Roof Drains


At this time there are several different types of roof water drains and roof drain scupper in Helena, AL and each is a specific approach to the variety of roof styles and their drainage concerns. You should consider the type of roof, its size, and its roof pitch to be able to choose the most suitable drain. You also should take into consideration the location of the drain, how much rainwater is anticipated and safe practices when selecting a roof drain for a residence or commercial building.

Gambrel, dormers, hip and gable roofs shed water because of gravitational force. Flat roofs, alternatively, accumulate rain water. Unless the water is directed out and away from the flat roof , it will most likely develop pools of water that could eventually leak and the amassed weight may subsequently cause structural damage. That is why roofs with a slope of less than 2% ought to have roof drains located at the lowest spots on the roof where water pools and should be uniformly spread all throughout the roof surface.

Types of Roof Drains


There are a number of different variations of roof drains. They generally fall into 2 categories: flat roof drains and pitched roof drains. Pitched roof drains usually comprise gutters that collect rainwater that travels via gravity down to the roof periphery. Gutters channel this water in the direction of downspouts which route the water flow down and far away from the building or in to sewer lines. Flat roof drains are one of three main types: scuppers, inner drains or siphonic drains.

Roof Drain Scuppers


Scuppers are located on a roof's periphery. Scuppers can also be put in on a balcony or terrace. Small holes are cut into the side of the roof structure so rain water can flow out and drain the roof surface. Scuppers can hook up to a downspout, or can be extended so that water is directed off of the building sides and foundation.

Interior Roof Drains


There are quite a few different kinds of inner drains for flat roofs. These are positioned at low spots on the roof and attach to interior drainage pipes that direct water outside or in to a sewer system. Many models of inner roof drains have domes, strainers or covers which keep trash from clogging the roof drain pipe. These types of drains work 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. Standard flat roof drainage permits both air and water to go into the drain system creating 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 permits smaller pipe diameters to be used. When all air is removed, a negative air pressure in the tail portion of the drain is established which draws rainwater off the roof siphonically. Though used mainly 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 scupper in and around Helena, Alabama, give us a call. We'd be glad to help.