Roof Drains


At this time there are several distinct varieties of roof drains and roof drain system in Alabaster, AL and each one is a specific approach to the wide range of roof styles and their drainage concerns. You should think about the kind of roof, its size, and the roof pitch to be able to choose the most suitable drain. You also need to take into consideration the location of the drain, what amount of rainwater is expected and safe practices when selecting a roof drain for a home or commercial structure.

Gable, dormer, mansard and hip roofs shed water thanks to gravitational force. Flat roofs, on the other hand, collect water. Until the water is routed out and away from the roof , it will most likely develop pools that may inevitably leak and the amassed weight will eventually cause structural damage. That is the reason that roofs with a pitch of below 2% should have roof drains positioned in the lowest areas on the roof where water puddles and need to be uniformly spaced throughout the roof surface.

Roof Drain Kinds


There are a number of different variations of roof drains. They basically fall into two groups: pitched roof drains and flat roof drains. Pitched roof drains usually consist of gutters which collect rainwater which passes by means of gravity to the roof edge. Gutters transport this water in the direction of downspouts which direct the water flow down and far away from the structure or in to 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. They can also be installed on a balcony or terrace. Small openings are cut in the side of the roof structure so water can flow out and drain the roof top. Scuppers can attach to a downspout, or can be extended so that water is directed off of the structure sides and foundation.

Inner Roof Drains


There are many types of inner drains for flat roofs. They are positioned at low places in the roof and connect to inner drainage pipes that direct water outside or into a sewer system. Many designs of internal roof drains have domes, strainers or covers that keep trash from clogging the roof drain pipe. These types of drains work via gravitational force funneling pooling water through the roof drain system. They are constructed from PVC, cast iron or cast aluminum.

Siphonic Roof Drains

Siphonic roof drains are a more efficient alternative to gravity drainage. Traditional 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 allows for smaller sized pipe diameters to be used. When all air is eliminated, a negative air pressure in the tail portion of the drain is set up which draws water off the roof siphonically. Although 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 system in and around Alabaster, Alabama, give us a call. We'd be glad to help.