Roof Drains


At this time there are several different types of roof drains and roof drain pipe in Muscle Shoals, AL and each one is an unique approach to the wide range of roof types and their drainage challenges. You should look at the kind of roof, its dimensions, and the roof pitch to be able to select the correct drain. You also may want to take into account the site of the drain, what amount of rainwater is expected and safe practices when choosing a roof drain for a residence or commercial building.

Hip roofs, dormers, gable and mansard roofs shed water thanks to gravitational force. Flat roofs, conversely, collect rain water. Until this water is routed out and away from the flat roof structure, it will develop pools that could inevitably leak and the amassed weight may subsequently cause compromising the integrity of the structure. That is why roofs with a pitch of below two percent ought to have roof drains located at the lowest spots on the roof in which water puddles and should be evenly spread all throughout the roof top.

Kinds 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 comprise gutters which accumulate rainwater which passes via gravity to the roof edge. Gutters direct this water in the direction of downspouts which steer 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 Rainwater Drain Scuppes


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

Interior Roof Drains


There are quite a few different types of inner drains for flat roofs. They are installed at low places on the roof and connect to inner drainage pipes that route water outdoors or in to a sewer system. Several versions of inner roof drains have domes, strainers or covers that prevent trash from clogging the roof drain pipe. These kinds of drains work via gravitational force funneling standing water thru the roof drain system. They can be constructed from PVC, cast iron or cast aluminum.

Siphonic Roof Drains

Siphonic roof drains are a more efficient substitute for gravity drainage. Traditional flat roof drainage permits both air and water to enter the drain system producing pipe space occupied by both air and water. By adding an engineered baffle to the sump of the drain system it produces a siphonic drain that removes air from the system and permits smaller sized pipe diameters to be used. When all air is removed, a negative air pressure in the tail portion of the drain is established which pulls rainwater off the roof siphonically. Though used primarily for flat roofs, siphonic drains can also be set up on angled roofs.

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