Roof Drains


At this time there are a number of distinct types of roof drains and roof drain pan in Alabaster, AL and each one is a specific approach to the variety of roof styles and their drainage issues. You should think about the kind of roof, its dimensions, and the roof pitch to be able to choose the correct drain. You also need to take into consideration the site of the drain, how much rainwater is anticipated 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 gravitational force. Flat roofs, alternatively, collect water. Unless the water is directed out and away from the roof structure, it will most likely develop pools that could eventually leak and the accumulated weight will subsequently result in damage to the structure. That is the reason that roofs with a pitch of below two percent should have roof drains situated at the lowest areas on the roof in which water puddles and should be uniformly spaced all throughout the roof top.

Kinds of Roof Drains


There are a number of distinct alternatives of roof drains. They generally fall into two groups: pitched roof drains and flat roof drains. Pitched roof drains usually consist of gutters which collect rainwater that travels by means of gravity to the roof edge. Gutters direct this water towards downspouts which steer the water flow down and away from the building or into sewer lines. Flat roof drains are one of three primary types: scuppers, inner drains or siphonic drains.

Roof Rainwater Drain Scuppes


Scuppers are located on a roof's perimeter. They can also be put in on a balcony or terrace. Small openings are cut into the side of the roof structure so rain water can empty and drain the roof surface. Scuppers can attach to a downspout, or could be lengthened so that water is guided away from the building sides and foundation.

Interior Roof Drains


There are many kinds of inner drains for flat roofs. These are installed at low places on the roof and attach to inner drainage pipes that direct water outdoors or into a sewer system. Several designs of internal roof drains have domes, strainers or covers that prevent trash from obstructing the roof drain pipe. These types of drains operate via gravitational force funneling 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 efficient substitute for gravity drainage. Standard flat roof drainage permits both air and water to go into the drain system producing pipe space which is occupied by both air and water. By adding an engineered baffle to the sump of the drain system it produces a siphonic drain that removes air from the system and allows for smaller sized pipe diameters to be used. When all of the air is eliminated, 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 pan in and around Alabaster, Alabama, give us a call. We'd be glad to help.