Roof Drains


At this time there are a number of distinct kinds of roof drains and roof drain pan in Madison, AL and each one is an unique answer to the variety of roof styles and their drainage concerns. You should consider the type of roof, its size, and its roof pitch to be able to choose the right drain. You also may want to take into consideration the site of the drain, what amount of rainwater is expected and safety when selecting a roof drain for a residence or business structure.

Hip roofs, dormers, gable and mansard roofs shed water because of gravitational force. Flat roofs, conversely, collect water. Until this water is routed out and away from the flat roof , it will develop pools of water that may inevitably leak and the accumulated weight will subsequently result in compromising the integrity of the structure. That is the reason that roofs with a pitch of below 2% should have roof drains situated at the lowest areas on the roof where water pools and need to be evenly spaced all throughout the roof surface.

Kinds of Roof Drains


There are several distinct alternatives of roof drains. They generally fall into 2 categories: pitched roof drains and flat roof drains. Pitched roof rainwater drains normally consist of gutters which accumulate rainwater which passes via gravity to the roof edge. Gutters transport this water towards downspouts which steer the water flow down and far away from the structure or into sewers. Flat roof drains are one of three primary types: scuppers, inner drains or siphonic drains.

Roof Rainwater Drain Scuppes


Scuppers are located on the roof's perimeter. Scuppers can also be placed on a balcony or terrace. Small openings are cut into the side of the roof structure so rain water can flow out and drain the roof top. Scuppers can hook up to a downspout, or could be lengthened so that water is directed off of the building sides and foundation.

Interior Roof Drains


There are many kinds of inner drains for flat roofs. These are installed at low areas on the roof and connect to interior drainage pipes that direct water outside or into a sewer system. Many versions of internal roof drains have domes, strainers or covers that keep trash from obstructing the roof drain pipe. These types of drains work via gravitational force funneling standing 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 effective substitute for gravity drainage. Traditional flat roof drainage permits both air and water to enter 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 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 draws water off the roof siphonically. Although used mainly for flat roofs, siphonic drains can also be installed on angled roofs.

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