Roof Drains


At this time there are several different varieties of roof drains and roof drain cover in Jacksonville, AL and each is an unique solution to the variety of roof types and their drainage issues. You should think about the kind of roof, its size, and the roof pitch to be able to pick the correct drain. You also should take into consideration the site of the drain, what amount of rainwater is expected and safe practices when choosing a roof drain for a home or commercial structure.

Gable, dormer, mansard and hip roofs shed rainwater water due to gravity. Flat roofs, alternatively, accumulate rain water. Until this water is routed out and away from the roof , it will most likely create pools that could eventually leak and the accumulated weight will subsequently cause compromising the integrity of the structure. That is why roofs with a pitch of less than two percent ought to have roof drains positioned in the lowest places on the roof where water pools and should be evenly spaced throughout the roof surface.

Types of Roof Drains


There are several distinct alternatives of roof drains. They basically fall into two categories: flat roof drains and pitched roof drains. Pitched roof rainwater drains usually consist of gutters that accumulate rainwater which passes via gravity down to the roof edge. Gutters channel this water in the direction of downspouts which route the water flow down and far away from the structure or in to sewers. Flat roof drains are one of three primary types: scuppers, inner drains or siphonic drains.

Roof Drain Scuppers


Scuppers are located on a roof's perimeter. Scuppers can also be put in on a balcony or terrace. Small holes are cut into the side of the roof structure so that water can empty and drain the roof surface. Scuppers can attach to a downspout, or can be lengthened so that water is guided off of the structure sides and foundation.

Inner Roof Drains


There are quite a few different kinds of inner drains for flat roofs. These are positioned at low spots on the roof and connect to inner drainage pipes that route water outside or into a sewer system. Several versions of inner roof drains have domes, strainers or covers which prevent debris from obstructing the roof drain pipe. These kinds of drains work via gravity funneling pooling water thru the roof drain system. They can be made 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 allows both air and water to go into the drain system creating pipe space which is occupied by both air and water. By adding an engineered baffle to the sump of the drain body it creates a siphonic drain which removes air from the system and permits smaller pipe diameters to be used. When all air is eliminated, a negative air pressure in the tail portion of the drain is established which attracts rainwater off the roof siphonically. Though 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 cover in and around Jacksonville, Alabama, give us a call. We'd be glad to help.