Roof Drains


There are a number of different kinds of roof water drains and roof drain dome in Northport, AL and each one is a specific answer to the variety of roof styles and their drainage challenges. You should think about the kind of roof, its dimensions, and the roof pitch to be able to pick the most suitable drain. You also should think about the location of the drain, how much rainwater is anticipated and safety when selecting a roof drain for a house or business building.

Hip roofs, dormers, gable and mansard roofs shed rainwater water thanks to gravitational force. Flat roofs, alternatively, accumulate water. Unless the water is routed out and away from the roof structure, it will create pools that may inevitably leak and the accumulated weight will eventually cause damage to the structure. That is why roofs with a pitch of less than two percent should have roof drains situated in the lowest places on the roof in which water pools and should be uniformly spread throughout the roof surface.

Kinds of Roof Drains


There are several distinct alternatives of roof drains. They generally fall into 2 groups: flat roof drains and pitched roof drains. Pitched roof rainwater drains usually consist of gutters that collect rainwater which travels by means of gravity to the roof periphery. Gutters channel this water in the direction of downspouts which route the water flow down and far away from the structure or in to sewer lines. Flat roof drains can be one of three main types: scuppers, inner drains or siphonic drains.

Roof Rainwater Drain Scuppes


Scuppers are located on the 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 could be extended to make sure that water is directed away from the building sides and foundation.

Inner Roof Drains


There are quite a few different types of inner drains for flat roofs. They are installed at low areas in the roof and attach to inner drainage pipes that direct water outside or in to a sewer system. Several models of inner roof drains have domes, strainers or covers which prevent trash from clogging the roof drain pipe. These types of drains work via gravity channeling standing water thru the roof drain system. They can be made of 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 producing pipe space which is occupied by both air and water. By incorporating an engineered baffle to the sump of the drain system it produces a siphonic drain which removes air from the system and permits 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 draws rainwater off the roof siphonically. Though used primarily 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 dome in and around Northport, Alabama, give us a call. We'd be glad to help.