Roof Drains


There are a few distinct varieties of roof drains and roof drain strainer in Decatur, AL and each one is a specific approach to the wide range of roof styles and their drainage concerns. You should 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 choosing a roof water drain for a house or commercial building.

Hip roofs, dormers, gable and mansard roofs shed rainwater water due to gravitational force. Flat roofs, on the other hand, accumulate rain water. Until the water is directed out and away from the flat roof structure, it will most likely develop pools of water that may eventually leak and the accumulated weight may subsequently result in compromising the integrity of the structure. That is why roofs with a slope of below 2% ought to have roof drains located at the lowest areas on the roof where water pools and need to be uniformly spaced all throughout the roof top.

Roof Drain Types


There are several different alternatives of roof drains. They generally fall into 2 groups: flat roof drains and pitched roof drains. Pitched roof rainwater drains usually consist of gutters which accumulate rainwater that travels by means of gravity down to the roof edge. Gutters transport this water towards downspouts which steer 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 perimeter. They can also be placed on a balcony or terrace. Small openings 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 could be lengthened to make sure that water is guided away from the structure 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 in the roof and connect to inner drainage pipes that direct water outside or in to a sewer system. Several designs of internal roof drains have domes, strainers or covers that keep trash from blocking the roof drain pipe. These kinds of drains operate via gravity channeling pooling water through the roof drain system. They can be made 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 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 which eliminates air from the system and allows for smaller pipe diameters to be used. When all of the air is eliminated, a negative air pressure in the tail piece of the drain is established which pulls water off the roof siphonically. Although used primarily for flat roofs, siphonic drains can also be installed on angled roofs.

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