Roof Drains


At this time there are a few distinct varieties of roof water drains and roof drain cover in Piedmont, AL and each one is an unique solution to the wide range of roof types and their drainage challenges. You must take into consideration the kind of roof, its size, and the roof pitch to be able to pick the most suitable drain. You also may want to take into consideration the site of the drain, how much rainwater is anticipated and safe practices when selecting a roof water drain for a house or business building.

Gambrel, dormers, hip and gable roofs shed water thanks to gravitational force. Flat roofs, conversely, accumulate rain water. Until this water is routed out and away from the flat roof structure, it will develop pools of water that may eventually leak and the amassed weight will subsequently result in damage to the structure. That is why roofs with a pitch of less than 2% should have roof drains situated at the lowest places on the roof in which water puddles and need to be uniformly spread all throughout the roof top.

Kinds of Roof Drains


There are a number of different variations of roof drains. They generally fall into two categories: pitched roof drains and flat roof drains. Pitched roof rainwater drains normally comprise gutters which collect rainwater that travels via gravity down to the roof edge. Gutters channel this water in the direction of downspouts which steer the water flow down and far away from the building or into sewer lines. Flat roof drains can be one of three primary 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 openings are cut in the side of the roof structure so water can flow out and drain the roof surface. Scuppers can hook up to a downspout, or could be lengthened so that water is guided off of the building sides and foundation.

Interior Roof Drains


There are many kinds of inner drains for flat roofs. These are positioned at low spots on the roof and connect to inner drainage pipes that direct water outside or into a sewer system. Several versions of inner roof drains have domes, strainers or covers that keep debris from blocking the roof drain pipe. These kinds of drains work via gravity funneling pooling water through the roof drain system. They can be constructed from PVC, cast iron or cast aluminum.

Siphonic Roof Drains

Siphonic roof drains are a more efficient alternative to gravity drainage. Conventional flat roof drainage permits both air and water to enter the drain system producing pipe space which is occupied by both air and water. By incorporating an engineered baffle to the sump of the drain body it produces a siphonic drain which removes air from the system and allows for smaller sized pipe diameters . When all of the air is removed, 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 set up on pitched roofs.

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