Roof Drains


At this time there are several different varieties of roof water drains and roof drain downspout in Montgomery, AL and each is an unique solution to the wide range of roof styles and their drainage challenges. You should look at the type of roof, its dimensions, and its roof pitch to be able to choose the correct drain. You also should take into account the location of the drain, what amount of rainwater is expected and safe practices when choosing a roof water drain for a residence or commercial structure.

Hip roofs, dormers, gable and mansard roofs shed rainwater water because of gravitational force. Flat roofs, conversely, accumulate water. Until the water is routed out and away from the roof , it will develop pools of water that may eventually leak and the accumulated weight may subsequently result in damage to the structure. That is the reason that roofs with a pitch of below 2% should have roof drains situated in the lowest places on the roof in which water pools and need to be evenly spread all throughout the roof surface.

Roof Drain Kinds


There are several distinct variations of roof drains. They basically fall into two groups: flat roof drains and pitched roof drains. Pitched roof drains usually comprise gutters that collect rainwater which passes by means of gravity down to the roof edge. Gutters direct 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 primary types: scuppers, inner drains or siphonic drains.

Roof Drain Scuppers


Scuppers are located on the roof's periphery. They can also be placed on a balcony or terrace. Small openings are cut into the side of the roof structure so water can flow out 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.

Interior Roof Drains


There are many kinds of inner drains for flat roofs. These are positioned at low places in the roof and attach to interior drainage pipes that drive water outdoors or in to a sewer system. Several models of internal roof drains have domes, strainers or covers which keep debris from blocking the roof drain pipe. These kinds of drains work via gravitational force funneling pooling water through the roof drain system. They are made of PVC, cast iron or cast aluminum.

Siphonic Roof Drains

Siphonic roof drains are a more efficient substitute for gravity drainage. Standard flat roof drainage permits both air and water to enter the drain system producing pipe space occupied by both air and water. By incorporating an engineered baffle to the sump of the drain body it produces a siphonic drain which eliminates air from the system and permits smaller sized pipe diameters . When all air is eliminated, a negative air pressure in the tail portion of the drain is established which attracts rainwater off the roof siphonically. Although used primarily 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 downspout in and around Montgomery, Alabama, give us a call. We'd be glad to help.