Roof Drains


There are several distinct kinds of roof water drains and roof drain pvc in Oxford, AL and each is a specific answer to the wide range of roof styles and their drainage issues. You should look at the kind of roof, its dimensions, and its roof pitch to be able to select the right drain. You also should take into account the location of the drain, how much rainwater is expected and safety when choosing a roof water drain for a residence or commercial structure.

Hip roofs, dormers, gable and mansard roofs shed water thanks to gravity. Flat roofs, on the other hand, collect water. Until this water is directed out and away from the flat roof structure, it will develop pools that could inevitably leak and the amassed weight may eventually cause damage to the structure. That is why roofs with a pitch of under two percent ought to have roof drains situated at the lowest places on the roof where water pools and should be uniformly spaced all 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 drains usually consist of gutters that accumulate rainwater that passes by means of gravity down 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 into sewers. Flat roof drains are one of three main types: scuppers, inner drains or siphonic drains.

Roof Rainwater Drain Scuppes


Scuppers are located on a roof's perimeter. Scuppers can also be placed on a balcony or terrace. Small openings are cut in the side of the roof structure so water can flow out and drain the roof surface. Scuppers can hook up to a downspout, or can be lengthened so that water is directed 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 spots on the roof and connect to inner drainage pipes that drive water outside or into a sewer system. Several styles of inner roof drains have domes, strainers or covers that prevent trash from obstructing the roof drain pipe. These kinds of drains work via gravitational force channeling pooling water thru the roof drain system. They can be constructed from PVC, cast iron or cast aluminum.

Siphonic Roof Drains

Siphonic roof drains are a more effective alternative to gravity drainage. Traditional flat roof drainage permits both air and water to enter the drain system creating pipe space which is 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 sized pipe diameters to be used. When all of the air is removed, a negative air pressure in the tail piece of the drain is set up which pulls rainwater off the roof siphonically. Though used mainly for flat roofs, siphonic drains can also be set up on angled roofs.

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