At this time there are several distinct kinds of roof drains and roof drain strainer in Birmingham, AL and each is an unique answer to the wide range of roof styles and their drainage concerns. You should consider the kind of roof, its dimensions, and the roof pitch to be able to select the correct drain. You also may want to take into consideration the site of the drain, what amount of rainwater is anticipated and safe practices when selecting a roof water drain for a residence or business building. Gable, dormer, mansard and hip roofs shed water thanks to gravitational force. Flat roofs, alternatively, collect rain water. Until this water is routed out and away from the flat roof structure, it will most likely develop pools that may eventually leak and the accumulated weight will subsequently cause compromising the integrity of the structure. That is why roofs with a pitch of below two percent ought to have roof drains located in the lowest spots on the roof in which water pools and should be uniformly spread all throughout the roof top.
Types of Roof Drains
There are a number of different variations of roof drains. They basically fall into two categories: pitched roof drains and flat roof drains. Pitched roof drains normally consist of gutters which collect rainwater that travels via gravity down to the roof periphery. Gutters channel this water towards downspouts which direct the water flow down and away from the structure or into 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. They can also be installed on a balcony or terrace. Small holes are cut into the side of the roof structure so that rain water can empty and drain the roof surface. Scuppers can connect to a downspout, or could be lengthened to make sure that water is guided 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 positioned at low places on the roof and connect to inner drainage pipes that route water outside or into a sewer system. Many models of inner roof drains have domes, strainers or covers that keep debris from blocking the roof drain pipe. These kinds of drains work 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 efficient substitute for gravity drainage. Conventional flat roof drainage allows both air and water to enter the drain system producing pipe space occupied by both air and water. By incorporating an engineered baffle to the sump of the drain system it produces a siphonic drain which eliminates air from the system and allows for smaller sized pipe diameters to be used. When all air is removed, a negative air pressure in the tail piece of the drain is set up which attracts water off the roof siphonically. Although used primarily for flat roofs, siphonic drains can also be installed on pitched roofs.
If you need more information about flat roof drain or roof drain strainer in and around Birmingham, Alabama, give us a call. We'd be glad to help.