Roof Drains


There are a few different types of roof drains and roof drain pan in Huntsville, AL and each one is an unique solution to the variety of roof types and their drainage challenges. You must look at the kind of roof, its dimensions, and its roof pitch to be able to select the most suitable drain. You also may want to think about the location of the drain, what amount of rainwater is expected and safety when selecting a roof drain for a home or commercial building.

Gambrel, dormers, hip and gable roofs shed rainwater water thanks to gravity. Flat roofs, conversely, collect water. Unless the water is directed out and away from the flat roof structure, it will most likely create pools that could inevitably leak and the amassed weight may subsequently cause damage to the structure. That is the reason that roofs with a slope of less than two percent ought to have roof drains located at the lowest places on the roof in which water pools and need to be evenly spaced throughout the roof surface.

Roof Drain Types


There are several different variations of roof drains. They generally fall into two groups: pitched roof drains and flat roof drains. Pitched roof drains usually comprise gutters that collect rainwater which travels via gravity to the roof periphery. Gutters direct this water in the direction of downspouts which steer the water flow down and far away from the building 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 located on a roof's periphery. They can also be installed on a balcony or terrace. Small holes are cut in the side of the roof structure so that rain water can flow out and drain the roof surface. Scuppers can hook up to a downspout, or could be lengthened to make sure that water is directed 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 positioned at low spots on the roof and attach to inner drainage pipes that drive water outside or in to a sewer system. Several models of internal roof drains have domes, strainers or covers which keep trash from clogging the roof drain pipe. These kinds of drains work via gravity funneling pooling 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. Standard flat roof drainage allows both air and water to enter the drain system creating pipe space occupied by both air and water. By adding an engineered baffle to the sump of the drain system it produces a siphonic drain that removes air from the system and allows for smaller sized pipe diameters to be used. When all air is removed, a negative air pressure in the tail piece of the drain is set up which attracts 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 pan in and around Huntsville, Alabama, give us a call. We'd be glad to help.