There are a few distinct types of roof drains and roof drain pan in Jasper, AL and each one is an unique answer to the wide range of roof types and their drainage issues. You need to look at the type of roof, its size, and the roof pitch to be able to select the most suitable drain. You also may want to think about the location of the drain, how much rainwater is anticipated and safe practices when selecting a roof drain for a house or business structure. Gable, dormer, mansard and hip roofs shed rainwater water because of gravitational force. Flat roofs, conversely, accumulate water. Until this water is directed out and away from the roof structure, it will most likely develop pools of water that could inevitably leak and the amassed weight will subsequently cause damage to the structure. That is why roofs with a pitch of below two percent ought to have roof drains positioned at the lowest places on the roof where water puddles and need to be uniformly spaced throughout the roof surface.
Kinds of Roof Drains
There are several different alternatives of roof drains. They generally fall into two groups: flat roof drains and pitched roof drains. Pitched roof drains usually comprise gutters that accumulate rainwater that passes via gravity to the roof periphery. Gutters channel this water in the direction of downspouts which route 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 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 water can empty and drain the roof surface. Scuppers can connect to a downspout, or can be extended so that water is directed off of the structure sides and foundation.
Interior Roof Drains
There are quite a few different kinds of inner drains for flat roofs. They are positioned at low places in the roof and connect to interior drainage pipes that route water outdoors or into a sewer system. Many designs of inner roof drains have domes, strainers or covers which keep debris from obstructing the roof drain pipe. These kinds of drains work via gravitational force channeling 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 substitute for gravity drainage. Conventional flat roof drainage permits both air and water to enter the drain system producing pipe space occupied by both air and water. By adding 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 sized 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. 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 pan in and around Jasper, Alabama, give us a call. We'd be glad to help.