Roof Drains


At this time there are a number of distinct varieties of roof water drains and roof drain pipe in Huntsville, AL and each one is an unique approach to the wide range of roof types and their drainage challenges. You need to think about the type of roof, its size, and the roof pitch to be able to select the most suitable drain. You also need to take into account the site of the drain, what amount of rainwater is expected and safe practices when selecting a roof water drain for a house or business structure.

Gable, dormer, mansard and hip roofs shed water thanks to gravitational force. Flat roofs, on the other hand, collect rain water. Unless the water is routed out and away from the roof structure, it will create pools of water that may inevitably leak and the accumulated weight may eventually cause structural damage. That is the reason that roofs with a pitch of below 2% ought to have roof drains situated in the lowest places on the roof where water puddles and need to be evenly spread all throughout the roof surface.

Types of Roof Drains


There are several distinct variations of roof drains. They generally fall into two categories: pitched roof drains and flat roof drains. Pitched roof drains normally comprise gutters that collect rainwater which passes by means of gravity to the roof edge. Gutters transport this water in the direction of downspouts which route the water flow down and away from the structure or in to sewer lines. Flat roof drains are one of three main types: scuppers, inner drains or siphonic drains.

Roof Drain Scuppers


Scuppers are located on the roof's periphery. They can also be installed on a balcony or terrace. Small openings are cut in the side of the roof structure so that rain water can flow out and drain the roof top. Scuppers can hook up to a downspout, or can be extended to make sure that water is guided away from the structure sides and foundation.

Interior Roof Drains


There are many types of inner drains for flat roofs. These are positioned at low places on the roof and connect to inner drainage pipes that route water outdoors or into a sewer system. Many models of inner roof drains have domes, strainers or covers which prevent debris from clogging the roof drain pipe. These kinds of drains work via gravity channeling 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 efficient substitute for gravity drainage. Standard flat roof drainage allows both air and water to go into 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 removes air from the system and permits smaller sized pipe diameters . When all of the air is eliminated, a negative air pressure in the tail portion of the drain is set up which pulls rainwater off the roof siphonically. Though used primarily 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 pipe in and around Huntsville, Alabama, give us a call. We'd be glad to help.