There are a number of distinct kinds of roof water drains and roof drain cover in Montevallo, AL and each is a specific solution to the variety of roof types and their drainage concerns. You need to consider the kind of roof, its size, and the roof pitch to be able to select the correct drain. You also may want to think about the location of the drain, how much rainwater is expected and safe practices when selecting a roof water drain for a home or business building. Gambrel, dormers, hip and gable roofs shed water because of gravity. Flat roofs, conversely, accumulate rain water. Until this water is guided out and away from the flat roof structure, it will most likely develop pools that could eventually leak and the amassed weight will eventually cause structural damage. That is why roofs with a slope of under two percent ought to have roof drains positioned at the lowest areas on the roof in which water puddles and need to be evenly spread all throughout the roof top.
Kinds of Roof Drains
There are a number of distinct alternatives of roof drains. They generally fall into two categories: flat roof drains and pitched roof drains. Pitched roof drains normally comprise gutters that collect rainwater which travels via gravity down to the roof periphery. Gutters direct this water towards downspouts which steer the water flow down and far away from the structure or in to sewer lines. Flat roof drains are one of three main types: scuppers, inner drains or siphonic drains.
Roof Drain Scuppers
Scuppers are situated on the roof's periphery. They can also be placed on a balcony or terrace. Small openings are cut into the side of the roof structure so water can empty and drain the roof surface. Scuppers can connect to a downspout, or can be extended to make sure that water is guided away from the structure sides and foundation.
Interior Roof Drains
There are quite a few different types of inner drains for flat roofs. They are installed at low places on the roof and attach to inner drainage pipes that drive water outdoors or into a sewer system. Several designs of inner roof drains have domes, strainers or covers which prevent trash from blocking the roof drain pipe. These types of drains work via gravity funneling pooling water thru the roof drain system. They can be constructed from PVC, cast iron or cast aluminum.
Siphonic Roof DrainsSiphonic roof drains are a more effective substitute for gravity drainage. Traditional flat roof drainage allows 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 system it creates a siphonic drain which eliminates air from the system and permits smaller pipe diameters . When all of the air is removed, a negative air pressure in the tail piece of the drain is set up which pulls rainwater off the roof siphonically. Though 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 cover in and around Montevallo, Alabama, give us a call. We'd be glad to help.