Roof Drains


At this time there are a number of distinct varieties of roof drains and roof drain pvc in Florence, AL and each is a specific solution to the wide range of roof styles and their drainage issues. You must take into consideration 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 safe practices when selecting a roof drain for a residence or business structure.

Hip roofs, dormers, gable and mansard roofs shed rainwater water thanks to gravity. Flat roofs, conversely, accumulate water. Unless this water is guided out and away from the roof , it will develop pools of water that may eventually leak and the accumulated weight may eventually cause compromising the integrity of the structure. That is the reason that roofs with a pitch of less than two percent ought to have roof drains positioned at the lowest areas on the roof in which water pools and should be evenly spread all throughout the roof top.

Types 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 drains normally comprise gutters that collect rainwater which travels via gravity down to the roof periphery. Gutters channel this water in the direction of downspouts which direct the water flow down and far away from the structure or in to sewer lines. Flat roof drains are one of three primary types: scuppers, inner drains or siphonic drains.

Roof Drain Scuppers


Scuppers are located on the roof's perimeter. They can also be placed on a balcony or terrace. Small openings are cut into the side of the roof structure so water can flow out and drain the roof top. Scuppers can connect 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 quite a few different types of inner drains for flat roofs. These are positioned at low areas in the roof and connect to inner drainage pipes that direct water outdoors or into a sewer system. Several styles of inner roof drains have domes, strainers or covers which keep 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 made of PVC, cast iron or cast aluminum.

Siphonic Roof Drains

Siphonic roof drains are a more efficient substitute for gravity drainage. Traditional flat roof drainage allows both air and water to enter the drain system creating 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 which removes air from the system and permits smaller pipe diameters to be used. When all of the air is removed, a negative air pressure in the tail portion of the drain is set up which attracts rainwater off the roof siphonically. Although 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 Florence, Alabama, give us a call. We'd be glad to help.