Roof Drains


At this time there are a few different varieties of roof water drains and roof drain downspout in Madison, AL and each is a specific solution to the variety of roof styles and their drainage challenges. You need to consider the kind of roof, its size, and the roof pitch to be able to choose the most suitable drain. You also should take into consideration the site of the drain, what amount of rainwater is anticipated and safe practices when choosing a roof water drain for a house or commercial structure.

Hip roofs, dormers, gable and mansard roofs shed rainwater water because of gravity. Flat roofs, alternatively, accumulate water. Until the water is routed out and away from the roof structure, it will most likely create pools of water that could eventually leak and the accumulated weight may subsequently cause damage to the structure. That is why roofs with a slope of less than two percent ought to have roof drains located in the lowest spots on the roof where water puddles and should be evenly spaced throughout the roof top.

Kinds of Roof Drains


There are several distinct variations of roof drains. They basically fall into two categories: pitched roof drains and flat roof drains. Pitched roof drains normally comprise gutters which accumulate rainwater which passes via gravity to the roof edge. Gutters direct this water in the direction of downspouts which route the water flow down and far away from the building or in to 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. They can also be installed on a balcony or terrace. Small holes are cut in the side of the roof structure so rain water can flow out and drain the roof top. Scuppers can attach to a downspout, or can be extended to make sure that water is directed off of the structure sides and foundation.

Inner Roof Drains


There are many kinds of inner drains for flat roofs. These are positioned at low areas in the roof and attach to inner drainage pipes that drive water outside or into a sewer system. Many versions of inner roof drains have domes, strainers or covers which prevent trash from blocking the roof drain pipe. These types of drains operate via gravity funneling pooling water thru the roof drain system. They are made of PVC, cast iron or cast aluminum.

Siphonic Roof Drains

Siphonic roof drains are a more efficient alternative to gravity drainage. Standard flat roof drainage allows both air and water to go into the drain system producing pipe space which is occupied by both air and water. By incorporating an engineered baffle to the sump of the drain system it creates a siphonic drain which eliminates air from the system and allows for smaller sized pipe diameters . When all air is eliminated, a negative air pressure in the tail piece of the drain is set up which pulls water off the roof siphonically. Though used mainly for flat roofs, siphonic drains can also be installed on pitched roofs.

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