Roof Drains


At this time there are a number of distinct kinds of roof drains and roof drain dome in Pelham, AL and each one is a specific solution to the wide range of roof styles and their drainage issues. You must take into consideration the type of roof, its dimensions, and its roof pitch to be able to pick the correct drain. You also may want to take into consideration the location of the drain, how much rainwater is expected and safety when selecting a roof drain for a house or business building.

Gable, dormer, mansard and hip roofs shed water because of gravity. Flat roofs, conversely, accumulate water. Unless this water is directed out and away from the roof , it will most likely develop pools of water that may inevitably leak and the accumulated weight may eventually result in structural damage. That is why roofs with a slope of less than 2% ought to have roof drains located at the lowest spots on the roof in which water puddles and should be evenly spread throughout the roof top.

Roof Drain Kinds


There are a number of distinct alternatives of roof drains. They basically fall into two categories: flat roof drains and pitched roof drains. Pitched roof drains usually consist of gutters that accumulate rainwater which passes by means of gravity down to the roof edge. Gutters direct this water in the direction of downspouts which direct the water flow down and far away from the building or into sewer lines. Flat roof drains can be one of three main types: scuppers, inner drains or siphonic drains.

Roof Rainwater Drain Scuppes


Scuppers are situated on the roof's periphery. They can also be placed on a balcony or terrace. Small holes are cut into the side of the roof structure so rain water can empty and drain the roof top. Scuppers can connect to a downspout, or can be lengthened to make sure that water is guided off of the structure sides and foundation.

Inner Roof Drains


There are many kinds of inner drains for flat roofs. They are positioned at low spots in the roof and attach to interior drainage pipes that direct water outdoors or in to a sewer system. Several styles of internal roof drains have domes, strainers or covers that prevent debris from obstructing the roof drain pipe. These types of drains work via gravitational force channeling pooling water thru the roof drain system. They are constructed from PVC, cast iron or cast aluminum.

Siphonic Roof Drains

Siphonic roof drains are a more efficient substitute for gravity drainage. Conventional flat roof drainage permits both air and water to go into the drain system producing pipe space occupied by both air and water. By incorporating an engineered baffle to the sump of the drain system it creates a siphonic drain which eliminates air from the system and allows for smaller pipe diameters to be used. When all of the air is eliminated, a negative air pressure in the tail portion of the drain is established which pulls rainwater off the roof siphonically. Though used primarily for flat roofs, siphonic drains can also be set up on pitched roofs.

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