Roof Drains


There are several different kinds of roof water drains and roof drain pipe in Northport, AL and each is an unique solution to the variety of roof styles and their drainage issues. You must consider the type of roof, its dimensions, and the roof pitch to be able to pick the correct drain. You also may want to take into consideration the location of the drain, what amount of rainwater is expected and safe practices when selecting a roof water drain for a home or commercial structure.

Gambrel, dormers, hip and gable roofs shed rainwater water thanks to gravitational force. Flat roofs, on the other hand, accumulate water. Unless the water is guided out and away from the roof , it will most likely create pools of water that may inevitably leak and the accumulated weight will subsequently result in compromising the integrity of the structure. That is the reason that roofs with a pitch of under two percent should have roof drains situated at the lowest areas on the roof where water pools and should be uniformly spaced throughout the roof top.

Roof Drain Types


There are a number of distinct alternatives of roof drains. They generally fall into two groups: pitched roof drains and flat roof drains. Pitched roof rainwater drains usually consist of gutters which accumulate rainwater that passes via gravity down to the roof edge. Gutters direct this water towards downspouts which direct the water flow down and far away from the structure or into sewer lines. Flat roof drains are one of three primary types: scuppers, inner drains or siphonic drains.

Roof Rainwater Drain Scuppes


Scuppers are situated on a roof's periphery. Scuppers can also be placed on a balcony or terrace. Small holes are cut into the side of the roof structure so that water can flow out and drain the roof top. Scuppers can hook up to a downspout, or could be extended so that water is directed off of the structure sides and foundation.

Interior Roof Drains


There are many types of inner drains for flat roofs. They are positioned at low spots on the roof and attach to interior drainage pipes that direct water outdoors or into a sewer system. Many versions of internal roof drains have domes, strainers or covers that prevent trash from obstructing the roof drain pipe. These types of drains work via gravity funneling standing 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 efficient alternative to 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 adding 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 pipe diameters . When all of the air is eliminated, 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 set up on angled roofs.

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