Roof Drains


There are a few different varieties of roof drains and roof drain pipe in Prattville, AL and each is a specific solution to the variety of roof types and their drainage concerns. You should consider the kind of roof, its size, and the roof pitch to be able to select the correct drain. You also should take into account the site of the drain, how much rainwater is anticipated and safe practices when selecting a roof drain for a home or commercial structure.

Gambrel, dormers, hip and gable roofs shed water thanks to gravitational force. Flat roofs, on the other hand, accumulate rain water. Unless this water is guided out and away from the flat roof , it will develop pools that could inevitably leak and the accumulated weight will subsequently result in damage to the structure. That is why roofs with a slope of less than 2% should have roof drains located at the lowest places on the roof in which water pools and need to be uniformly spaced throughout the roof top.

Types of Roof Drains


There are several different alternatives of roof drains. They generally fall into 2 categories: pitched roof drains and flat roof drains. Pitched roof drains usually comprise gutters which collect rainwater that travels via gravity down to the roof periphery. Gutters direct this water in the direction of downspouts which direct the water flow down and away from the structure 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 located on the 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 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 building sides and foundation.

Interior Roof Drains


There are many kinds of inner drains for flat roofs. They are positioned at low places on the roof and attach to interior drainage pipes that route water outdoors or in to a sewer system. Several models of internal roof drains have domes, strainers or covers that prevent trash from blocking the roof drain pipe. These kinds of drains operate via gravitational force funneling standing water thru the roof drain system. They are constructed from PVC, cast iron or cast aluminum.

Siphonic Roof Drains

Siphonic roof drains are a more efficient alternative to gravity drainage. Standard flat roof drainage permits 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 which removes air from the system and allows for 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 attracts water 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 pipe in and around Prattville, Alabama, give us a call. We'd be glad to help.