That is why roofs with a pitch of less than two percent should have roof drains positioned at the lowest places on the roof in which water puddles and should be evenly spaced throughout the roof surface.

Roof Drain Kinds


There are a number of different variations of roof drains. They generally fall into two groups: pitched roof drains and flat roof drains. Pitched roof rainwater drains normally consist of gutters that collect rainwater that passes via gravity down to the roof edge. Gutters channel this water towards downspouts which direct the water flow down and far away from the building or in to sewers. Flat roof drains can be one of three main 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 holes are cut into the side of the roof structure so water can empty and drain the roof top. Scuppers can hook up to a downspout, or could be extended so that water is guided off of the structure sides and foundation.

Inner Roof Drains


There are quite a few different kinds of inner drains for flat roofs. These are installed at low places on the roof and connect to inner drainage pipes that route water outside or into a sewer system. Several styles of internal roof drains have domes, strainers or covers which keep debris from clogging the roof drain pipe. These kinds of drains work via gravity channeling pooling 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. Standard flat roof drainage allows 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 system it creates a siphonic drain that removes air from the system and allows for smaller sized pipe diameters to be used. When all of the air is removed, a negative air pressure in the tail piece of the drain is established which draws water 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 Killen, Alabama, give us a call. We'd be glad to help.