Roof Drains


There are several different kinds of roof drains and roof drain dome in Anniston, AL and each one is a specific answer to the variety of roof styles and their drainage issues. You need to consider the kind of roof, its size, and its roof pitch to be able to pick the right drain. You also need to think about the site of the drain, how much rainwater is expected and safe practices when selecting a roof water drain for a house or commercial building.

Gable, dormer, mansard and hip roofs shed rainwater water because of gravity. Flat roofs, conversely, accumulate water. Unless this water is directed out and away from the flat roof structure, it will most likely develop pools of water that may inevitably leak and the accumulated weight may eventually cause compromising the integrity of the structure. That is why roofs with a slope of below 2% should have roof drains situated in the lowest areas on the roof where water puddles and should be uniformly spaced all throughout the roof top.

Types of Roof Drains


There are a number of distinct alternatives of roof drains. They basically fall into 2 groups: flat roof drains and pitched roof drains. Pitched roof rainwater drains normally comprise gutters which collect rainwater that passes via gravity down to the roof edge. Gutters transport this water in the direction of downspouts which steer the water flow down and 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 openings are cut into the side of the roof structure so rain water can empty and drain the roof surface. Scuppers can connect to a downspout, or can be extended to make sure that water is directed off of the structure sides and foundation.

Interior Roof Drains


There are many types of inner drains for flat roofs. They are installed at low places on the roof and connect to interior drainage pipes that direct water outdoors or in to a sewer system. Several 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 gravitational force channeling 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 efficient 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 system it produces a siphonic drain which eliminates air from the system and permits smaller sized pipe diameters . When all air is removed, a negative air pressure in the tail portion of the drain is set up which attracts water off the roof siphonically. Though used primarily for flat roofs, siphonic drains can also be installed on angled roofs.

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