Roof Drains


At this time there are a number of distinct varieties of roof drains and roof drain cover in Bessemer, AL and each one is a specific approach to the variety of roof types and their drainage challenges. You must take into consideration the kind of roof, its dimensions, and its roof pitch to be able to pick the correct drain. You also should take into account the location of the drain, how much rainwater is expected and safety when selecting a roof water drain for a home or commercial structure.

Gable, dormer, mansard and hip roofs shed rainwater water because of gravity. Flat roofs, on the other hand, accumulate water. Unless the water is directed out and away from the roof structure, it will develop pools of water that may inevitably leak and the accumulated weight will subsequently result in compromising the integrity of the structure. That is the reason that roofs with a pitch of under two percent should have roof drains located in the lowest places on the roof where water puddles and should be uniformly spread all throughout the roof surface.

Kinds of Roof Drains


There are a number of different variations of roof drains. They generally fall into two categories: pitched roof drains and flat roof drains. Pitched roof drains normally comprise gutters that accumulate rainwater which passes by means of gravity down to the roof periphery. Gutters transport this water towards downspouts which direct the water flow down and far away from the structure or in to sewers. Flat roof drains are one of three main types: scuppers, inner drains or siphonic drains.

Roof Rainwater Drain Scuppes


Scuppers are located on the roof's periphery. Scuppers can also be put in on a balcony or terrace. Small openings are cut in the side of the roof structure so water can flow out and drain the roof surface. Scuppers can hook up to a downspout, or can be extended so that water is directed off of the structure sides and foundation.

Inner Roof Drains


There are many kinds of inner drains for flat roofs. They are installed at low areas on the roof and attach to inner drainage pipes that route water outdoors or in to a sewer system. Many styles of internal roof drains have domes, strainers or covers which keep trash from blocking the roof drain pipe. These kinds of drains operate via gravity channeling standing water thru the roof drain system. They can be constructed from PVC, cast iron or cast aluminum.

Siphonic Roof Drains

Siphonic roof drains are a more effective alternative to gravity drainage. Conventional flat roof drainage permits both air and water to go into the drain system creating 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 allows for smaller pipe diameters . When all air is removed, a negative air pressure in the tail piece of the drain is set up which attracts water off the roof siphonically. Though 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 cover in and around Bessemer, Alabama, give us a call. We'd be glad to help.