Roof Drains


There are several different types of roof drains and roof drain pvc in Prattville, AL and each is an unique solution to the variety of roof types and their drainage challenges. You need to look at the type of roof, its dimensions, and its roof pitch to be able to select the correct drain. You also may want to take into consideration the site of the drain, how much rainwater is anticipated and safety when choosing a roof water drain for a house or commercial building.

Gable, dormer, mansard and hip roofs shed rainwater water due to gravitational force. Flat roofs, alternatively, collect water. Until this water is routed out and away from the roof structure, it will most likely create pools of water that may eventually leak and the amassed weight will eventually cause structural damage. That is the reason that roofs with a pitch of less than 2% ought to have roof drains situated in the lowest places on the roof in which water puddles and need to be evenly spaced throughout the roof surface.

Types of Roof Drains


There are several distinct variations of roof drains. They generally fall into 2 groups: flat roof drains and pitched roof drains. Pitched roof rainwater drains usually comprise gutters which collect rainwater which passes via gravity down to the roof edge. Gutters direct this water towards downspouts which route the water flow down and far away from the building or into sewers. Flat roof drains are one of three main types: scuppers, inner drains or siphonic drains.

Roof Rainwater Drain Scuppes


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

Interior Roof Drains


There are quite a few different types of inner drains for flat roofs. These are positioned at low places on the roof and attach to inner drainage pipes that route water outside or in to a sewer system. Several versions of internal roof drains have domes, strainers or covers which prevent debris from obstructing the roof drain pipe. These types of drains operate via gravity channeling pooling 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 effective substitute for 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 produces a siphonic drain that eliminates air from the system and permits smaller pipe diameters . When all of the air is removed, a negative air pressure in the tail piece of the drain is set up which attracts water off the roof siphonically. Although used mainly 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 Prattville, Alabama, give us a call. We'd be glad to help.