Roof Drains


At this time there are a few distinct kinds of roof water drains and roof drain strainer in Gardendale, AL and each is an unique approach to the variety of roof styles and their drainage challenges. You must consider the kind of roof, its dimensions, and the roof pitch to be able to select the right drain. You also may want to take into consideration the location of the drain, how much rainwater is expected and safe practices when choosing a roof drain for a home or commercial building.

Hip roofs, dormers, gable and mansard roofs shed water due to gravitational force. Flat roofs, alternatively, collect rain water. Unless the water is guided out and away from the roof structure, it will develop pools that could inevitably leak and the accumulated weight may subsequently cause damage to the structure. That is why roofs with a slope of less than two percent ought to have roof drains located at the lowest places on the roof where water pools and should be evenly spread throughout the roof surface.

Roof Drain Types


There are several different alternatives of roof drains. They basically fall into 2 categories: pitched roof drains and flat roof drains. Pitched roof rainwater drains usually comprise gutters that accumulate rainwater which passes via gravity to the roof periphery. Gutters transport this water in the direction of downspouts which route the water flow down and far away from the building or into sewers. Flat roof drains are one of three primary types: scuppers, inner drains or siphonic drains.

Roof Drain Scuppers


Scuppers are situated on a roof's periphery. They can also be installed on a balcony or terrace. Small openings are cut in the side of the roof structure so that rain water can flow out and drain the roof surface. Scuppers can attach to a downspout, or could be lengthened so that water is directed off of the structure sides and foundation.

Inner Roof Drains


There are quite a few different types of inner drains for flat roofs. These are installed at low spots on the roof and attach to interior drainage pipes that direct water outside or into a sewer system. Several models of internal roof drains have domes, strainers or covers that prevent debris from clogging the roof drain pipe. These types of drains work via gravity channeling pooling water thru the roof drain system. They can be constructed 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 enter 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 removes air from the system and permits smaller pipe diameters . When all of the air is removed, a negative air pressure in the tail portion of the drain is established which attracts 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 strainer in and around Gardendale, Alabama, give us a call. We'd be glad to help.