Roof Drains


At this time there are a number of distinct kinds of roof drains and roof drain downspout in Pinson, AL and each one is an unique answer to the variety of roof styles and their drainage issues. You should think about the type of roof, its size, and its roof pitch to be able to select the correct drain. You also may want to think about the location of the drain, what amount of rainwater is expected and safe practices when choosing a roof water drain for a home or business building.

Hip roofs, dormers, gable and mansard roofs shed water because of gravitational force. Flat roofs, alternatively, collect rain water. Unless the water is directed 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 result in structural damage. That is the reason that roofs with a slope of below two percent ought to have roof drains positioned in the lowest areas on the roof where water pools and should be uniformly spread throughout the roof surface.

Kinds of Roof Drains


There are a number of distinct variations of roof drains. They basically fall into 2 categories: flat roof drains and pitched roof drains. Pitched roof rainwater drains usually comprise gutters which accumulate rainwater which passes via gravity down to the roof edge. Gutters direct 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 located on the roof's perimeter. They can also be put in on a balcony or terrace. Small holes are cut into the side of the roof structure so water can flow out and drain the roof surface. Scuppers can attach to a downspout, or can be extended so that water is guided away from the building sides and foundation.

Interior Roof Drains


There are many types of inner drains for flat roofs. They are installed at low spots on the roof and connect to interior drainage pipes that direct water outside or into a sewer system. Many styles of inner roof drains have domes, strainers or covers which prevent debris from obstructing the roof drain pipe. These types of drains work via gravitational force funneling pooling water through the roof drain system. They are constructed from 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 creating pipe space which is occupied by both air and water. By incorporating an engineered baffle to the sump of the drain body it produces a siphonic drain that eliminates air from the system and permits smaller pipe diameters . When all of the air is eliminated, a negative air pressure in the tail piece of the drain is set up which pulls water off the roof siphonically. Although 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 downspout in and around Pinson, Alabama, give us a call. We'd be glad to help.