There are several distinct varieties of roof water drains and roof drain cover in Gardendale, AL and each is a specific approach to the wide range of roof types and their drainage challenges. You need to consider the kind of roof, its dimensions, and its roof pitch to be able to select the correct drain. You also may want to take into account the site of the drain, how much rainwater is anticipated and safe practices when choosing a roof drain for a home or business building. Hip roofs, dormers, gable and mansard roofs shed rainwater water thanks to gravitational force. Flat roofs, on the other hand, accumulate rain water. Unless the water is directed out and away from the flat roof , it will most likely develop pools of water that could eventually leak and the accumulated weight may subsequently result in damage to the structure. That is why roofs with a pitch of below two percent ought to have roof drains positioned in the lowest places on the roof where water pools and should be evenly spread all throughout the roof surface.
Kinds of Roof Drains
There are several distinct alternatives of roof drains. They basically fall into 2 groups: flat roof drains and pitched roof drains. Pitched roof rainwater drains usually consist of gutters which collect rainwater that travels via gravity down to the roof periphery. Gutters direct this water in the direction of downspouts which steer the water flow down and far away from the building or in to sewers. Flat roof drains are 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 installed on a balcony or terrace. Small openings are cut in 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 directed away from the structure sides and foundation.
Inner Roof Drains
There are many types of inner drains for flat roofs. They are positioned at low spots in the roof and attach to inner drainage pipes that direct water outside or in to a sewer system. Several versions of internal roof drains have domes, strainers or covers which keep trash from clogging the roof drain pipe. These types of drains work via gravity funneling standing 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. Traditional flat roof drainage permits both air and water to go into the drain system creating pipe space which is 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 allows for smaller pipe diameters . When all air is eliminated, a negative air pressure in the tail portion of the drain is established which attracts rainwater off the roof siphonically. Though used mainly for flat roofs, siphonic drains can also be installed on angled roofs.
If you need more information about flat roof drain or roof drain cover in and around Gardendale, Alabama, give us a call. We'd be glad to help.