Roof Drains


At this time there are a few different varieties of roof drains and roof drain pvc in Athens, AL and each is a specific answer to the wide range of roof styles and their drainage issues. You need to consider the kind of roof, its dimensions, and the roof pitch to be able to select the most suitable drain. You also may want to take into consideration the site of the drain, what amount of rainwater is expected and safe practices when choosing a roof drain for a home or business building.

Hip roofs, dormers, gable and mansard roofs shed rainwater water thanks to gravity. Flat roofs, on the other hand, accumulate water. Until this water is routed out and away from the flat roof , it will create pools of water that may inevitably leak and the amassed weight will subsequently result in compromising the integrity of the structure. That is why roofs with a pitch of below two percent ought to have roof drains positioned in the lowest areas on the roof in which water pools and need to be uniformly spread throughout the roof top.

Types of Roof Drains


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 usually consist of gutters that collect rainwater which passes via gravity down to the roof periphery. Gutters direct this water towards downspouts which direct 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 the roof's perimeter. 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 surface. Scuppers can connect to a downspout, or can be lengthened to make sure that water is guided off of the structure sides and foundation.

Interior Roof Drains


There are many kinds of inner drains for flat roofs. They are positioned at low areas on the roof and connect to inner drainage pipes that route water outdoors or in to a sewer system. Many models of inner roof drains have domes, strainers or covers that keep trash from clogging the roof drain pipe. These kinds of drains work via gravitational force funneling standing water through the roof drain system. They can be made of PVC, cast iron or cast aluminum.

Siphonic Roof Drains

Siphonic roof drains are a more efficient substitute for gravity drainage. Traditional flat roof drainage allows both air and water to enter the drain system creating pipe space which is occupied by both air and water. By adding an engineered baffle to the sump of the drain body it creates a siphonic drain that removes air from the system and allows for smaller 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 attracts water off the roof siphonically. Although used mainly for flat roofs, siphonic drains can also be set up on pitched roofs.

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