Roof Drains


At this time there are a few distinct kinds of roof drains and roof drain pvc in Opelika, AL and each is a specific approach to the wide range of roof types and their drainage challenges. You must consider the type of roof, its dimensions, and its roof pitch to be able to select the right drain. You also should think about the location of the drain, how much rainwater is expected and safety when selecting a roof water drain for a home or commercial structure.

Hip roofs, dormers, gable and mansard roofs shed water due to gravitational force. Flat roofs, on the other hand, accumulate rain water. Until this water is guided out and away from the roof , it will create pools that may inevitably leak and the amassed weight will subsequently cause damage to the structure. That is why roofs with a pitch of below 2% ought to have roof drains positioned at the lowest areas on the roof where water puddles and need to be uniformly spaced throughout the roof top.

Types of Roof Drains


There are a number of different alternatives of roof drains. They basically fall into 2 groups: pitched roof drains and flat roof drains. Pitched roof rainwater drains usually comprise gutters which accumulate rainwater which passes by means of gravity to the roof edge. Gutters transport this water in the direction of downspouts which steer the water flow down and far away from the structure or into sewers. Flat roof drains are one of three main types: scuppers, inner drains or siphonic drains.

Roof Drain Scuppers


Scuppers are located on a roof's periphery. Scuppers can also be installed 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 can be lengthened so that water is directed away from the structure sides and foundation.

Interior Roof Drains


There are many types of inner drains for flat roofs. They are positioned at low areas on the roof and connect to interior drainage pipes that drive water outdoors or into a sewer system. Many styles of internal roof drains have domes, strainers or covers which prevent trash from clogging the roof drain pipe. These types of drains work via gravity 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 efficient alternative to gravity drainage. Standard flat roof drainage allows both air and water to go into the drain system producing pipe space occupied by both air and water. By incorporating an engineered baffle to the sump of the drain system it produces a siphonic drain which removes air from the system and permits 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. Although 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 pvc in and around Opelika, Alabama, give us a call. We'd be glad to help.