At this time there are a few different varieties of roof water drains and roof drain pan in Northport, AL and each one is an unique answer to the wide range of roof styles and their drainage concerns. You must take into consideration the kind of roof, its size, and its roof pitch to be able to select the right drain. You also need to take into account the location of the drain, how much rainwater is expected and safe practices when selecting a roof drain for a house or business structure. Gambrel, dormers, hip and gable roofs shed rainwater water thanks to gravity. Flat roofs, alternatively, accumulate water. Unless the water is routed out and away from the roof , it will most likely create pools of water that may eventually leak and the accumulated weight will subsequently cause damage to the structure. That is why roofs with a pitch of under two percent should have roof drains positioned in the lowest spots on the roof where water pools and should be uniformly spaced throughout the roof top.
Roof Drain Types
There are a number of different alternatives of roof drains. They generally fall into two categories: flat roof drains and pitched roof drains. Pitched roof drains usually consist of gutters which accumulate rainwater that passes by means of gravity to the roof periphery. Gutters channel this water towards downspouts which direct the water flow down and away from the building 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 installed on a balcony or terrace. Small holes are cut into the side of the roof structure so that water can empty and drain the roof surface. Scuppers can attach to a downspout, or could be lengthened so that water is guided off of the building sides and foundation.
Interior Roof Drains
There are quite a few different kinds of inner drains for flat roofs. They are installed at low spots on the roof and connect to inner drainage pipes that route water outdoors or in to a sewer system. Several styles of internal roof drains have domes, strainers or covers which prevent trash from blocking the roof drain pipe. These types of drains work via gravity channeling pooling water through the roof drain system. They can be constructed from 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 enter the drain system creating pipe space which is occupied by both air and water. By adding an engineered baffle to the sump of the drain system it produces a siphonic drain that removes air from the system and allows for smaller pipe diameters to be used. When all of the air is removed, a negative air pressure in the tail portion of the drain is set up which attracts rainwater off the roof siphonically. Although used mainly for flat roofs, siphonic drains can also be set up on angled roofs.
If you need more information about flat roof drain or roof drain pan in and around Northport, Alabama, give us a call. We'd be glad to help.