Roof Drains


At this time there are several different varieties of roof water drains and roof drain scupper in Harvest, AL and each one is a specific solution to the wide range of roof types and their drainage concerns. You need to look at the kind of roof, its dimensions, and its roof pitch to be able to pick the most suitable drain. You also need to take into account the location of the drain, what amount of rainwater is expected and safe practices when selecting a roof drain for a residence or business building.

Gable, dormer, mansard and hip roofs shed water due to gravity. Flat roofs, conversely, accumulate rain water. Unless the water is routed out and away from the roof , it will most likely create pools of water that may inevitably leak and the accumulated weight may eventually result in compromising the integrity of the structure. That is why roofs with a pitch of below 2% should have roof drains positioned in the lowest places on the roof in which water pools and should be uniformly spaced throughout the roof top.

Roof Drain Kinds


There are a number of different alternatives of roof drains. They basically fall into 2 categories: flat roof drains and pitched roof drains. Pitched roof rainwater drains usually consist of gutters which collect rainwater which passes by means of gravity down to the roof periphery. Gutters channel this water towards downspouts which direct the water flow down and far away from the building or into sewers. Flat roof drains can be one of three main types: scuppers, inner drains or siphonic drains.

Roof Rainwater Drain Scuppes


Scuppers are located on the roof's perimeter. Scuppers can also be put in on a balcony or terrace. Small holes are cut into 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 lengthened so that water is directed off of the structure 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 in the roof and attach to interior drainage pipes that direct water outside or in to a sewer system. Several styles of inner roof drains have domes, strainers or covers that keep debris from clogging the roof drain pipe. These kinds of drains work via gravity channeling pooling water through the roof drain system. They are made from 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 body it produces a siphonic drain that eliminates air from the system and permits smaller pipe diameters to be used. When all air is removed, a negative air pressure in the tail portion of the drain is established which pulls water off the roof siphonically. Though used primarily for flat roofs, siphonic drains can also be installed on pitched roofs.

If you need more information about flat roof drain or roof drain scupper in and around Harvest, Alabama, give us a call. We'd be glad to help.