Roof Drains


There are a number of different varieties of roof drains and roof drain scupper in Pelham, AL and each is a specific approach to the variety of roof styles and their drainage concerns. You need to look at the type of roof, its dimensions, and the roof pitch to be able to pick the most suitable drain. You also should take into consideration the site of the drain, how much rainwater is expected and safe practices when selecting a roof water drain for a residence or business building.

Gable, dormer, mansard and hip roofs shed rainwater water due to gravitational force. Flat roofs, conversely, collect water. Until the water is directed out and away from the flat roof , it will most likely develop pools of water that may inevitably leak and the amassed weight will subsequently cause damage to the structure. That is the reason that roofs with a slope of less than two percent ought to have roof drains located at the lowest spots on the roof in which water pools and should be evenly spread all throughout the roof top.

Roof Drain Types


There are several different alternatives of roof drains. They generally fall into two groups: pitched roof drains and flat roof drains. Pitched roof rainwater drains normally comprise gutters which collect rainwater that passes via gravity down to the roof edge. Gutters direct this water in the direction of downspouts which steer the water flow down and away from the building or into sewers. Flat roof drains can be one of three primary types: scuppers, inner drains or siphonic drains.

Roof Rainwater Drain Scuppes


Scuppers are situated on a roof's perimeter. Scuppers can also be installed on a balcony or terrace. Small openings are cut into the side of the roof structure so that water can empty and drain the roof surface. Scuppers can hook up to a downspout, or can be extended so that water is guided off of the building sides and foundation.

Inner Roof Drains


There are many types of inner drains for flat roofs. They are positioned at low spots on the roof and connect to inner drainage pipes that route water outdoors or into a sewer system. Several versions of internal roof drains have domes, strainers or covers that prevent trash from blocking the roof drain pipe. These types of drains work via gravity funneling pooling water through the roof drain system. They can be made of PVC, cast iron or cast aluminum.

Siphonic Roof Drains

Siphonic roof drains are a more efficient alternative to gravity drainage. Traditional flat roof drainage allows both air and water to enter 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 that removes air from the system and allows for 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 draws water off the roof siphonically. Though used primarily for flat roofs, siphonic drains can also be installed on angled roofs.

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