Roof Drains


There are a few distinct varieties of roof water drains and roof drain pvc in Oneonta, AL and each one is a specific solution to the variety of roof styles and their drainage challenges. You must consider the kind of roof, its dimensions, and the roof pitch to be able to pick the right drain. You also need to think about the site of the drain, how much rainwater is anticipated and safety when choosing a roof water drain for a residence or business building.

Gable, dormer, mansard and hip roofs shed water because of gravity. Flat roofs, on the other hand, accumulate rain water. Unless the water is guided out and away from the flat roof structure, it will most likely create pools of water that could eventually leak and the amassed weight will eventually cause structural damage. That is the reason that roofs with a pitch of under two percent should have roof drains positioned in the lowest places 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 alternatives of roof drains. They generally fall into two categories: pitched roof drains and flat roof drains. Pitched roof drains normally comprise gutters which collect rainwater which travels via gravity down 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 the roof's perimeter. They can also be put in on a balcony or terrace. Small openings are cut in the side of the roof structure so that rain water can empty and drain the roof top. Scuppers can attach to a downspout, or could be lengthened so that water is directed away from the structure sides and foundation.

Inner Roof Drains


There are many types of inner drains for flat roofs. These are installed at low areas in the roof and connect to inner drainage pipes that direct water outside or into a sewer system. Several versions of internal roof drains have domes, strainers or covers that keep debris from clogging the roof drain pipe. These kinds of drains operate via gravity channeling standing water thru the roof drain system. They can be constructed from PVC, cast iron or cast aluminum.

Siphonic Roof Drains

Siphonic roof drains are a more effective alternative to gravity drainage. Conventional flat roof drainage allows 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 system it produces a siphonic drain that eliminates air from the system and permits smaller pipe diameters to be used. When all of the air is removed, a negative air pressure in the tail piece of the drain is established which draws water off the roof siphonically. Although used mainly for flat roofs, siphonic drains can also be installed on pitched roofs.

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