Roof Drains


At this time there are a number of different types of roof drains and roof drain scupper in Pinson, AL and each is an unique answer to the wide range of roof styles and their drainage concerns. You must think about the kind of roof, its size, and its roof pitch to be able to pick the correct drain. You also need to take into consideration the site of the drain, what amount of rainwater is anticipated and safety when choosing a roof drain for a house or business structure.

Gable, dormer, mansard and hip roofs shed rainwater water due to gravity. Flat roofs, conversely, accumulate water. Unless the water is guided out and away from the roof structure, it will create pools of water that may eventually leak and the accumulated weight will subsequently cause damage to the structure. That is why roofs with a pitch of less than two percent ought to have roof drains situated at the lowest areas on the roof in which water puddles and should be evenly spread all throughout the roof surface.

Types of Roof Drains


There are a number of distinct variations of roof drains. They basically fall into 2 categories: flat roof drains and pitched roof drains. Pitched roof rainwater drains usually comprise gutters that accumulate rainwater that passes by means of gravity down to the roof edge. Gutters direct 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 main types: scuppers, inner drains or siphonic drains.

Roof Drain Scuppers


Scuppers are situated on a roof's perimeter. They can also be put in on a balcony or terrace. Small openings are cut into the side of the roof structure so water can empty and drain the roof top. Scuppers can attach to a downspout, or could be lengthened so that water is directed off of the structure sides and foundation.

Interior Roof Drains


There are quite a few different types of inner drains for flat roofs. These are positioned at low areas on the roof and attach to inner drainage pipes that drive water outdoors or in to a sewer system. Several designs of inner roof drains have domes, strainers or covers that keep trash from clogging the roof drain pipe. These types of drains work via gravitational force funneling pooling water through the roof drain system. They can be constructed from PVC, cast iron or cast aluminum.

Siphonic Roof Drains

Siphonic roof drains are a more effective alternative to gravity drainage. Conventional flat roof drainage permits both air and water to enter the drain system producing pipe space occupied by both air and water. By adding an engineered baffle to the sump of the drain body it creates a siphonic drain that 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 mainly 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 scupper in and around Pinson, Alabama, give us a call. We'd be glad to help.