Roof Drains


At this time there are a number of distinct types of roof drains and roof drain cover in Helena, AL and each is a specific solution to the wide range of roof types and their drainage concerns. You must look at the kind of roof, its dimensions, and the roof pitch to be able to choose the right drain. You also should take into account the location of the drain, how much rainwater is expected and safety when choosing a roof drain for a home or business building.

Gambrel, dormers, hip and gable roofs shed rainwater water thanks to gravitational force. Flat roofs, conversely, collect water. Until the water is guided out and away from the roof , it will develop pools that may inevitably leak and the accumulated weight will subsequently cause damage to the structure. That is the reason that roofs with a pitch of under 2% ought to have roof drains positioned at the lowest places on the roof where water puddles and need to be uniformly spread throughout the roof top.

Types of Roof Drains


There are several different variations of roof drains. They basically fall into 2 groups: flat roof drains and pitched roof drains. Pitched roof rainwater drains normally comprise gutters that accumulate rainwater which passes by means of gravity to the roof periphery. Gutters transport 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 Drain Scuppers


Scuppers are located on the roof's periphery. They can also be installed on a balcony or terrace. Small openings are cut in the side of the roof structure so that water can empty and drain the roof top. Scuppers can connect to a downspout, or can be lengthened so that water is directed 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 places in the roof and attach to inner drainage pipes that drive water outside or into a sewer system. Several designs of internal roof drains have domes, strainers or covers that prevent trash from blocking the roof drain pipe. These kinds of drains operate via gravity channeling pooling water thru the roof drain system. They are made from PVC, cast iron or cast aluminum.

Siphonic Roof Drains

Siphonic roof drains are a more effective alternative to gravity drainage. Conventional flat roof drainage permits both air and water to enter 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 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 pulls rainwater off the roof siphonically. Though used mainly for flat roofs, siphonic drains can also be set up on angled roofs.

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