Roof Drains


There are a number of different varieties of roof drains and roof drain pvc in Fairfield, AL and each is an unique solution to the wide range of roof styles and their drainage issues. You must take into consideration the type of roof, its size, and the roof pitch to be able to choose the correct drain. You also should take into consideration the site of the drain, how much rainwater is expected and safety when choosing a roof water drain for a residence or commercial structure.

Gable, dormer, mansard and hip roofs shed water due to gravitational force. Flat roofs, on the other hand, collect rain water. Unless this water is routed out and away from the roof structure, it will most likely create pools that could inevitably leak and the accumulated weight may eventually result in damage to the structure. That is the reason that roofs with a slope of under 2% ought to have roof drains situated at the lowest areas on the roof where water puddles and should be uniformly spread throughout the roof top.

Kinds of Roof Drains


There are a number of distinct variations of roof drains. They generally fall into two categories: flat roof drains and pitched roof drains. Pitched roof rainwater drains normally comprise gutters which collect rainwater which passes via gravity to the roof periphery. Gutters direct this water in the direction of downspouts which direct the water flow down and far away from the structure 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 the roof's perimeter. They can also be placed on a balcony or terrace. Small openings are cut in the side of the roof structure so rain water can empty and drain the roof top. Scuppers can attach to a downspout, or can be extended so that water is directed away from the building sides and foundation.

Inner Roof Drains


There are quite a few different kinds of inner drains for flat roofs. These are installed at low spots in the roof and attach to interior drainage pipes that drive water outside or in to a sewer system. Several styles of internal roof drains have domes, strainers or covers which keep trash from obstructing the roof drain pipe. These types of drains operate via gravity funneling standing 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 alternative to gravity drainage. Conventional flat roof drainage allows 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 body it produces a siphonic drain that eliminates air from the system and allows for smaller pipe diameters to be used. When all of the air is removed, a negative air pressure in the tail piece of the drain is set up which pulls water off the roof siphonically. Though used primarily for flat roofs, siphonic drains can also be installed on pitched roofs.

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