Roof Drains


There are a number of distinct types of roof water drains and roof drain cover in Alabaster, AL and each one is a specific solution to the wide range of roof types and their drainage challenges. You need to look at the type of roof, its dimensions, and its roof pitch to be able to pick the right drain. You also should take into consideration the location of the drain, what amount of rainwater is expected and safe practices when selecting a roof water drain for a house or commercial building.

Gambrel, dormers, hip and gable roofs shed water because of gravity. Flat roofs, alternatively, accumulate rain water. Until this water is directed out and away from the roof , it will most likely create pools of water that could eventually leak and the amassed weight may eventually cause damage to the structure. That is why roofs with a slope of less than 2% should have roof drains positioned in the lowest areas on the roof in which water pools and need to be uniformly spread all throughout the roof top.

Roof Drain Kinds


There are a number of different variations 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 via gravity to the roof periphery. Gutters transport this water in the direction of downspouts which direct the water flow down and far away from the structure 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 situated on a roof's periphery. They can also be installed on a balcony or terrace. Small holes are cut in the side of the roof structure so that rain water can empty and drain the roof surface. Scuppers can connect to a downspout, or can be lengthened to make sure that water is guided away from the building sides and foundation.

Interior Roof Drains


There are quite a few different kinds of inner drains for flat roofs. These are installed at low places in the roof and attach to inner drainage pipes that route water outdoors or into a sewer system. Several models of internal roof drains have domes, strainers or covers which prevent debris from obstructing the roof drain pipe. These types of drains operate via gravity channeling standing water thru the roof drain system. They can be made of PVC, cast iron or cast aluminum.

Siphonic Roof Drains

Siphonic roof drains are a more efficient substitute for gravity drainage. Standard flat roof drainage allows both air and water to go into 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 produces a siphonic drain which removes air from the system and allows for smaller pipe diameters to be used. When all air is eliminated, a negative air pressure in the tail piece of the drain is established which pulls water off the roof siphonically. Although used mainly for flat roofs, siphonic drains can also be installed on angled roofs.

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