At this time there are a few different varieties of roof water drains and roof drain strainer in Northport, AL and each is a specific approach to the wide range of roof styles and their drainage challenges. You need to think about the type of roof, its dimensions, and the roof pitch to be able to pick the right drain. You also need to take into account the site of the drain, what amount of rainwater is expected and safety when choosing a roof water drain for a home or business building. Gambrel, dormers, hip and gable roofs shed water because of gravitational force. Flat roofs, conversely, accumulate rain water. Until the water is guided out and away from the roof , it will create pools that could inevitably leak and the accumulated weight may subsequently result in structural damage. That is the reason that roofs with a slope of below two percent should have roof drains positioned at the lowest spots on the roof where water pools and need to be uniformly spaced all throughout the roof surface.
Roof Drain Kinds
There are several different alternatives of roof drains. They basically fall into 2 groups: pitched roof drains and flat roof drains. Pitched roof drains normally comprise gutters that collect rainwater that travels by means of gravity to the roof periphery. Gutters channel this water in the direction of downspouts which direct 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. Scuppers can also be placed on a balcony or terrace. Small openings are cut in the side of the roof structure so rain water can flow out and drain the roof surface. Scuppers can attach to a downspout, or can be lengthened to make sure that water is directed away from the structure sides and foundation.
Inner Roof Drains
There are quite a few different kinds of inner drains for flat roofs. They are positioned at low spots on the roof and attach to interior drainage pipes that route water outside or in to a sewer system. Several styles of inner roof drains have domes, strainers or covers that prevent debris from blocking the roof drain pipe. These types of drains operate via gravity funneling standing water thru the roof drain system. They are constructed from PVC, cast iron or cast aluminum.
Siphonic Roof DrainsSiphonic roof drains are a more efficient alternative to gravity drainage. Traditional flat roof drainage permits both air and water to enter 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 allows for smaller sized pipe diameters to be used. When all of the air is eliminated, a negative air pressure in the tail portion of the drain is established which attracts water off the roof siphonically. Although used primarily for flat roofs, siphonic drains can also be installed on angled roofs.
If you need more information about flat roof drain or roof drain strainer in and around Northport, Alabama, give us a call. We'd be glad to help.