At this time there are a few different kinds of roof drains and roof drain cover in Leeds, AL and each is a specific solution to the wide range of roof types and their drainage challenges. You need to take into consideration the type of roof, its dimensions, and the roof pitch to be able to pick the correct drain. You also need to take into account the location of the drain, what amount of rainwater is anticipated and safe practices when choosing a roof water drain for a home or business building. Hip roofs, dormers, gable and mansard roofs shed water because of gravitational force. Flat roofs, alternatively, accumulate rain water. Unless the water is routed out and away from the flat roof structure, it will most likely develop pools that could eventually leak and the amassed weight will subsequently result in damage to the structure. That is why roofs with a pitch of under 2% ought to have roof drains situated at the lowest places on the roof where water puddles and need to be uniformly spaced throughout the roof top.
Roof Drain Types
There are several distinct alternatives of roof drains. They basically fall into 2 categories: flat roof drains and pitched roof drains. Pitched roof rainwater drains usually consist of gutters that accumulate rainwater which passes by means of gravity to the roof edge. Gutters direct this water towards downspouts which direct the water flow down and away from the structure or in to sewers. Flat roof drains can be one of three main types: scuppers, inner drains or siphonic drains.
Roof Drain Scuppers
Scuppers are situated on the roof's perimeter. Scuppers can also be placed on a balcony or terrace. Small holes are cut in the side of the roof structure so rain water can empty and drain the roof top. Scuppers can hook up to a downspout, or can be lengthened so that water is guided off of the structure sides and foundation.
Inner Roof Drains
There are quite a few different types of inner drains for flat roofs. These are installed at low spots on the roof and connect to interior drainage pipes that drive water outdoors or in to a sewer system. Many versions of inner roof drains have domes, strainers or covers which keep debris from blocking the roof drain pipe. These types of drains operate via gravitational force funneling pooling water thru the roof drain system. They are made of PVC, cast iron or cast aluminum.
Siphonic Roof DrainsSiphonic roof drains are a more efficient 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 which eliminates air from the system and permits smaller pipe diameters . When all air is eliminated, a negative air pressure in the tail piece of the drain is established which draws water off the roof siphonically. Though used primarily for flat roofs, siphonic drains can also be set up on pitched roofs.
If you need more information about flat roof drain or roof drain cover in and around Leeds, Alabama, give us a call. We'd be glad to help.