Roof Drains


At this time there are a few different kinds of roof drains and roof drain scupper in Grand Bay, AL and each is a specific answer to the variety of roof types and their drainage challenges. You must consider the kind of roof, its dimensions, and the roof pitch to be able to pick the correct drain. You also may want to take into account the location of the drain, how much rainwater is anticipated and safety when choosing a roof water drain for a home or commercial structure.

Gable, dormer, mansard and hip roofs shed water thanks to gravity. Flat roofs, on the other hand, collect rain water. Until this water is routed out and away from the flat roof , it will most likely develop pools of water that may inevitably leak and the amassed weight will subsequently cause damage to the structure. That is why roofs with a pitch of below two percent should have roof drains located at the lowest places on the roof where water pools and need to be evenly spaced all throughout the roof top.

Roof Drain Types


There are a number of different variations of roof drains. They basically fall into 2 groups: pitched roof drains and flat roof drains. Pitched roof drains normally comprise gutters which collect rainwater which passes by means of gravity to the roof periphery. Gutters direct this water in the direction of downspouts which route the water flow down and away from the structure or in to sewer lines. Flat roof drains are one of three primary types: scuppers, inner drains or siphonic drains.

Roof Drain Scuppers


Scuppers are situated on a roof's periphery. Scuppers can also be placed on a balcony or terrace. Small openings are cut into the side of the roof structure so rain water can empty and drain the roof top. Scuppers can connect to a downspout, or could be extended to make sure that water is directed off of the building sides and foundation.

Inner Roof Drains


There are many kinds of inner drains for flat roofs. They are installed at low areas on the roof and attach to inner drainage pipes that route water outdoors or in to a sewer system. Many versions of inner roof drains have domes, strainers or covers which prevent trash from clogging the roof drain pipe. These kinds of drains operate via gravitational force channeling 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 effective alternative to gravity drainage. Standard flat roof drainage permits both air and water to enter the drain system creating pipe space occupied by both air and water. By incorporating an engineered baffle to the sump of the drain body it creates a siphonic drain that eliminates air from the system and permits smaller sized pipe diameters . When all of the air is removed, a negative air pressure in the tail piece of the drain is established which attracts rainwater off the roof siphonically. Though used mainly for flat roofs, siphonic drains can also be installed on angled roofs.

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