Roof Drains


At this time there are a number of different types of roof water drains and roof drain downspout in Piedmont, AL and each one is an unique answer to the variety of roof styles and their drainage challenges. You should consider the type of roof, its dimensions, and its roof pitch to be able to pick the most suitable drain. You also need to take into consideration the site of the drain, how much rainwater is expected and safe practices when choosing a roof drain for a home or commercial building.

Gambrel, dormers, hip and gable roofs shed water because of gravitational force. Flat roofs, conversely, accumulate water. Unless this water is directed out and away from the flat roof , it will most likely develop pools of water that could eventually leak and the accumulated weight will subsequently cause structural damage. That is why roofs with a slope of under 2% should have roof drains located in the lowest areas on the roof in which water puddles and should be uniformly spaced throughout the roof surface.

Types of Roof Drains


There are a number of distinct alternatives of roof drains. They basically fall into two categories: pitched roof drains and flat roof drains. Pitched roof drains normally consist of gutters which collect rainwater which passes via gravity to the roof periphery. Gutters direct this water in the direction of downspouts which route 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 perimeter. Scuppers can also be put in on a balcony or terrace. Small openings are cut into the side of the roof structure so rain water can flow out and drain the roof surface. Scuppers can hook up to a downspout, or could be extended so that water is guided off of the structure sides and foundation.

Interior Roof Drains


There are many types of inner drains for flat roofs. These are positioned at low spots in the roof and connect to interior drainage pipes that drive water outside or into a sewer system. Several styles of internal roof drains have domes, strainers or covers that keep debris from obstructing the roof drain pipe. These types of drains operate via gravity 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 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 that eliminates air from the system and permits smaller pipe diameters . When all air is removed, a negative air pressure in the tail piece of the drain is established which pulls rainwater off the roof siphonically. Though used primarily for flat roofs, siphonic drains can also be installed on angled roofs.

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