Roof Drains


There are several distinct types of roof drains and roof drain pipe in Birmingham, AL and each is a specific answer to the variety of roof types and their drainage issues. You need to think about the type of roof, its size, and its roof pitch to be able to choose the right drain. You also should think about the location of the drain, how much rainwater is expected and safe practices when selecting a roof water drain for a home or commercial building.

Gambrel, dormers, hip and gable roofs shed water because of gravitational force. Flat roofs, on the other hand, accumulate rain water. Until the water is routed out and away from the roof , it will most likely create pools that may eventually leak and the amassed weight will subsequently cause structural damage. That is why roofs with a pitch of below 2% ought to have roof drains located at the lowest areas on the roof where water puddles and should be evenly spaced all throughout the roof surface.

Types of Roof Drains


There are several different alternatives of roof drains. They basically fall into two categories: pitched roof drains and flat roof drains. Pitched roof drains usually comprise gutters which accumulate rainwater which travels via gravity to the roof edge. Gutters transport this water in the direction of downspouts which route the water flow down and away from the building or in to sewers. Flat roof drains are one of three main types: scuppers, inner drains or siphonic drains.

Roof Rainwater Drain Scuppes


Scuppers are situated on the roof's periphery. Scuppers can also be put in on a balcony or terrace. Small holes are cut into the side of the roof structure so that rain water can empty and drain the roof surface. Scuppers can hook up to a downspout, or can be lengthened so that water is guided away from the building sides and foundation.

Inner Roof Drains


There are quite a few different kinds of inner drains for flat roofs. They are installed at low areas in the roof and attach to interior drainage pipes that route water outdoors or into a sewer system. Many designs of inner roof drains have domes, strainers or covers which keep trash from clogging the roof drain pipe. These types of drains operate via gravity 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 alternative to 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 incorporating an engineered baffle to the sump of the drain body it produces a siphonic drain that removes air from the system and permits 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. Though 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 pipe in and around Birmingham, Alabama, give us a call. We'd be glad to help.