There are a number of distinct varieties of roof water drains and roof drain cover in Pinson, AL and each one is an unique approach to the wide range of roof types and their drainage issues. You need to look at the kind of roof, its size, and the roof pitch to be able to pick the correct drain. You also should take into account the location of the drain, what amount of rainwater is anticipated and safe practices when selecting a roof drain for a residence or business building. Gambrel, dormers, hip and gable roofs shed rainwater water because of gravity. Flat roofs, conversely, accumulate rain water. Until this water is routed out and away from the flat roof structure, it will develop pools of water that could inevitably leak and the accumulated weight will subsequently result in structural damage. That is why roofs with a pitch of below two percent should have roof drains positioned in the lowest places on the roof where water puddles and need to be uniformly spaced all throughout the roof surface.
Roof Drain Kinds
There are several distinct variations of roof drains. They generally fall into 2 groups: flat roof drains and pitched roof drains. Pitched roof rainwater drains normally comprise gutters which collect rainwater which travels by means of gravity down to the roof edge. Gutters transport this water in the direction of downspouts which steer the water flow down and away from the structure or into sewer lines. Flat roof drains can be one of three primary types: scuppers, inner drains or siphonic drains.
Roof Drain Scuppers
Scuppers are located on a roof's perimeter. They can also be installed on a balcony or terrace. Small openings are cut into the side of the roof structure so that rain water can empty and drain the roof top. Scuppers can hook up to a downspout, or can be lengthened to make sure that water is guided off of the building sides and foundation.
Interior Roof Drains
There are quite a few different types of inner drains for flat roofs. They are installed at low areas in the roof and connect to inner drainage pipes that direct water outdoors or in to a sewer system. Many designs of inner roof drains have domes, strainers or covers that prevent trash from obstructing the roof drain pipe. These types of drains operate via gravity funneling standing water through the roof drain system. They are 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 enter 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 eliminates air from the system and permits smaller pipe diameters to be used. When all of the air is eliminated, a negative air pressure in the tail portion of the drain is set up which pulls water off the roof siphonically. Though used mainly 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 cover in and around Pinson, Alabama, give us a call. We'd be glad to help.