Roof Drains


There are a few distinct kinds of roof drains and roof drain cover in Hartselle, AL and each is an unique answer to the variety of roof styles and their drainage challenges. You must think about the kind of roof, its dimensions, and the roof pitch to be able to select the right drain. You also should take into account the site of the drain, how much rainwater is expected and safety when choosing a roof drain for a house or commercial structure.

Gambrel, dormers, hip and gable roofs shed water because of gravity. Flat roofs, on the other hand, collect water. Unless the water is routed out and away from the roof , it will most likely develop pools that may inevitably leak and the accumulated weight will eventually cause compromising the integrity of the structure. That is the reason that roofs with a pitch of below 2% should have roof drains positioned in the lowest spots on the roof where water pools and need to be uniformly spread throughout the roof surface.

Kinds of Roof Drains


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 normally comprise gutters which collect rainwater which travels by means of gravity to the roof periphery. Gutters direct this water towards downspouts which route the water flow down and away from the structure or in to sewers. Flat roof drains can be one of three main types: scuppers, inner drains or siphonic drains.

Roof Rainwater Drain Scuppes


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

Inner Roof Drains


There are many kinds of inner drains for flat roofs. They are installed at low places on the roof and connect to inner drainage pipes that direct water outdoors or into a sewer system. Many versions of internal roof drains have domes, strainers or covers which prevent debris from obstructing the roof drain pipe. These types of drains operate via gravity channeling pooling water through the roof drain system. They are constructed from PVC, cast iron or cast aluminum.

Siphonic Roof Drains

Siphonic roof drains are a more effective substitute for gravity drainage. Conventional flat roof drainage permits both air and water to enter the drain system creating pipe space occupied by both air and water. By incorporating an engineered baffle to the sump of the drain body it produces a siphonic drain that removes air from the system and allows for smaller sized pipe diameters to be used. When all air is eliminated, a negative air pressure in the tail piece of the drain is set up which attracts 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 cover in and around Hartselle, Alabama, give us a call. We'd be glad to help.