Roof Drains


At this time there are a number of distinct kinds of roof drains and roof drain pvc in Killen, AL and each one is a specific solution to the wide range of roof types and their drainage challenges. You need to take into consideration the type of roof, its dimensions, and the roof pitch to be able to pick the correct drain. You also may want to take into account the site of the drain, how much rainwater is anticipated and safety when choosing a roof drain for a residence or commercial building.

Gable, dormer, mansard and hip roofs shed rainwater water due to gravity. Flat roofs, alternatively, collect rain water. Unless the water is routed out and away from the roof structure, it will most likely create pools that may eventually leak and the accumulated weight will eventually result in compromising the integrity of the structure. That is the reason that roofs with a pitch of less than 2% ought to have roof drains situated in the lowest areas on the roof in which water pools and should be uniformly spread throughout the roof top.

Kinds of Roof Drains


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

Roof Rainwater Drain Scuppes


Scuppers are situated on the roof's perimeter. 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 flow out and drain the roof top. Scuppers can attach to a downspout, or could be extended so that water is guided away from the structure sides and foundation.

Inner Roof Drains


There are many types of inner drains for flat roofs. These are installed at low places on the roof and attach to inner drainage pipes that route water outdoors or into a sewer system. Many versions of inner roof drains have domes, strainers or covers which keep trash from clogging the roof drain pipe. These types of drains work via gravitational force 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 efficient substitute for gravity drainage. Traditional flat roof drainage permits both air and water to go into the drain system creating pipe space occupied by both air and water. By incorporating an engineered baffle to the sump of the drain body it produces a siphonic drain which removes air from the system and permits smaller sized pipe diameters to be used. When all of the air is removed, a negative air pressure in the tail portion of the drain is established which attracts water off the roof siphonically. Although 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 pvc in and around Killen, Alabama, give us a call. We'd be glad to help.