Roof Drains


At this time there are a few different kinds of roof drains and roof drain system in Piedmont, AL and each one is a specific approach to the variety of roof styles and their drainage challenges. You need to take into consideration the type of roof, its size, and its roof pitch to be able to choose the correct drain. You also need to take into consideration the location of the drain, what amount of rainwater is anticipated and safe practices when selecting a roof water drain for a home or commercial structure.

Hip roofs, dormers, gable and mansard roofs shed water due to gravity. Flat roofs, alternatively, accumulate rain water. Until this water is routed out and away from the flat roof , it will most likely create pools of water that could inevitably leak and the amassed weight may eventually result in compromising the integrity of the structure. That is why roofs with a pitch of under two percent ought to have roof drains positioned at the lowest places on the roof where water puddles and need to be evenly spaced throughout the roof surface.

Kinds of Roof Drains


There are a number of distinct alternatives of roof drains. They generally fall into two categories: pitched roof drains and flat roof drains. Pitched roof drains normally comprise gutters which accumulate rainwater that travels by means of gravity down to the roof edge. Gutters direct this water in the direction of downspouts which steer the water flow down and away from the building or in to sewer lines. Flat roof drains can be one of three primary types: scuppers, inner drains or siphonic drains.

Roof Drain Scuppers


Scuppers are situated on a roof's perimeter. Scuppers can also be put in on a balcony or terrace. Small openings are cut into the side of the roof structure so that water can flow out and drain the roof top. Scuppers can attach to a downspout, or could be lengthened so that water is guided away from the building sides and foundation.

Interior Roof Drains


There are quite a few different types of inner drains for flat roofs. These are installed at low areas on the roof and connect to inner drainage pipes that drive water outside or in to a sewer system. Several designs of inner roof drains have domes, strainers or covers which keep trash from blocking the roof drain pipe. These kinds of drains work via gravity funneling standing 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 effective substitute for gravity drainage. Traditional flat roof drainage allows both air and water to go into the drain system creating 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 that eliminates 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 piece of the drain is established which draws rainwater off the roof siphonically. Though used mainly 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 system in and around Piedmont, Alabama, give us a call. We'd be glad to help.