There are several distinct kinds of roof water drains and roof drain strainer in Leeds, AL and each one is a specific solution to the wide range of roof styles and their drainage concerns. You must look at the type of roof, its size, and its roof pitch to be able to choose the most suitable drain. You also may want to think about the location of the drain, what amount of rainwater is expected and safe practices when choosing a roof drain for a house or business building. Hip roofs, dormers, gable and mansard roofs shed rainwater water because of gravitational force. Flat roofs, conversely, collect rain water. Until this water is routed out and away from the roof , it will develop pools of water that may eventually leak and the accumulated weight will eventually result in compromising the integrity of the structure. That is why roofs with a pitch of below 2% should have roof drains located at the lowest places on the roof in which water pools and need to be uniformly spread all throughout the roof top.
Roof Drain Kinds
There are a number of different alternatives of roof drains. They basically fall into two groups: pitched roof drains and flat roof drains. Pitched roof drains usually comprise gutters which collect rainwater which travels via gravity to the roof edge. Gutters transport this water in the direction of downspouts which steer the water flow down and away from the building or into sewers. Flat roof drains can be one of three primary types: scuppers, inner drains or siphonic drains.
Roof Drain Scuppers
Scuppers are situated on a 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 connect to a downspout, or can be lengthened so that water is directed off of 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 areas in the roof and attach to inner drainage pipes that direct water outside or into a sewer system. Several designs of internal roof drains have domes, strainers or covers that prevent trash from obstructing the roof drain pipe. These types of drains operate via gravity funneling standing 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 allows both air and water to go into the drain system producing pipe space occupied by both air and water. By incorporating an engineered baffle to the sump of the drain body it creates a siphonic drain that eliminates air from the system and allows for smaller pipe diameters to be used. When all air is removed, a negative air pressure in the tail portion of the drain is set up which pulls rainwater off the roof siphonically. Although used mainly 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 strainer in and around Leeds, Alabama, give us a call. We'd be glad to help.