Roof Drains


There are several distinct kinds of roof drains and roof drain pvc in Grand Bay, AL and each one is an unique solution to the wide range of roof types and their drainage challenges. You should take into consideration the type of roof, its dimensions, and the roof pitch to be able to select the correct drain. You also need to take into consideration the site of the drain, how much rainwater is expected and safety when choosing a roof water drain for a home or commercial structure.

Gambrel, dormers, hip and gable roofs shed water thanks to gravitational force. Flat roofs, on the other hand, accumulate rain water. Until the water is directed out and away from the roof , it will most likely create pools that may eventually leak and the accumulated weight may subsequently result in structural damage. That is why roofs with a slope of less than 2% should have roof drains located in 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 distinct variations of roof drains. They generally fall into two categories: pitched roof drains and flat roof drains. Pitched roof rainwater drains usually comprise gutters which collect rainwater which travels via gravity to the roof periphery. Gutters direct this water in the direction of downspouts which route the water flow down and far away from the building or into sewers. Flat roof drains can be one of three main types: scuppers, inner drains or siphonic drains.

Roof Rainwater Drain Scuppes


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

Interior Roof Drains


There are many kinds of inner drains for flat roofs. They are positioned at low places in the roof and attach to inner drainage pipes that route water outside or into a sewer system. Many styles of inner roof drains have domes, strainers or covers which keep debris from obstructing the roof drain pipe. These kinds of drains operate via gravity funneling standing water thru the roof drain system. They are made of PVC, cast iron or cast aluminum.

Siphonic Roof Drains

Siphonic roof drains are a more efficient alternative to gravity drainage. Conventional flat roof drainage allows both air and water to enter the drain system creating pipe space occupied by both air and water. By incorporating an engineered baffle to the sump of the drain body it creates a siphonic drain that eliminates air from the system and allows for smaller pipe diameters to be used. When all of the air is removed, a negative air pressure in the tail piece of the drain is set up which attracts 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 pvc in and around Grand Bay, Alabama, give us a call. We'd be glad to help.