Roof Drains


There are a few distinct types of roof drains and roof drain system in Bessemer, AL and each one is an unique answer to the variety of roof styles and their drainage challenges. You must think about the kind 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 selecting a roof water drain for a residence or commercial building.

Gable, dormer, mansard and hip roofs shed rainwater water thanks to gravitational force. Flat roofs, conversely, collect water. Until this water is routed out and away from the roof structure, it will develop pools of water that may inevitably leak and the amassed weight may subsequently result in structural damage. That is the reason that roofs with a pitch of less than two percent should have roof drains located at the lowest places on the roof in which water puddles and need to be evenly spaced 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 consist of gutters that collect rainwater that passes by means of gravity down to the roof periphery. Gutters channel this water towards downspouts which steer the water flow down and far away from the structure or in to sewer lines. Flat roof drains are one of three main types: scuppers, inner drains or siphonic drains.

Roof Drain Scuppers


Scuppers are situated on a roof's perimeter. They can also be placed 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 surface. Scuppers can connect to a downspout, or could be lengthened to make sure that water is guided away from the structure sides and foundation.

Interior Roof Drains


There are many types of inner drains for flat roofs. These are installed at low areas in the roof and attach to inner drainage pipes that direct water outside or in to a sewer system. Many versions of internal roof drains have domes, strainers or covers which keep debris from obstructing the roof drain pipe. These kinds of drains work via gravity funneling 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. Standard 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 incorporating an engineered baffle to the sump of the drain system it creates a siphonic drain which removes air from the system and permits smaller pipe diameters . When all air is eliminated, a negative air pressure in the tail piece of the drain is established which pulls water off the roof siphonically. Though used mainly 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 system in and around Bessemer, Alabama, give us a call. We'd be glad to help.