Roof Drains


There are a number of different kinds of roof water drains and roof drain strainer in Pelham, AL and each is a specific approach to the wide range of roof styles and their drainage concerns. You need to look at the kind of roof, its size, and the roof pitch to be able to select the correct drain. You also need to think about the location of the drain, how much rainwater is anticipated and safe practices when selecting a roof drain for a house or business building.

Gambrel, dormers, hip and gable roofs shed water because of gravitational force. Flat roofs, on the other hand, accumulate rain water. Until the water is directed out and away from the flat roof structure, it will create pools that could inevitably leak and the amassed weight will eventually cause damage to the structure. That is why roofs with a pitch of below 2% ought to have roof drains located at the lowest areas on the roof where water pools and need to be evenly spread all throughout the roof surface.

Types of Roof Drains


There are several distinct alternatives of roof drains. They generally fall into two categories: pitched roof drains and flat roof drains. Pitched roof rainwater drains usually consist of gutters that collect rainwater that travels by means of gravity to the roof periphery. Gutters transport this water in the direction of downspouts which direct the water flow down and far away from the structure or into sewers. Flat roof drains can be one of three main types: scuppers, inner drains or siphonic drains.

Roof Drain Scuppers


Scuppers are located on a roof's perimeter. They can also be put in on a balcony or terrace. Small openings are cut into the side of the roof structure so 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 directed away from the structure sides and foundation.

Interior Roof Drains


There are many types of inner drains for flat roofs. They are positioned at low spots on the roof and connect to interior drainage pipes that drive water outdoors or into a sewer system. Several versions of inner roof drains have domes, strainers or covers that prevent debris from blocking the roof drain pipe. These kinds of drains work via gravity funneling pooling 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. Conventional flat roof drainage allows 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 system it creates a siphonic drain which removes air from the system and permits smaller pipe diameters . When all of the air is eliminated, a negative air pressure in the tail portion of the drain is established which pulls water 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 strainer in and around Pelham, Alabama, give us a call. We'd be glad to help.