Roof Drains


There are several distinct kinds of roof drains and roof drain strainer in Moulton, AL and each one is an unique approach to the wide range of roof styles and their drainage issues. You must think about the kind of roof, its dimensions, and the roof pitch to be able to choose the correct drain. You also may want to take into consideration the site of the drain, what amount of rainwater is expected and safety when selecting a roof water drain for a house or commercial building.

Gambrel, dormers, hip and gable roofs shed water due to gravitational force. Flat roofs, conversely, accumulate water. Until this water is directed out and away from the flat roof , it will create pools that could inevitably leak and the accumulated weight will subsequently cause structural damage. That is why roofs with a pitch of under 2% should have roof drains situated in the lowest places on the roof in which water pools and need to be evenly spaced all throughout the roof surface.

Roof Drain Types


There are several different alternatives of roof drains. They generally fall into two categories: flat roof drains and pitched roof drains. Pitched roof rainwater drains usually comprise gutters which collect rainwater which passes via gravity to the roof periphery. Gutters direct this water in the direction of downspouts which steer the water flow down and far away from the structure or in to sewers. Flat roof drains are one of three primary types: scuppers, inner drains or siphonic drains.

Roof Rainwater Drain Scuppes


Scuppers are located on a roof's periphery. Scuppers can also be installed on a balcony or terrace. Small openings are cut into the side of the roof structure so water can empty and drain the roof top. Scuppers can attach to a downspout, or can be lengthened so that water is guided off of the structure sides and foundation.

Interior Roof Drains


There are many types of inner drains for flat roofs. These are installed at low areas in the roof and connect to interior drainage pipes that route water outside or into a sewer system. Several styles of internal roof drains have domes, strainers or covers which keep debris from clogging the roof drain pipe. These kinds of drains operate via gravitational force funneling 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 efficient substitute for gravity drainage. Traditional flat roof drainage permits 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 produces a siphonic drain that removes air from the system and allows for smaller sized pipe diameters . When all air is removed, a negative air pressure in the tail piece of the drain is set up which attracts 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 strainer in and around Moulton, Alabama, give us a call. We'd be glad to help.