Roof Drains


At this time there are a number of distinct varieties of roof drains and roof drain strainer in Harvest, AL and each one is a specific answer to the wide range of roof types and their drainage issues. You should take into consideration the type of roof, its size, and its roof pitch to be able to choose the correct drain. You also should take into consideration the site of the drain, how much rainwater is expected and safe practices when choosing a roof drain for a residence or business structure.

Gambrel, dormers, hip and gable roofs shed water because of gravitational force. Flat roofs, conversely, collect rain water. Until this water is directed out and away from the roof , it will most likely develop pools of water that could inevitably leak and the amassed weight will eventually cause damage to the structure. That is the reason that roofs with a pitch of below two percent should have roof drains situated at the lowest spots on the roof in which water puddles and need to be uniformly spaced all throughout the roof top.

Roof Drain Kinds


There are a number of different alternatives of roof drains. They basically fall into 2 groups: pitched roof drains and flat roof drains. Pitched roof rainwater drains usually consist of gutters that accumulate rainwater which passes by means of gravity to the roof periphery. Gutters direct this water towards downspouts which steer the water flow down and far away from the structure or in to sewer lines. Flat roof drains are one of three primary types: scuppers, inner drains or siphonic drains.

Roof Drain Scuppers


Scuppers are located on a roof's perimeter. They can also be put in on a balcony or terrace. Small holes are cut in the side of the roof structure so water can empty and drain the roof surface. Scuppers can connect to a downspout, or could be lengthened so that water is directed off of the building sides and foundation.

Interior Roof Drains


There are quite a few different kinds of inner drains for flat roofs. They are installed at low places on the roof and attach to interior drainage pipes that direct water outside or in to a sewer system. Several designs of internal roof drains have domes, strainers or covers that keep debris from blocking the roof drain pipe. These types of drains operate via gravitational force channeling pooling water through the roof drain system. They are made from PVC, cast iron or cast aluminum.

Siphonic Roof Drains

Siphonic roof drains are a more efficient substitute for gravity drainage. Conventional flat roof drainage allows both air and water to go into the drain system producing pipe space occupied by both air and water. By adding an engineered baffle to the sump of the drain system it creates a siphonic drain which removes air from the system and allows for smaller sized pipe diameters . When all air is removed, a negative air pressure in the tail portion of the drain is established which attracts rainwater off the roof siphonically. Though used mainly for flat roofs, siphonic drains can also be set up on angled roofs.

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