Roof Drains


There are a number of different types of roof drains and roof drain downspout in Harvest, AL and each one is a specific approach to the variety of roof types and their drainage concerns. You need to consider the type of roof, its dimensions, and the roof pitch to be able to choose the most suitable drain. You also should take into account the location of the drain, how much rainwater is anticipated and safe practices when choosing a roof drain for a residence or commercial structure.

Hip roofs, dormers, gable and mansard roofs shed rainwater water because of gravity. Flat roofs, alternatively, collect rain water. Until this water is routed out and away from the flat roof , it will develop pools that may eventually leak and the amassed weight may eventually result in damage to the structure. That is why roofs with a pitch of under 2% should have roof drains positioned at the lowest spots on the roof in which water pools and should be uniformly spaced throughout the roof surface.

Roof Drain Kinds


There are several different variations of roof drains. They basically fall into two groups: flat roof drains and pitched roof drains. Pitched roof drains normally comprise gutters which collect rainwater that travels by means of gravity to the roof edge. Gutters transport this water in the direction of downspouts which direct the water flow down and far away from the structure or into sewers. Flat roof drains can be one of three primary types: scuppers, inner drains or siphonic drains.

Roof Drain Scuppers


Scuppers are situated on a roof's periphery. Scuppers can also be put in 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 surface. Scuppers can hook up to a downspout, or could be extended so that water is guided off of the building sides and foundation.

Inner Roof Drains


There are many kinds of inner drains for flat roofs. They are positioned at low places on the roof and connect to interior drainage pipes that route water outdoors or in to a sewer system. Many versions of internal roof drains have domes, strainers or covers which prevent debris from obstructing the roof drain pipe. These kinds of drains work via gravity channeling standing water through the roof drain system. They can be constructed from PVC, cast iron or cast aluminum.

Siphonic Roof Drains

Siphonic roof drains are a more efficient substitute for gravity drainage. Standard flat roof drainage permits both air and water to go into the drain system creating pipe space occupied by both air and water. By incorporating an engineered baffle to the sump of the drain system it produces a siphonic drain which eliminates air from the system and permits smaller pipe diameters to be used. When all of the air is removed, a negative air pressure in the tail piece of the drain is set up which pulls water off the roof siphonically. Although used primarily for flat roofs, siphonic drains can also be installed on pitched roofs.

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