Roof Drains


At this time there are several different kinds of roof water drains and roof drain pvc in Helena, AL and each is an unique answer to the wide range of roof styles and their drainage challenges. You must look at the kind of roof, its dimensions, and its roof pitch to be able to select the most suitable drain. You also should take into account the site of the drain, how much rainwater is anticipated and safe practices when selecting a roof water drain for a residence or commercial structure.

Gambrel, dormers, hip and gable roofs shed water because of gravity. Flat roofs, conversely, collect rain water. Until this water is guided out and away from the flat roof structure, it will most likely develop pools of water that could inevitably leak and the amassed weight may subsequently result in damage to the structure. That is why roofs with a pitch of under 2% ought to have roof drains located at the lowest spots on the roof in which water pools and should be uniformly spread throughout the roof top.

Roof Drain Types


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 that collect rainwater that travels by means of gravity down to the roof periphery. Gutters channel this water towards downspouts which route the water flow down and far away from the structure or into sewer lines. 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 in the side of the roof structure so that water can flow out and drain the roof surface. Scuppers can hook up to a downspout, or can be lengthened to make sure that water is directed off of the structure sides and foundation.

Inner Roof Drains


There are quite a few different kinds of inner drains for flat roofs. These are installed at low spots on the roof and connect to inner drainage pipes that direct water outdoors or into a sewer system. Several styles of inner roof drains have domes, strainers or covers which keep debris from blocking the roof drain pipe. These kinds of drains work via gravity funneling pooling 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. Standard flat roof drainage permits both air and water to go into the drain system producing pipe space which is occupied by both air and water. By adding an engineered baffle to the sump of the drain system it creates a siphonic drain that eliminates air from the system and permits smaller pipe diameters . When all air is removed, a negative air pressure in the tail piece of the drain is established which attracts water 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 pvc in and around Helena, Alabama, give us a call. We'd be glad to help.