Roof Drains


At this time there are several distinct types of roof water drains and roof drain cover in Harvest, AL and each is an unique approach to the variety of roof styles and their drainage concerns. You should think about the type of roof, its dimensions, and the roof pitch to be able to select the right drain. You also may want to take into account the site of the drain, what amount of rainwater is anticipated and safety when selecting a roof water drain for a house or commercial structure.

Hip roofs, dormers, gable and mansard roofs shed water because of gravity. Flat roofs, on the other hand, collect rain water. Until this water is guided out and away from the roof structure, it will most likely develop pools that may eventually leak and the accumulated weight may eventually result in structural damage. That is why roofs with a slope of below 2% should have roof drains situated in the lowest spots on the roof in which water puddles and need to be uniformly spaced throughout the roof top.

Types of Roof Drains


There are a number of different alternatives of roof drains. They basically fall into two groups: pitched roof drains and flat roof drains. Pitched roof rainwater drains usually consist of gutters which accumulate rainwater that passes by means of gravity down to the roof periphery. Gutters channel this water towards downspouts which steer the water flow down and 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 Rainwater Drain Scuppes


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 that rain water can empty and drain the roof top. Scuppers can hook up to a downspout, or can be extended so that water is directed off of the building sides and foundation.

Inner Roof Drains


There are many types of inner drains for flat roofs. They are installed at low places on the roof and connect to interior drainage pipes that route water outside or into a sewer system. Several versions of internal roof drains have domes, strainers or covers which prevent trash from clogging the roof drain pipe. These types of drains work via gravity funneling 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 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 body it creates a siphonic drain that removes air from the system and permits smaller pipe diameters . When all air is eliminated, a negative air pressure in the tail piece of the drain is established which attracts rainwater off the roof siphonically. Though 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 cover in and around Harvest, Alabama, give us a call. We'd be glad to help.