Roof Drains


At this time there are a few distinct types of roof drains and roof drain pvc in Pinson, AL and each is an unique solution to the variety of roof types and their drainage issues. You should look at the type of roof, its dimensions, and its roof pitch to be able to choose the most suitable drain. You also need to take into consideration the location of the drain, what amount of rainwater is expected and safety when choosing a roof drain for a house or commercial building.

Hip roofs, dormers, gable and mansard roofs shed water due to gravitational force. Flat roofs, conversely, accumulate water. Until the water is guided out and away from the flat roof structure, it will most likely develop pools of water that could inevitably leak and the amassed weight will eventually result in damage to the structure. That is why roofs with a slope of under two percent should have roof drains located in the lowest areas on the roof where water pools and need to be evenly spaced throughout the roof surface.

Roof Drain Kinds


There are several different variations of roof drains. They basically fall into two groups: flat roof drains and pitched roof drains. Pitched roof rainwater drains normally consist of gutters which collect rainwater which travels by means of gravity to the roof periphery. Gutters transport this water in the direction of downspouts which direct the water flow down and away from the structure or into sewer lines. Flat roof drains are one of three main types: scuppers, inner drains or siphonic drains.

Roof Drain Scuppers


Scuppers are located on the roof's periphery. 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 surface. Scuppers can hook up to a downspout, or could be extended to make sure that water is guided off of the structure sides and foundation.

Inner Roof Drains


There are many types of inner drains for flat roofs. These are installed at low spots on the roof and attach to interior drainage pipes that drive water outside or into a sewer system. Many versions of inner roof drains have domes, strainers or covers which keep debris from blocking the roof drain pipe. These types of drains operate 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 enter the drain system creating pipe space which is occupied by both air and water. By incorporating an engineered baffle to the sump of the drain system it produces a siphonic drain which eliminates air from the system and permits smaller pipe diameters . When all air is eliminated, a negative air pressure in the tail portion of the drain is set up which draws rainwater off the roof siphonically. Though used primarily 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 pvc in and around Pinson, Alabama, give us a call. We'd be glad to help.