Roof Drains


There are a number of different varieties of roof drains and roof drain pan in Montgomery, AL and each is an unique answer to the wide range of roof styles and their drainage concerns. You must take into consideration the kind of roof, its size, and its roof pitch to be able to select the right drain. You also need to take into consideration the location of the drain, what amount of rainwater is anticipated and safe practices when selecting a roof drain for a home or business structure.

Gable, dormer, mansard and hip roofs shed rainwater water because of gravitational force. Flat roofs, on the other hand, collect rain water. Unless this water is routed out and away from the flat roof structure, it will most likely develop pools of water that could inevitably leak and the accumulated weight may subsequently result in damage to the structure. That is the reason that roofs with a slope of below two percent should have roof drains situated at the lowest spots on the roof where water pools and should be uniformly spread all throughout the roof top.

Kinds of Roof Drains


There are several distinct alternatives of roof drains. They basically fall into 2 categories: flat roof drains and pitched roof drains. Pitched roof rainwater drains usually consist of gutters which collect rainwater that travels via gravity to the roof edge. Gutters transport this water in the direction of downspouts which route the water flow down and away from the building or in to sewer lines. Flat roof drains can be one of three main types: scuppers, inner drains or siphonic drains.

Roof Rainwater Drain Scuppes


Scuppers are situated on the roof's periphery. Scuppers can also be installed on a balcony or terrace. Small holes are cut into the side of the roof structure so that rain water can flow out and drain the roof top. Scuppers can hook up to a downspout, or can be extended to make sure that water is guided away from the structure sides and foundation.

Interior Roof Drains


There are quite a few different types of inner drains for flat roofs. These are positioned at low places in the roof and connect to interior drainage pipes that route water outside or into a sewer system. Many designs of internal roof drains have domes, strainers or covers which prevent trash from obstructing the roof drain pipe. These kinds 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 go into the drain system producing pipe space occupied by both air and water. By incorporating an engineered baffle to the sump of the drain system it produces a siphonic drain that eliminates air from the system and allows for smaller sized pipe diameters . When all air is removed, 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 pitched roofs.

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