Roof Drains


At this time there are several different kinds of roof water drains and cast iron roof drain in Leeds, AL and each one is an unique solution to the variety of roof types and their drainage issues. You need to consider the type of roof, its size, and the roof pitch to be able to pick the right drain. You also need to take into consideration the site of the drain, what amount of rainwater is anticipated and safe practices when selecting a roof drain for a residence or commercial building.

Gambrel, dormers, hip and gable roofs shed water thanks to gravity. Flat roofs, conversely, collect rain water. Until the water is routed out and away from the roof structure, it will create pools that may eventually leak and the amassed weight may eventually cause structural damage. That is why roofs with a pitch of under 2% should have roof drains positioned in the lowest spots on the roof where water puddles and need to be uniformly spread throughout the roof surface.

Roof Drain Types


There are several distinct alternatives of roof drains. They generally fall into two categories: pitched roof drains and flat roof drains. Pitched roof rainwater drains normally consist of gutters which collect rainwater which passes via gravity down to the roof edge. Gutters direct this water in the direction of downspouts which route the water flow down and far away from the structure or in to sewers. Flat roof drains can be one of three primary types: scuppers, inner drains or siphonic drains.

Roof Rainwater Drain Scuppes


Scuppers are situated on the roof's perimeter. They can also be placed on a balcony or terrace. Small holes are cut in the side of the roof structure so rain water can empty 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 building sides and foundation.

Interior Roof Drains


There are quite a few different kinds of inner drains for flat roofs. They are positioned at low spots on the roof and connect to inner drainage pipes that route water outside or into a sewer system. Many designs of internal roof drains have domes, strainers or covers which keep 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 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 occupied by both air and water. By adding an engineered baffle to the sump of the drain system it creates a siphonic drain which eliminates 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 attracts rainwater 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 cast iron roof drain in and around Leeds, Alabama, give us a call. We'd be glad to help.