Roof Drains


At this time there are several distinct varieties of roof water drains and roof drain system in Florence, AL and each is an unique solution to the variety of roof types and their drainage issues. You must look at the type of roof, its dimensions, and the roof pitch to be able to pick the correct drain. You also should take into account the site of the drain, how much rainwater is anticipated and safety when selecting a roof water drain for a residence or business building.

Gambrel, dormers, hip and gable roofs shed water due to gravity. Flat roofs, alternatively, collect rain water. Until the water is directed out and away from the flat roof structure, it will develop pools that could eventually leak and the accumulated weight will subsequently cause structural damage. That is why roofs with a pitch of less than two percent should have roof drains positioned at the lowest spots on the roof where water puddles and need to be evenly spaced throughout the roof top.

Types of Roof Drains


There are a number of distinct alternatives of roof drains. They generally 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 down to the roof periphery. Gutters transport this water towards downspouts which steer the water flow down and far away from the structure or into 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 the roof's perimeter. Scuppers can also be placed on a balcony or terrace. Small openings are cut in the side of the roof structure so water can flow out and drain the roof surface. Scuppers can attach to a downspout, or can be extended to make sure that water is directed off of the structure sides and foundation.

Interior Roof Drains


There are many types of inner drains for flat roofs. These are installed at low places on the roof and attach to inner drainage pipes that route water outdoors or in to a sewer system. Many versions of internal roof drains have domes, strainers or covers which keep trash from obstructing the roof drain pipe. These kinds of drains work via gravity channeling pooling water thru the roof drain system. They can be made from PVC, cast iron or cast aluminum.

Siphonic Roof Drains

Siphonic roof drains are a more effective substitute for gravity drainage. Conventional flat roof drainage allows both air and water to go into the drain system creating pipe space which is occupied by both air and water. By incorporating an engineered baffle to the sump of the drain body it creates a siphonic drain that removes air from the system and allows for smaller sized pipe diameters . When all air is removed, a negative air pressure in the tail portion of the drain is set up which attracts water 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 system in and around Florence, Alabama, give us a call. We'd be glad to help.