Roof Drains


At this time there are a few different kinds of roof drains and roof drain pan in Fairfield, AL and each is an unique approach to the variety of roof types and their drainage issues. You need to consider the kind of roof, its dimensions, and the roof pitch to be able to pick the right drain. You also need to take into consideration the site of the drain, what amount of rainwater is expected and safe practices when choosing a roof drain for a home or business structure.

Gambrel, dormers, hip and gable roofs shed rainwater water because of gravity. Flat roofs, conversely, collect rain water. Until this water is directed out and away from the roof structure, it will most likely create pools that may inevitably leak and the amassed weight will subsequently result in damage to the structure. That is the reason that roofs with a pitch of less than 2% should have roof drains located in the lowest places on the roof where water puddles and need to be uniformly spaced throughout the roof surface.

Types of Roof Drains


There are a number of distinct alternatives of roof drains. They generally fall into 2 categories: pitched roof drains and flat roof drains. Pitched roof drains usually comprise gutters that collect rainwater that travels by means of gravity to the roof edge. Gutters direct this water towards downspouts which direct the water flow down and away from the structure or into sewer lines. Flat roof drains are one of three primary types: scuppers, inner drains or siphonic drains.

Roof Drain Scuppers


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

Inner Roof Drains


There are quite a few different kinds of inner drains for flat roofs. These are installed at low areas in the roof and connect to inner drainage pipes that route water outdoors or in to a sewer system. Several styles of internal roof drains have domes, strainers or covers which keep trash from blocking the roof drain pipe. These types of drains work via gravitational force channeling standing water through the roof drain system. They can be made from PVC, cast iron or cast aluminum.

Siphonic Roof Drains

Siphonic roof drains are a more effective alternative to gravity drainage. Traditional flat roof drainage permits both air and water to go into the drain system creating pipe space 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 permits smaller sized pipe diameters . When all of the air is removed, a negative air pressure in the tail piece of the drain is set up which pulls rainwater off the roof siphonically. Though used mainly for flat roofs, siphonic drains can also be installed on pitched roofs.

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