Roof Drains


There are a few distinct varieties of roof drains and roof drain pvc in Montgomery, AL and each is a specific approach to the wide range of roof styles and their drainage challenges. You should think about the type of roof, its size, and the roof pitch to be able to choose the right drain. You also need to think about the location of the drain, what amount of rainwater is expected and safety when selecting a roof water drain for a home or commercial building.

Gambrel, dormers, hip and gable roofs shed rainwater water due to gravitational force. Flat roofs, conversely, accumulate water. Until the water is directed out and away from the flat roof structure, it will develop pools that could eventually leak and the accumulated weight may subsequently cause structural damage. That is the reason that roofs with a slope of less than 2% ought to have roof drains located in the lowest places on the roof where water pools and should be evenly spaced throughout the roof top.

Roof Drain Types


There are several distinct variations of roof drains. They basically fall into 2 groups: pitched roof drains and flat roof drains. Pitched roof drains usually consist of gutters that accumulate rainwater which travels by means of gravity down to the roof edge. Gutters channel this water towards downspouts which route the water flow down and far away from the structure or into sewers. Flat roof drains are one of three main types: scuppers, inner drains or siphonic drains.

Roof Rainwater Drain Scuppes


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

Interior Roof Drains


There are quite a few different kinds of inner drains for flat roofs. They are installed at low spots on the roof and attach to interior drainage pipes that direct water outdoors or into a sewer system. Several versions of internal roof drains have domes, strainers or covers that keep debris from blocking the roof drain pipe. These types of drains work via gravity funneling standing water thru the roof drain system. They can be constructed from PVC, cast iron or cast aluminum.

Siphonic Roof Drains

Siphonic roof drains are a more effective alternative to gravity drainage. Standard flat roof drainage allows both air and water to enter the drain system creating pipe space occupied by both air and water. By adding an engineered baffle to the sump of the drain system it produces a siphonic drain which eliminates air from the system and allows for smaller sized pipe diameters to be used. When all of the air is removed, a negative air pressure in the tail portion of the drain is established which pulls water off the roof siphonically. Though used primarily 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 pvc in and around Montgomery, Alabama, give us a call. We'd be glad to help.