Roof Drains


At this time there are several different varieties of roof drains and roof drain pan in Harvest, AL and each one is a specific answer to the variety of roof styles and their drainage issues. You should think about the kind of roof, its dimensions, and its roof pitch to be able to select the right drain. You also may want to take into consideration the location of the drain, how much rainwater is expected and safe practices when choosing a roof drain for a home or commercial structure.

Gable, dormer, mansard and hip roofs shed water thanks to gravity. Flat roofs, conversely, collect water. Until this water is routed out and away from the flat roof structure, it will develop pools that could inevitably leak and the amassed weight will eventually result in compromising the integrity of the structure. That is the reason that roofs with a pitch of below 2% ought to have roof drains positioned in the lowest places on the roof in which water pools and should be evenly spaced throughout the roof top.

Roof Drain Kinds


There are several distinct variations of roof drains. They basically fall into two groups: flat roof drains and pitched roof drains. Pitched roof rainwater drains usually comprise gutters that accumulate rainwater which passes via gravity to the roof periphery. Gutters channel this water towards downspouts which steer the water flow down and away from the structure or in to 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. They can also be placed on a balcony or terrace. Small holes are cut into the side of the roof structure so that water can empty and drain the roof surface. Scuppers can attach to a downspout, or can be lengthened so that water is guided away from the structure sides and foundation.

Interior Roof Drains


There are many types of inner drains for flat roofs. These are installed at low areas in the roof and connect to interior drainage pipes that direct water outdoors or into a sewer system. Several styles of inner roof drains have domes, strainers or covers which prevent trash from obstructing the roof drain pipe. These kinds of drains work via gravitational force funneling pooling 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 efficient substitute for gravity drainage. Traditional flat roof drainage allows both air and water to enter the drain system creating pipe space which is occupied by both air and water. By adding an engineered baffle to the sump of the drain system it creates a siphonic drain that eliminates air from the system and allows for smaller sized pipe diameters . When all of the air is removed, a negative air pressure in the tail portion of the drain is established which attracts rainwater off the roof siphonically. Although used primarily 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 Harvest, Alabama, give us a call. We'd be glad to help.