Roof Drains


At this time there are several different kinds of roof drains and roof drain system in Killen, AL and each is an unique answer to the variety of roof types and their drainage concerns. You need to consider the type of roof, its size, and the roof pitch to be able to choose the most suitable drain. You also should take into account the location of the drain, how much rainwater is expected and safe practices when selecting a roof drain for a home or business building.

Gambrel, dormers, hip and gable roofs shed rainwater water because of gravitational force. Flat roofs, conversely, collect water. Unless the water is routed out and away from the flat roof , it will develop pools that may eventually leak and the accumulated weight will eventually cause damage to the structure. That is why roofs with a pitch of below two percent ought to have roof drains situated in the lowest places on the roof in which water puddles and should be uniformly spaced all throughout the roof top.

Roof Drain Types


There are a number of different alternatives of roof drains. They basically fall into 2 categories: pitched roof drains and flat roof drains. Pitched roof rainwater drains normally consist of gutters that collect rainwater that travels by means of gravity down to the roof periphery. Gutters transport this water towards downspouts which route the water flow down and away from the structure or in to 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. Scuppers can also be installed on a balcony or terrace. Small openings are cut into the side of the roof structure so water can empty and drain the roof surface. Scuppers can attach to a downspout, or could be lengthened to make sure that water is guided away from the building sides and foundation.

Inner Roof Drains


There are many types of inner drains for flat roofs. They are positioned at low spots on the roof and connect to inner drainage pipes that drive water outside or into a sewer system. Several designs of internal roof drains have domes, strainers or covers which prevent trash from obstructing the roof drain pipe. These kinds of drains operate via gravity channeling standing water through 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 alternative to gravity drainage. Traditional flat roof drainage allows both air and water to enter the drain system producing 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 that removes air from the system and permits smaller sized pipe diameters to be used. When all of the air is eliminated, a negative air pressure in the tail portion of the drain is established which draws water 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 system in and around Killen, Alabama, give us a call. We'd be glad to help.