Roof Drains


At this time there are a number of distinct types of roof water drains and roof drain pipe in Gardendale, AL and each is an unique answer to the variety of roof styles and their drainage challenges. You must take into consideration the type of roof, its size, and its 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 anticipated and safe practices when selecting a roof drain for a residence or commercial structure.

Hip roofs, dormers, gable and mansard roofs shed rainwater water thanks to gravity. Flat roofs, conversely, accumulate rain water. Unless this water is routed out and away from the flat roof structure, it will create pools that may inevitably leak and the amassed weight may subsequently cause damage to the structure. That is why roofs with a pitch of under 2% should have roof drains located at the lowest spots on the roof where water puddles and should be uniformly spaced throughout the roof top.

Roof Drain Kinds


There are several distinct variations of roof drains. They basically fall into two categories: flat roof drains and pitched roof drains. Pitched roof rainwater drains usually consist of gutters that accumulate rainwater which travels by means of gravity down to the roof periphery. Gutters transport this water towards downspouts which steer the water flow down and far away from the building or into sewer lines. Flat roof drains can be one of three main types: scuppers, inner drains or siphonic drains.

Roof Drain Scuppers


Scuppers are situated on the roof's periphery. Scuppers can also be installed on a balcony or terrace. Small openings are cut into the side of the roof structure so rain water can flow out and drain the roof top. Scuppers can attach to a downspout, or can be extended to make sure that water is guided away from the building sides and foundation.

Inner Roof Drains


There are quite a few different kinds of inner drains for flat roofs. These are installed at low spots on the roof and attach to inner drainage pipes that direct water outside or into a sewer system. Several versions of internal roof drains have domes, strainers or covers that prevent debris from blocking the roof drain pipe. These kinds of drains work via gravitational force channeling standing water through the roof drain system. They can be made from PVC, cast iron or cast aluminum.

Siphonic Roof Drains

Siphonic roof drains are a more effective substitute for gravity drainage. Traditional flat roof drainage permits both air and water to enter the drain system creating pipe space which is occupied by both air and water. By incorporating an engineered baffle to the sump of the drain body it produces a siphonic drain that removes air from the system and allows for smaller sized pipe diameters to be used. When all of the air is removed, a negative air pressure in the tail piece of the drain is established which draws water off the roof siphonically. Though used mainly for flat roofs, siphonic drains can also be set up on pitched roofs.

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