Roof Drains


There are several different kinds of roof drains and roof drain pan in Athens, AL and each one is an unique approach to the wide range of roof types and their drainage challenges. You must consider the kind of roof, its dimensions, and the roof pitch to be able to choose the most suitable drain. You also should take into consideration the site of the drain, how much rainwater is anticipated and safety when selecting a roof drain for a home or business building.

Hip roofs, dormers, gable and mansard roofs shed water because of gravitational force. Flat roofs, conversely, collect rain water. Unless this water is directed out and away from the flat roof structure, it will create pools of water that may eventually leak and the accumulated weight may subsequently result in compromising the integrity of the structure. That is the reason that roofs with a slope of under two percent ought to have roof drains situated at the lowest places on the roof in which water pools and should be evenly spread throughout the roof surface.

Roof Drain Types


There are several different alternatives of roof drains. They generally fall into two categories: flat roof drains and pitched roof drains. Pitched roof drains usually comprise gutters which collect rainwater that passes by means of gravity down to the roof periphery. Gutters direct this water in the direction of downspouts which steer the water flow down and far away from the structure or in to sewer lines. Flat roof drains can be one of three primary types: scuppers, inner drains or siphonic drains.

Roof Rainwater Drain Scuppes


Scuppers are located on the roof's perimeter. They can also be put in on a balcony or terrace. Small holes are cut into the side of the roof structure so rain water can empty and drain the roof top. Scuppers can attach to a downspout, or could be extended so that water is directed away from the building sides and foundation.

Inner Roof Drains


There are many kinds of inner drains for flat roofs. These are installed at low spots in the roof and attach to inner drainage pipes that drive water outdoors or in to a sewer system. Several styles of internal roof drains have domes, strainers or covers which prevent trash from obstructing the roof drain pipe. These kinds of drains work via gravity channeling standing water thru the roof drain system. They are constructed from 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 go into the drain system producing pipe space occupied by both air and water. By adding an engineered baffle to the sump of the drain system it produces a siphonic drain which removes air from the system and permits smaller sized pipe diameters . When all of the air is removed, a negative air pressure in the tail portion of the drain is set up which pulls rainwater 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 pan in and around Athens, Alabama, give us a call. We'd be glad to help.