Roof Drains


There are a number of different types of roof water drains and roof drain pan in Jacksonville, AL and each one is an unique solution to the wide range of roof types and their drainage challenges. You must consider the type of roof, its dimensions, and the roof pitch to be able to pick the correct drain. You also should think about the location of the drain, what amount of rainwater is expected and safe practices when selecting a roof water drain for a house or business structure.

Gambrel, dormers, hip and gable roofs shed water because of gravity. Flat roofs, alternatively, accumulate water. Until this water is directed out and away from the roof structure, it will develop pools of water that may eventually leak and the accumulated weight may eventually result in structural damage. That is the reason that roofs with a slope of below 2% should have roof drains located at the lowest spots on the roof where water puddles and need to be uniformly spaced throughout the roof surface.

Roof Drain Kinds


There are several distinct variations of roof drains. They basically fall into two categories: pitched roof drains and flat roof drains. Pitched roof drains usually consist of gutters that collect rainwater that passes via gravity down to the roof periphery. Gutters channel this water towards downspouts which steer 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 a roof's perimeter. They can also be installed on a balcony or terrace. Small holes are cut in the side of the roof structure so water can empty and drain the roof surface. Scuppers can hook up to a downspout, or can be lengthened to make sure that water is directed off of the structure sides and foundation.

Inner Roof Drains


There are quite a few different kinds of inner drains for flat roofs. These are positioned at low places in the roof and attach to interior drainage pipes that route water outside or in to a sewer system. Many designs of inner roof drains have domes, strainers or covers that keep trash from blocking the roof drain pipe. These types of drains work via gravitational force channeling standing water thru the roof drain system. They are made of PVC, cast iron or cast aluminum.

Siphonic Roof Drains

Siphonic roof drains are a more efficient substitute for gravity drainage. Traditional 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 eliminates air from the system and permits smaller sized 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 pulls water off the roof siphonically. Although used primarily 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 pan in and around Jacksonville, Alabama, give us a call. We'd be glad to help.