Roof Drains


There are a number of different kinds of roof drains and roof drain strainer in Piedmont, AL and each is a specific answer to the wide range of roof types and their drainage issues. You need to think about the kind of roof, its dimensions, and its roof pitch to be able to pick the right drain. You also may want to take into consideration the site of the drain, how much rainwater is expected and safe practices when selecting a roof water drain for a residence or commercial building.

Gable, dormer, mansard and hip roofs shed rainwater water because of gravitational force. Flat roofs, on the other hand, accumulate rain water. Until this water is guided out and away from the flat roof structure, it will most likely create pools of water that could inevitably leak and the accumulated weight may subsequently cause structural damage. That is the reason that roofs with a slope of under two percent ought to have roof drains positioned at the lowest places on the roof where water pools and should be evenly spaced throughout the roof surface.

Kinds of Roof Drains


There are several different alternatives of roof drains. They generally fall into two groups: pitched roof drains and flat roof drains. Pitched roof rainwater drains normally comprise gutters which accumulate rainwater that travels by means of gravity down to the roof edge. Gutters direct 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 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. They can also be installed on a balcony or terrace. Small holes are cut into the side of the roof structure so water can empty and drain the roof surface. Scuppers can connect to a downspout, or can be extended so that water is guided off of the building sides and foundation.

Interior Roof Drains


There are many types of inner drains for flat roofs. They are installed at low areas on the roof and attach to inner drainage pipes that direct water outside or into a sewer system. Several models of internal roof drains have domes, strainers or covers that prevent debris from obstructing the roof drain pipe. These kinds of drains work via gravitational force funneling pooling water through the roof drain system. They can be made from PVC, cast iron or cast aluminum.

Siphonic Roof Drains

Siphonic roof drains are a more efficient alternative to gravity drainage. Traditional 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 adding an engineered baffle to the sump of the drain body it produces a siphonic drain which eliminates 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. Although used mainly for flat roofs, siphonic drains can also be set up on pitched roofs.

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