At this time there are a few distinct varieties of roof water drains and roof drain cover in Moulton, AL and each is an unique solution to the wide range of roof types and their drainage concerns. You need to consider the type of roof, its size, and the roof pitch to be able to pick the most suitable drain. You also should take into consideration the site of the drain, what amount of rainwater is expected and safe practices when selecting a roof drain for a residence or business building. Hip roofs, dormers, gable and mansard roofs shed water due to gravitational force. Flat roofs, conversely, accumulate water. Unless the water is routed out and away from the flat roof , it will most likely create pools of water that could eventually leak and the amassed weight will subsequently cause compromising the integrity of the structure. That is why roofs with a pitch of less than two percent should have roof drains positioned at the lowest places on the roof where water puddles and need to be evenly spaced all throughout the roof top.
Kinds of Roof Drains
There are a number of different variations of roof drains. They basically fall into 2 categories: pitched roof drains and flat roof drains. Pitched roof drains normally consist of gutters that accumulate rainwater which passes via gravity to the roof edge. Gutters channel this water in the direction of downspouts which direct the water flow down and far away from the structure or into sewer lines. Flat roof drains are one of three main types: scuppers, inner drains or siphonic drains.
Roof Drain Scuppers
Scuppers are situated on a roof's periphery. Scuppers can also be placed on a balcony or terrace. Small holes are cut into the side of the roof structure so that water can flow out and drain the roof top. Scuppers can attach to a downspout, or could be extended so that water is directed away from the building sides and foundation.
Interior Roof Drains
There are many kinds of inner drains for flat roofs. These are positioned at low areas in the roof and connect to interior drainage pipes that drive water outside or in to a sewer system. Many versions of internal roof drains have domes, strainers or covers which prevent debris from obstructing the roof drain pipe. These kinds of drains work via gravitational force channeling pooling 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 alternative to gravity drainage. Traditional 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 body it produces a siphonic drain which removes air from the system and permits smaller sized pipe diameters to be used. When all air is eliminated, a negative air pressure in the tail piece of the drain is set up which attracts water off the roof siphonically. Though 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 cover in and around Moulton, Alabama, give us a call. We'd be glad to help.