Roof Drains


At this time there are several distinct types of roof drains and roof drain downspout in Prattville, AL and each one is a specific solution to the wide range of roof styles and their drainage challenges. You need to take into consideration the type of roof, its size, and the roof pitch to be able to pick the right drain. You also need to take into consideration the location of the drain, how much rainwater is expected and safe practices when choosing a roof water drain for a house or commercial building.

Hip roofs, dormers, gable and mansard roofs shed water because of gravitational force. Flat roofs, on the other hand, accumulate rain water. Unless the water is directed out and away from the roof structure, it will most likely create pools of water that could eventually leak and the amassed weight may eventually result in structural damage. That is why roofs with a slope of less than two percent ought to have roof drains situated in the lowest areas on the roof in which water puddles and need to be evenly spread all throughout the roof top.

Types of Roof Drains


There are several distinct alternatives of roof drains. They generally fall into 2 groups: pitched roof drains and flat roof drains. Pitched roof drains normally comprise gutters that collect rainwater that travels by means of gravity to the roof edge. Gutters transport this water towards downspouts which direct the water flow down and away from the building or in to sewers. Flat roof drains are one of three primary types: scuppers, inner drains or siphonic drains.

Roof Rainwater Drain Scuppes


Scuppers are located on the roof's periphery. They can also be put in on a balcony or terrace. Small holes are cut into the side of the roof structure so that rain water can empty and drain the roof surface. Scuppers can attach to a downspout, or can be extended to make sure that water is guided 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 installed at low places on the roof and connect to interior drainage pipes that drive water outside or into a sewer system. Several versions of inner roof drains have domes, strainers or covers that prevent debris from obstructing the roof drain pipe. These types of drains operate via gravity funneling pooling water thru the roof drain system. They can be made of PVC, cast iron or cast aluminum.

Siphonic Roof Drains

Siphonic roof drains are a more effective alternative to gravity drainage. Traditional flat roof drainage allows both air and water to go into the drain system creating pipe space occupied by both air and water. By adding an engineered baffle to the sump of the drain body it produces a siphonic drain that removes air from the system and allows for smaller pipe diameters to be used. When all of the air is removed, a negative air pressure in the tail piece of the drain is established which pulls rainwater 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 downspout in and around Prattville, Alabama, give us a call. We'd be glad to help.