Roof Drains


At this time there are a few different kinds of roof water drains and roof drain pipe in Florence, AL and each one is an unique approach to the variety of roof types and their drainage issues. You must look at the kind of roof, its dimensions, and its roof pitch to be able to select the correct drain. You also should take into account the site of the drain, what amount of rainwater is anticipated and safety when choosing a roof water drain for a house or commercial structure.

Hip roofs, dormers, gable and mansard roofs shed water because of gravitational force. Flat roofs, alternatively, collect water. Until this water is routed out and away from the flat roof , it will most likely create pools of water that could inevitably leak and the amassed weight will eventually cause compromising the integrity of the structure. That is why roofs with a slope of less than 2% ought to have roof drains located in the lowest places on the roof where water pools and should be evenly spaced all throughout the roof surface.

Roof Drain Kinds


There are a number of distinct variations of roof drains. They basically fall into 2 groups: flat roof drains and pitched roof drains. Pitched roof drains usually consist of gutters that accumulate rainwater that travels via gravity to the roof edge. Gutters direct this water in the direction of downspouts which steer the water flow down and away from the structure or in to sewer lines. Flat roof drains can be one of three main types: scuppers, inner drains or siphonic drains.

Roof Drain Scuppers


Scuppers are located on a roof's periphery. Scuppers can also be installed on a balcony or terrace. Small holes are cut in the side of the roof structure so that rain water can flow out and drain the roof surface. Scuppers can hook up to a downspout, or can be extended to make sure that water is directed off of the building sides and foundation.

Interior Roof Drains


There are many kinds of inner drains for flat roofs. They are positioned at low places on the roof and connect to inner drainage pipes that route water outdoors or into a sewer system. Many styles of internal roof drains have domes, strainers or covers which keep debris from clogging the roof drain pipe. These types of drains operate via gravity funneling standing water thru the roof drain system. They are made of PVC, cast iron or cast aluminum.

Siphonic Roof Drains

Siphonic roof drains are a more efficient alternative to gravity drainage. Standard 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 system it creates a siphonic drain which removes air from the system and permits smaller pipe diameters . When all of the air is eliminated, a negative air pressure in the tail piece of the drain is established which attracts rainwater 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 pipe in and around Florence, Alabama, give us a call. We'd be glad to help.