Roof Drains


There are a number of different types of roof drains and roof drain strainer in Madison, AL and each one is an unique solution to the variety of roof styles and their drainage concerns. You need to look at the kind of roof, its dimensions, and the roof pitch to be able to select the most suitable drain. You also may want to take into consideration the site of the drain, how much rainwater is anticipated and safe practices when choosing a roof water drain for a residence or business structure.

Gable, dormer, mansard and hip roofs shed rainwater water thanks to gravity. Flat roofs, conversely, accumulate rain water. Until this water is guided out and away from the roof , it will create pools of water that could eventually leak and the amassed weight may subsequently result in structural damage. That is the reason that roofs with a pitch of under two percent should have roof drains located in the lowest spots on the roof where water pools and should be evenly spread throughout the roof surface.

Roof Drain Kinds


There are a number of different variations of roof drains. They generally fall into 2 groups: pitched roof drains and flat roof drains. Pitched roof rainwater drains usually consist of gutters which accumulate rainwater that passes via gravity to the roof periphery. Gutters channel this water in the direction of downspouts which steer the water flow down and away from the building or in to sewers. Flat roof drains are one of three main types: scuppers, inner drains or siphonic drains.

Roof Rainwater Drain Scuppes


Scuppers are located on the roof's perimeter. They can also be put in on a balcony or terrace. Small openings are cut in the side of the roof structure so water can empty and drain the roof top. Scuppers can attach 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 types of inner drains for flat roofs. These are installed at low spots on the roof and attach to inner drainage pipes that drive water outside or into a sewer system. Several versions of inner roof drains have domes, strainers or covers that keep debris from blocking the roof drain pipe. These types of drains operate via gravity channeling standing 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. Traditional flat roof drainage permits both air and water to go into the drain system creating pipe space which is occupied by both air and water. By incorporating an engineered baffle to the sump of the drain body it produces a siphonic drain which removes air from the system and allows for smaller pipe diameters . When all air is removed, a negative air pressure in the tail piece of the drain is established which attracts rainwater off the roof siphonically. Though used mainly for flat roofs, siphonic drains can also be installed on angled roofs.

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