Roof Drains

There are several different varieties of roof drains and roof drain pipe in Killen, AL and each one is an unique solution to the wide range of roof types and their drainage challenges. You must take into consideration the kind of roof, its size, and the roof pitch to be able to select the most suitable drain. You also need to take into consideration the location of the drain, what amount of rainwater is expected and safety when choosing a roof water drain for a residence or business structure.

Gable, dormer, mansard and hip roofs shed water thanks to gravity. Flat roofs, alternatively, accumulate rain water. Unless the water is guided out and away from the roof , it will create pools that may eventually leak and the amassed weight may eventually result in compromising the integrity of the structure. That is the reason that roofs with a slope of less than two percent should have roof drains positioned at the lowest areas on the roof in which water pools and need to be uniformly spaced all throughout the roof top.

Kinds of Roof Drains

There are several different alternatives of roof drains. They basically fall into 2 categories: pitched roof drains and flat roof drains. Pitched roof 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 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 situated on a roof's periphery. Scuppers can also be installed on a balcony or terrace. Small openings are cut in the side of the roof structure so rain water can flow out and drain the roof surface. Scuppers can connect to a downspout, or can be lengthened to make sure that water is directed off of the building sides and foundation.

Interior Roof Drains

There are quite a few different types of inner drains for flat roofs. They are positioned at low areas in the roof and attach to inner drainage pipes that route water outdoors or into a sewer system. Several versions of inner roof drains have domes, strainers or covers which keep debris from blocking the roof drain pipe. These types of drains operate via gravitational force funneling pooling water through the roof drain system. They can be constructed from PVC, cast iron or cast aluminum.

Siphonic Roof Drains

Siphonic roof drains are a more efficient alternative to gravity drainage. Traditional flat roof drainage allows 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 eliminates air from the system and allows for smaller pipe diameters . When all of the air is eliminated, a negative air pressure in the tail piece of the drain is set up which pulls rainwater off the roof siphonically. Although used primarily 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 pipe in and around Killen, Alabama, give us a call. We'd be glad to help.