There are a number of distinct types of roof water drains and roof drain pipe in Dothan, AL and each one is a specific answer to the wide range of roof types and their drainage issues. You need to take into consideration the type of roof, its size, and the roof pitch to be able to pick the right drain. You also should take into consideration the site of the drain, how much rainwater is expected and safety when selecting a roof drain for a home or business structure. Hip roofs, dormers, gable and mansard roofs shed rainwater water due to gravitational force. Flat roofs, on the other hand, accumulate water. Until the water is directed out and away from the roof structure, it will develop pools of water that could inevitably leak and the accumulated weight will subsequently result in compromising the integrity of the structure. That is the reason that roofs with a slope of less than two percent ought to have roof drains located at the lowest spots on the roof in which water puddles and need to be evenly spread all throughout the roof top.
Types of Roof Drains
There are several different alternatives of roof drains. They basically fall into 2 groups: flat roof drains and pitched roof drains. Pitched roof drains normally comprise gutters that accumulate rainwater which travels via gravity down to the roof periphery. Gutters direct this water in the direction of downspouts which route the water flow down and away from the building or into sewers. Flat roof drains are one of three primary types: scuppers, inner drains or siphonic drains.
Roof Drain Scuppers
Scuppers are situated on a roof's periphery. They can also be put in on a balcony or terrace. Small holes are cut in the side of the roof structure so that rain water can flow out and drain the roof surface. Scuppers can attach to a downspout, or could be extended so that water is directed off of the structure sides and foundation.
Interior Roof Drains
There are many types of inner drains for flat roofs. They are installed at low areas in the roof and connect to inner drainage pipes that route water outdoors or in to a sewer system. Several versions of internal roof drains have domes, strainers or covers that keep debris from blocking the roof drain pipe. These kinds of drains operate via gravity channeling standing water thru the roof drain system. They can be made of PVC, cast iron or cast aluminum.
Siphonic Roof DrainsSiphonic roof drains are a more effective alternative to gravity drainage. Conventional flat roof drainage permits both air and water to go into the drain system creating pipe space 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 pipe diameters to be used. When all of the air is eliminated, a negative air pressure in the tail piece of the drain is established which attracts water off the roof siphonically. Although used mainly for flat roofs, siphonic drains can also be installed on pitched roofs.
If you need more information about flat roof drain or roof drain pipe in and around Dothan, Alabama, give us a call. We'd be glad to help.