Roof Drains


There are several distinct types of roof drains and roof drain cover in Florence, AL and each is an unique solution to the variety of roof styles and their drainage issues. You must take into consideration the type of roof, its dimensions, and its roof pitch to be able to pick the most suitable drain. You also need to take into account the site of the drain, how much rainwater is expected and safety when choosing a roof water drain for a residence or commercial structure.

Gambrel, dormers, hip and gable roofs shed water thanks to gravity. Flat roofs, on the other hand, collect water. Unless this water is directed out and away from the flat roof , it will create pools of water that could inevitably leak and the accumulated weight may subsequently result in damage to the structure. That is why roofs with a pitch of less than 2% should have roof drains positioned in the lowest places on the roof in which water pools and need to be evenly spaced all throughout the roof top.

Types of Roof Drains


There are several distinct alternatives of roof drains. They basically fall into 2 categories: pitched roof drains and flat roof drains. Pitched roof rainwater drains normally comprise gutters which collect rainwater that travels by means of gravity down to the roof edge. Gutters transport this water towards downspouts which route the water flow down and away from the building or in to sewers. Flat roof drains can be one of three primary types: scuppers, inner drains or siphonic drains.

Roof Drain Scuppers


Scuppers are located on a roof's perimeter. Scuppers can also be installed on a balcony or terrace. Small holes are cut into the side of the roof structure so that water can flow out and drain the roof top. Scuppers can connect to a downspout, or can be extended so that water is guided away from 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 spots in the roof and attach to inner drainage pipes that route water outdoors or into a sewer system. Several models of internal roof drains have domes, strainers or covers that prevent trash from obstructing the roof drain pipe. These kinds of drains operate via gravity channeling standing water thru the roof drain system. They are constructed from PVC, cast iron or cast aluminum.

Siphonic Roof Drains

Siphonic roof drains are a more effective alternative to gravity drainage. Traditional flat roof drainage permits both air and water to enter the drain system producing pipe space occupied by both air and water. By adding an engineered baffle to the sump of the drain body it creates a siphonic drain which removes air from the system and allows for smaller sized pipe diameters to be used. When all of the air is eliminated, a negative air pressure in the tail portion of the drain is set up which draws rainwater off the roof siphonically. Though 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 Florence, Alabama, give us a call. We'd be glad to help.