Roof Drains


At this time there are several different types of roof water drains and roof drain scupper in Semmes, AL and each one is a specific answer to the variety of roof styles and their drainage issues. You should take into consideration the type of roof, its dimensions, and the roof pitch to be able to pick the right drain. You also should take into consideration the site of the drain, what amount of rainwater is anticipated and safe practices when choosing a roof drain for a residence or commercial building.

Gable, dormer, mansard and hip roofs shed rainwater water due to gravitational force. Flat roofs, on the other hand, accumulate rain water. Unless this water is guided out and away from the flat roof , it will create pools of water that may eventually leak and the amassed weight will subsequently result in damage to the structure. That is the reason that roofs with a pitch of less than 2% should have roof drains located in the lowest places on the roof in which water pools and should be evenly spread all throughout the roof surface.

Kinds of Roof Drains


There are a number of different variations of roof drains. They generally fall into 2 groups: flat roof drains and pitched roof drains. Pitched roof rainwater drains usually comprise gutters which collect rainwater which travels by means of gravity to the roof edge. Gutters transport this water towards downspouts which route the water flow down and far away from the building or into sewers. Flat roof drains can be one of three main types: scuppers, inner drains or siphonic drains.

Roof Drain Scuppers


Scuppers are situated on a roof's periphery. They can also be put in on a balcony or terrace. Small holes are cut into the side of the roof structure so water can flow out and drain the roof top. Scuppers can connect to a downspout, or could be lengthened to make sure that water is directed away from the structure sides and foundation.

Inner Roof Drains


There are quite a few different kinds of inner drains for flat roofs. They are positioned at low places in the roof and connect to interior drainage pipes that route water outside or in to a sewer system. Many styles of inner roof drains have domes, strainers or covers which prevent trash from clogging the roof drain pipe. These types of drains operate via gravitational force funneling standing water through 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. Traditional 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 system it produces a siphonic drain which eliminates air from the system and allows for smaller pipe diameters . When all of the air is removed, a negative air pressure in the tail portion of the drain is established which attracts rainwater 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 scupper in and around Semmes, Alabama, give us a call. We'd be glad to help.