Roof Drains


At this time there are a number of different varieties of roof drains and roof drain strainer in Mobile, AL and each is a specific approach to the wide range of roof styles and their drainage issues. You should consider the type of roof, its size, and the roof pitch to be able to pick the correct drain. You also may want to take into account the location 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 rainwater water due to gravity. Flat roofs, on the other hand, collect water. Until the water is guided out and away from the roof structure, it will develop pools of water that may inevitably leak and the amassed weight will subsequently cause damage to the structure. That is the reason that roofs with a pitch of below 2% should have roof drains positioned at the lowest areas on the roof where water pools and should be evenly spread throughout the roof top.

Roof Drain Kinds


There are a number of different alternatives of roof drains. They basically fall into 2 categories: pitched roof drains and flat roof drains. Pitched roof rainwater drains normally comprise gutters that accumulate rainwater that passes by means of gravity down to the roof periphery. Gutters direct this water towards downspouts which direct the water flow down and far away from the building or into sewer lines. Flat roof drains are one of three main types: scuppers, inner drains or siphonic drains.

Roof Rainwater Drain Scuppes


Scuppers are located on a roof's periphery. Scuppers can also be placed on a balcony or terrace. Small holes are cut in the side of the roof structure so water can empty and drain the roof surface. Scuppers can hook up to a downspout, or can be lengthened to make sure that water is directed off of the building sides and foundation.

Inner Roof Drains


There are many types of inner drains for flat roofs. They are positioned at low areas on the roof and attach to interior drainage pipes that route water outdoors or in to a sewer system. Many designs of internal roof drains have domes, strainers or covers that keep debris from blocking the roof drain pipe. These kinds of drains operate via gravitational force funneling standing water thru the roof drain system. They can be made of PVC, cast iron or cast aluminum.

Siphonic Roof Drains

Siphonic roof drains are a more effective substitute for gravity drainage. Traditional flat roof drainage permits both air and water to enter the drain system producing pipe space which is occupied by both air and water. By incorporating an engineered baffle to the sump of the drain body it creates a siphonic drain which eliminates air from the system and permits smaller pipe diameters to be used. When all air is removed, a negative air pressure in the tail piece of the drain is set up which draws rainwater off the roof siphonically. Though 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 strainer in and around Mobile, Alabama, give us a call. We'd be glad to help.