Roof Drains


There are a number of different varieties of roof drains and roof drain downspout in Grand Bay, AL and each one is an unique approach to the variety of roof styles and their drainage issues. You should consider the kind of roof, its size, and its roof pitch to be able to pick the most suitable drain. You also need to take into account the site of the drain, what amount of rainwater is expected and safety when choosing a roof water drain for a house or business building.

Hip roofs, dormers, gable and mansard roofs shed rainwater water thanks to gravitational force. Flat roofs, conversely, accumulate rain water. Until this water is directed out and away from the flat roof , it will create pools of water that could inevitably leak and the accumulated weight will subsequently result in compromising the integrity of the structure. That is why roofs with a pitch of under 2% ought to have roof drains positioned in the lowest places on the roof in which water puddles and should be uniformly spaced all throughout the roof top.

Roof Drain Kinds


There are a number of different alternatives of roof drains. They generally fall into 2 categories: flat roof drains and pitched roof drains. Pitched roof rainwater drains usually consist of gutters which collect rainwater that passes via gravity down to the roof periphery. Gutters direct this water in the direction of downspouts which steer the water flow down and away from the structure or in to sewers. Flat roof drains can be one of three main types: scuppers, inner drains or siphonic drains.

Roof Rainwater Drain Scuppes


Scuppers are located on the roof's perimeter. Scuppers can also be installed on a balcony or terrace. Small openings are cut in the side of the roof structure so rain water can empty and drain the roof top. Scuppers can attach to a downspout, or can be extended so that water is directed away from 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 places on the roof and attach to inner drainage pipes that drive water outdoors or into a sewer system. Many designs of internal roof drains have domes, strainers or covers that keep trash from obstructing the roof drain pipe. These types of drains work via gravitational force funneling standing water through the roof drain system. They are made from PVC, cast iron or cast aluminum.

Siphonic Roof Drains

Siphonic roof drains are a more effective alternative to gravity drainage. Traditional flat roof drainage permits both air and water to go into 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 which eliminates air from the system and allows for smaller sized pipe diameters . When all air is eliminated, a negative air pressure in the tail portion 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 pitched roofs.

If you need more information about flat roof drain or roof drain downspout in and around Grand Bay, Alabama, give us a call. We'd be glad to help.