There are a number of different varieties of roof water drains and roof drain cover in Gadsden, AL and each is a specific solution to the variety of roof styles and their drainage issues. You need to look at the type of roof, its size, and the roof pitch to be able to select the right drain. You also should take into account the site of the drain, what amount of rainwater is anticipated and safe practices when selecting a roof water drain for a house or business building. Gambrel, dormers, hip and gable roofs shed water because of gravity. Flat roofs, on the other hand, accumulate rain water. Until the water is guided out and away from the flat roof , it will develop pools that may inevitably leak and the amassed weight may eventually cause damage to the structure. That is why roofs with a pitch of below two percent should have roof drains located in the lowest places on the roof in which water puddles and need to be evenly spread all throughout the roof surface.
Roof Drain Kinds
There are a number of different alternatives of roof drains. They generally fall into two categories: pitched roof drains and flat roof drains. Pitched roof drains usually comprise gutters that collect rainwater that travels by means of gravity down to the roof edge. Gutters direct this water towards downspouts which direct the water flow down and far away from the structure or into sewer lines. Flat roof drains are 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 into the side of the roof structure so that water can flow out and drain the roof surface. Scuppers can attach to a downspout, or could be extended to make sure that water is guided away from the building sides and foundation.
Interior Roof Drains
There are many types of inner drains for flat roofs. They are installed at low places on the roof and connect to inner drainage pipes that direct water outdoors or into a sewer system. Many models of inner roof drains have domes, strainers or covers which keep debris from obstructing the roof drain pipe. These types of drains work via gravitational force channeling standing water through the roof drain system. They can be made of PVC, cast iron or cast aluminum.
Siphonic Roof DrainsSiphonic roof drains are a more effective substitute for gravity drainage. Standard flat roof drainage permits both air and water to go into the drain system producing pipe space which is 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 permits smaller pipe diameters to be used. When all air is removed, a negative air pressure in the tail portion of the drain is established 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 cover in and around Gadsden, Alabama, give us a call. We'd be glad to help.