Roof Drains


At this time there are a number of distinct varieties of roof drains and roof drain pan in Mobile, AL and each is a specific answer to the variety of roof types and their drainage challenges. You should look at the kind of roof, its size, and its roof pitch to be able to pick the correct drain. You also may want to take into account the location of the drain, what amount of rainwater is expected and safe practices when selecting a roof drain for a residence or business building.

Gable, dormer, mansard and hip roofs shed rainwater water due to gravity. Flat roofs, alternatively, accumulate water. Unless the water is routed out and away from the flat roof , it will most likely develop pools that may inevitably leak and the accumulated weight may subsequently cause structural damage. That is the reason that roofs with a slope of below two percent ought to have roof drains situated at the lowest spots on the roof in which water pools and should be uniformly spaced throughout the roof surface.

Roof Drain Kinds


There are several distinct variations of roof drains. They generally fall into two categories: flat roof drains and pitched roof drains. Pitched roof drains usually consist of gutters which collect rainwater which passes by means of gravity down to the roof periphery. Gutters direct this water towards downspouts which steer the water flow down and far away from the building or into sewer lines. 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 periphery. They can also be installed on a balcony or terrace. Small holes are cut into the side of the roof structure so that water can flow out and drain the roof surface. Scuppers can connect to a downspout, or could be lengthened to make sure that water is directed off of the structure sides and foundation.

Interior Roof Drains


There are quite a few different types of inner drains for flat roofs. These are positioned at low places in the roof and attach to interior drainage pipes that drive water outdoors or in to a sewer system. Many styles of inner roof drains have domes, strainers or covers that keep trash from clogging the roof drain pipe. These kinds of drains work via gravitational force funneling standing 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 effective alternative to gravity drainage. Traditional flat roof drainage allows both air and water to enter the drain system producing pipe space which is occupied by both air and water. By adding 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 air is eliminated, a negative air pressure in the tail portion of the drain is set up which draws rainwater off the roof siphonically. Although used primarily for flat roofs, siphonic drains can also be set up on pitched roofs.

If you need more information about flat roof drain or roof drain pan in and around Mobile, Alabama, give us a call. We'd be glad to help.