Roof Drains


At this time there are a few different types of roof water drains and roof drain system in Jasper, AL and each one is a specific solution to the wide range of roof types and their drainage challenges. You must take into consideration the type of roof, its size, and its roof pitch to be able to select the most suitable drain. You also may want to take into account the site of the drain, how much rainwater is expected and safety when choosing a roof drain for a home or commercial building.

Gable, dormer, mansard and hip roofs shed rainwater water thanks to gravity. Flat roofs, alternatively, collect water. Unless this water is directed out and away from the flat roof structure, it will create pools of water that could eventually leak and the amassed weight will eventually result in damage to the structure. That is the reason that roofs with a slope of below two percent should have roof drains located at the lowest areas on the roof where water pools and need to be evenly spaced all throughout the roof top.

Roof Drain Kinds


There are a number of different variations of roof drains. They basically fall into two categories: flat roof drains and pitched roof drains. Pitched roof drains usually consist of gutters which accumulate rainwater that travels by means of gravity down to the roof edge. Gutters direct 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 main types: scuppers, inner drains or siphonic drains.

Roof Rainwater Drain Scuppes


Scuppers are located on the roof's periphery. Scuppers can also be placed on a balcony or terrace. Small openings are cut into the side of the roof structure so that rain water can empty and drain the roof surface. Scuppers can attach to a downspout, or can be lengthened so that water is directed off of the structure sides and foundation.

Interior Roof Drains


There are many types of inner drains for flat roofs. They are positioned at low areas on the roof and connect to inner drainage pipes that direct water outside or in to a sewer system. Many designs of internal roof drains have domes, strainers or covers which prevent trash from blocking the roof drain pipe. These kinds of drains work via gravitational force channeling standing water through the roof drain system. They can be made from PVC, cast iron or cast aluminum.

Siphonic Roof Drains

Siphonic roof drains are a more efficient alternative to gravity drainage. Traditional 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 eliminates air from the system and permits smaller pipe diameters to be used. When all air is eliminated, a negative air pressure in the tail portion of the drain is established which pulls water off the roof siphonically. Although used primarily 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 system in and around Jasper, Alabama, give us a call. We'd be glad to help.