Roof Drains


There are a few distinct kinds of roof drains and roof drain dome in Moulton, AL and each is a specific approach to the wide range of roof types and their drainage issues. You must look at the kind of roof, its size, and its roof pitch to be able to choose the correct drain. You also need to take into account the location of the drain, what amount of rainwater is expected and safe practices when selecting a roof water drain for a home or commercial building.

Gable, dormer, mansard and hip roofs shed water because of gravitational force. Flat roofs, on the other hand, collect rain water. Until the water is directed out and away from the flat roof structure, it will most likely develop pools that may inevitably leak and the accumulated weight will subsequently result in damage to the structure. That is why roofs with a slope of below 2% ought to have roof drains positioned at the lowest places on the roof in which water pools and should be uniformly spaced throughout the roof surface.

Types of Roof Drains


There are a number of distinct alternatives of roof drains. They basically fall into two groups: pitched roof drains and flat roof drains. Pitched roof rainwater drains normally comprise gutters that collect rainwater that travels via gravity to the roof periphery. Gutters direct this water towards downspouts which direct the water flow down and far away from the building or into sewer lines. Flat roof drains are one of three primary types: scuppers, inner drains or siphonic drains.

Roof Drain Scuppers


Scuppers are located on the roof's periphery. Scuppers 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 flow out and drain the roof top. Scuppers can connect to a downspout, or could be lengthened so that water is guided off of the building sides and foundation.

Inner Roof Drains


There are many types of inner drains for flat roofs. These are installed at low spots on the roof and attach to inner drainage pipes that drive water outdoors or into a sewer system. Many designs of inner roof drains have domes, strainers or covers that keep trash from blocking the roof drain pipe. These types of drains operate via gravity funneling 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 effective 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 incorporating an engineered baffle to the sump of the drain system it produces a siphonic drain which removes air from the system and permits smaller pipe diameters to be used. When all air is removed, a negative air pressure in the tail piece of the drain is set up which draws water 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 dome in and around Moulton, Alabama, give us a call. We'd be glad to help.