Roof Drains


There are a number of different varieties of roof drains and roof drain scupper in Madison, AL and each is a specific solution to the wide range of roof types and their drainage issues. You must think about the kind of roof, its dimensions, and the roof pitch to be able to choose the most suitable drain. You also should think about the site of the drain, what amount of rainwater is anticipated and safety when choosing a roof water drain for a house or business structure.

Hip roofs, dormers, gable and mansard roofs shed rainwater water due to gravity. Flat roofs, conversely, accumulate water. Unless the water is guided out and away from the roof , it will develop pools that could eventually leak and the accumulated weight will eventually result in structural damage. That is why roofs with a slope of less than 2% should have roof drains positioned at the lowest spots on the roof in which water pools and should be uniformly spread throughout the roof top.

Roof Drain Kinds


There are a number of different variations of roof drains. They basically fall into 2 groups: pitched roof drains and flat roof drains. Pitched roof drains usually comprise gutters which accumulate rainwater that passes via gravity down to the roof edge. Gutters transport this water in the direction of downspouts which steer the water flow down and far away from the building or in to sewers. Flat roof drains are one of three primary types: scuppers, inner drains or siphonic drains.

Roof Drain Scuppers


Scuppers are situated on a roof's perimeter. Scuppers 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 top. Scuppers can connect to a downspout, or can be extended to make sure that water is guided off of 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 areas in the roof and attach to interior drainage pipes that route water outdoors or in to a sewer system. Many models of inner roof drains have domes, strainers or covers that prevent debris from obstructing the roof drain pipe. These types of drains work via gravity channeling standing water through the roof drain system. They are made of PVC, cast iron or cast aluminum.

Siphonic Roof Drains

Siphonic roof drains are a more efficient substitute for gravity drainage. Standard 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 creates a siphonic drain which eliminates air from the system and permits smaller sized pipe diameters to be used. When all air is removed, a negative air pressure in the tail portion of the drain is set up which attracts water off the roof siphonically. Although used mainly for flat roofs, siphonic drains can also be installed on angled roofs.

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