There are a few distinct varieties of roof water drains and roof drain cover in Northport, AL and each one is an unique solution to the variety of roof types and their drainage concerns. You should look at the type of roof, its dimensions, and its roof pitch to be able to choose the right drain. You also need to take into account the site of the drain, what amount of rainwater is anticipated and safety when choosing a roof drain for a house or business structure. Hip roofs, dormers, gable and mansard roofs shed rainwater water thanks to gravitational force. Flat roofs, alternatively, collect water. Unless this water is routed out and away from the flat roof , it will create pools that could eventually leak and the amassed weight may subsequently cause damage to the structure. That is why roofs with a slope of less than two percent should have roof drains situated at the lowest places on the roof in which water puddles and need to be uniformly spaced all throughout the roof surface.
Types of Roof Drains
There are a number of distinct alternatives of roof drains. They basically fall into 2 groups: flat roof drains and pitched roof drains. Pitched roof rainwater drains normally comprise gutters that accumulate rainwater which travels by means of gravity down to the roof periphery. Gutters direct this water towards downspouts which steer the water flow down and away from the building or into sewers. Flat roof drains can be one of three main types: scuppers, inner drains or siphonic drains.
Roof Rainwater Drain Scuppes
Scuppers are located on a roof's periphery. Scuppers can also be installed on a balcony or terrace. Small openings 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 could be lengthened so that water is directed 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 areas on the roof and attach to interior drainage pipes that drive water outside or into a sewer system. Several designs of internal roof drains have domes, strainers or covers which keep debris from blocking the roof drain pipe. These types of drains operate via gravity funneling standing water through the roof drain system. They are made of PVC, cast iron or cast aluminum.
Siphonic Roof DrainsSiphonic roof drains are a more effective alternative to gravity drainage. Standard 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 system it produces a siphonic drain that eliminates air from the system and permits smaller sized pipe diameters . When all air is removed, a negative air pressure in the tail portion of the drain is established which attracts rainwater off the roof siphonically. Though used primarily 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 cover in and around Northport, Alabama, give us a call. We'd be glad to help.