Roof Drains


At this time there are several different kinds of roof drains and roof drain system in Saraland, AL and each is a specific approach to the wide range of roof types and their drainage concerns. You must think about the type of roof, its dimensions, and the roof pitch to be able to choose the correct drain. You also may want to think about the site of the drain, how much rainwater is anticipated and safe practices when selecting a roof drain for a residence or commercial structure.

Gambrel, dormers, hip and gable roofs shed water thanks to gravitational force. Flat roofs, conversely, accumulate rain water. Until the water is routed out and away from the flat roof , it will create pools of water that may inevitably leak and the amassed weight may subsequently result in structural damage. That is why roofs with a slope of less than two percent should have roof drains positioned in the lowest spots on the roof in which water puddles and should be evenly spread throughout the roof top.

Kinds of Roof Drains


There are a number of different alternatives of roof drains. They basically fall into two categories: flat roof drains and pitched roof drains. Pitched roof rainwater drains normally comprise gutters which accumulate rainwater which travels via gravity down to the roof edge. Gutters channel this water towards downspouts which steer the water flow down and away from the building or into sewer lines. Flat roof drains can be one of three primary 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 openings are cut into the side of the roof structure so rain 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 off of the building sides and foundation.

Inner Roof Drains


There are quite a few different types of inner drains for flat roofs. They are positioned at low spots on the roof and attach to interior drainage pipes that route water outdoors or in to a sewer system. Many models of internal roof drains have domes, strainers or covers that keep debris from blocking the roof drain pipe. These kinds of drains work via gravitational force channeling standing water thru the roof drain system. They are constructed from PVC, cast iron or cast aluminum.

Siphonic Roof Drains

Siphonic roof drains are a more effective substitute for gravity drainage. Conventional flat roof drainage allows 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 which eliminates air from the system and allows for smaller pipe diameters . When all of the air is eliminated, a negative air pressure in the tail portion of the drain is set up which draws 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 Saraland, Alabama, give us a call. We'd be glad to help.