Roof Drains


At this time there are several distinct types of roof drains and roof drain downspout in Helena, AL and each is a specific answer to the variety of roof styles and their drainage issues. You must think about the kind of roof, its size, and the roof pitch to be able to pick the right drain. You also need to take into account the site of the drain, how much rainwater is expected and safety when choosing a roof drain for a residence or commercial building.

Hip roofs, dormers, gable and mansard roofs shed water thanks to gravity. Flat roofs, conversely, collect rain water. Until the water is directed out and away from the flat roof structure, it will most likely create pools that could inevitably leak and the accumulated weight will subsequently cause structural damage. That is why roofs with a slope of below two percent ought to have roof drains situated in the lowest places on the roof where water puddles and should be uniformly spaced throughout the roof top.

Kinds of Roof Drains


There are a number of distinct alternatives of roof drains. They generally fall into two groups: flat roof drains and pitched roof drains. Pitched roof drains usually comprise gutters that accumulate rainwater that passes by means of gravity to the roof periphery. Gutters direct this water in the direction of downspouts which steer the water flow down and away from the building or into sewers. Flat roof drains can be one of three primary types: scuppers, inner drains or siphonic drains.

Roof Rainwater Drain Scuppes


Scuppers are situated on the roof's perimeter. They can also be installed on a balcony or terrace. Small openings are cut in the side of the roof structure so rain water can empty and drain the roof surface. Scuppers can hook up to a downspout, or could be extended to make sure that water is guided off of the structure sides and foundation.

Interior Roof Drains


There are quite a few different kinds of inner drains for flat roofs. They are installed at low places on the roof and attach to inner drainage pipes that direct water outdoors or in to a sewer system. Many models of inner roof drains have domes, strainers or covers that keep trash from clogging the roof drain pipe. These kinds of drains work via gravitational force funneling pooling water thru the roof drain system. They can be constructed from PVC, cast iron or cast aluminum.

Siphonic Roof Drains

Siphonic roof drains are a more efficient alternative to gravity drainage. Traditional flat roof drainage allows both air and water to go into the drain system creating pipe space occupied by both air and water. By incorporating an engineered baffle to the sump of the drain system it creates a siphonic drain which removes air from the system and allows for smaller sized pipe diameters . When all air is removed, a negative air pressure in the tail piece of the drain is set up which draws water 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 downspout in and around Helena, Alabama, give us a call. We'd be glad to help.