Roof Drains


At this time there are a number of distinct types of roof drains and roof drain cover in Dothan, AL and each one is an unique approach to the wide range of roof styles and their drainage issues. You need to consider the type of roof, its dimensions, and its roof pitch to be able to select the correct drain. You also may want to think about the location of the drain, how much rainwater is expected and safety when choosing a roof water drain for a house or business structure.

Hip roofs, dormers, gable and mansard roofs shed rainwater water due to gravitational force. Flat roofs, on the other hand, accumulate rain water. Unless the water is routed out and away from the flat roof structure, it will most likely create pools of water that could inevitably leak and the amassed weight may subsequently result in compromising the integrity of the structure. That is the reason that roofs with a pitch of under two percent ought to have roof drains positioned in the lowest areas on the roof where water puddles and should be uniformly spread all throughout the roof top.

Kinds of Roof Drains


There are several different variations of roof drains. They basically fall into 2 categories: pitched roof drains and flat roof drains. Pitched roof rainwater drains usually comprise gutters that collect rainwater which travels via gravity down to the roof periphery. Gutters transport this water in the direction of downspouts which route the water flow down and 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 situated on a roof's periphery. They can also be installed on a balcony or terrace. Small holes are cut into the side of the roof structure so water can flow out and drain the roof top. Scuppers can hook up to a downspout, or could be lengthened to make sure that water is directed away from the structure sides and foundation.

Inner Roof Drains


There are many types of inner drains for flat roofs. They are positioned at low places on the roof and attach to inner drainage pipes that drive water outside or in to a sewer system. Several styles of internal roof drains have domes, strainers or covers which keep trash from blocking the roof drain pipe. These types of drains operate via gravitational force funneling standing 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 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 system it produces a siphonic drain that eliminates air from the system and allows for smaller sized pipe diameters to be used. When all of the air is eliminated, a negative air pressure in the tail piece of the drain is established 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 cover in and around Dothan, Alabama, give us a call. We'd be glad to help.