Roof Drains


There are a number of distinct varieties of roof drains and roof drain dome in Gardendale, AL and each one is an unique approach to the wide range of roof types and their drainage issues. You should take into consideration the type of roof, its size, and the roof pitch to be able to choose the correct drain. You also should take into account the site of the drain, what amount of rainwater is expected and safety when selecting a roof drain for a house or business structure.

Gable, dormer, mansard and hip roofs shed rainwater water because of gravity. Flat roofs, on the other hand, collect rain water. Until this water is guided out and away from the flat roof , it will develop pools of water that could eventually leak and the accumulated weight will eventually result in structural damage. That is the reason that roofs with a pitch of less than 2% should have roof drains positioned at the lowest places on the roof in which water puddles and need to be uniformly spread throughout the roof surface.

Roof Drain Kinds


There are several different variations of roof drains. They generally fall into 2 categories: pitched roof drains and flat roof drains. Pitched roof rainwater drains usually consist of gutters which collect rainwater that passes via gravity down to the roof periphery. Gutters channel this water in the direction of downspouts which direct the water flow down and far 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 the roof's perimeter. They can also be placed on a balcony or terrace. Small openings 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 can be lengthened so that water is guided off of the structure sides and foundation.

Interior Roof Drains


There are quite a few different types of inner drains for flat roofs. They are installed at low areas on the roof and attach to interior drainage pipes that route water outside or in to a sewer system. Many models of inner roof drains have domes, strainers or covers which prevent trash from clogging the roof drain pipe. These types of drains work via gravity funneling pooling water thru the roof drain system. They are 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 permits both air and water to go into the drain system producing pipe space occupied by both air and water. By incorporating an engineered baffle to the sump of the drain system it creates a siphonic drain that removes air from the system and permits smaller sized pipe diameters . When all of the air is removed, a negative air pressure in the tail portion of the drain is set up which draws water off the roof siphonically. Though used mainly for flat roofs, siphonic drains can also be installed on pitched roofs.

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