Roof Drains


There are a number of distinct varieties of roof water drains and roof drain pan in Bessemer, AL and each is an unique solution to the variety of roof styles and their drainage concerns. You must look at the kind of roof, its size, and its roof pitch to be able to select the most suitable drain. You also should think about the location of the drain, what amount of rainwater is expected and safety when selecting a roof water drain for a house or commercial building.

Hip roofs, dormers, gable and mansard roofs shed rainwater water because of gravity. Flat roofs, on the other hand, accumulate water. Unless this water is guided out and away from the roof structure, it will create pools of water that could inevitably leak and the amassed weight will subsequently cause compromising the integrity of the structure. That is why roofs with a pitch of less than two percent should have roof drains located in the lowest spots on the roof where water pools and should be evenly spread throughout the roof top.

Roof Drain Kinds


There are a number of distinct variations of roof drains. They basically fall into 2 groups: pitched roof drains and flat roof drains. Pitched roof drains normally comprise gutters that accumulate rainwater that passes by means of gravity down to the roof edge. Gutters channel this water towards downspouts which route the water flow down and away from the building or in to sewers. Flat roof drains are one of three primary types: scuppers, inner drains or siphonic drains.

Roof Drain Scuppers


Scuppers are situated on a roof's periphery. Scuppers can also be placed on a balcony or terrace. Small openings are cut into the side of the roof structure so that rain water can empty and drain the roof surface. Scuppers can attach to a downspout, or could be lengthened so that water is directed off of the building sides and foundation.

Inner 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 connect to inner drainage pipes that drive water outdoors or in to a sewer system. Many styles of inner roof drains have domes, strainers or covers that prevent debris from clogging the roof drain pipe. These kinds of drains operate via gravitational force funneling standing water through the roof drain system. They can be made from PVC, cast iron or cast aluminum.

Siphonic Roof Drains

Siphonic roof drains are a more efficient alternative to gravity drainage. Standard flat roof drainage permits both air and water to go into 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 creates a siphonic drain that eliminates air from the system and permits smaller sized pipe diameters . When all of the air is removed, a negative air pressure in the tail piece of the drain is set up which draws water off the roof siphonically. Though used mainly for flat roofs, siphonic drains can also be installed on pitched roofs.

If you need more information about flat roof drain or roof drain pan in and around Bessemer, Alabama, give us a call. We'd be glad to help.