Roof Drains


There are a number of distinct types of roof water drains and roof drain strainer in Opelika, AL and each one is an unique solution to the wide range of roof types and their drainage challenges. You must take into consideration the type of roof, its size, and its roof pitch to be able to select the most suitable drain. You also need to think about the site of the drain, what amount of rainwater is expected and safe practices when choosing a roof drain for a house or commercial building.

Hip roofs, dormers, gable and mansard roofs shed water because of gravity. Flat roofs, alternatively, accumulate rain water. Until the water is guided out and away from the flat roof structure, it will most likely develop pools of water that could eventually leak and the accumulated weight will eventually cause damage to the structure. That is the reason that roofs with a pitch of below 2% should have roof drains situated in the lowest places on the roof in which water pools and need to be evenly spread all throughout the roof surface.

Kinds of Roof Drains


There are a number of distinct variations of roof drains. They generally fall into 2 groups: flat roof drains and pitched roof drains. Pitched roof drains usually consist of gutters that collect rainwater that passes by means of gravity to the roof periphery. Gutters direct this water towards downspouts which direct the water flow down and far away from the structure or into sewer lines. Flat roof drains are one of three primary types: scuppers, inner drains or siphonic drains.

Roof Drain Scuppers


Scuppers are situated on the roof's periphery. They can also be placed on a balcony or terrace. Small holes are cut into the side of the roof structure so water can flow out and drain the roof top. Scuppers can hook up to a downspout, or can be extended so that water is directed 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 places on the roof and connect to inner drainage pipes that drive water outdoors or in to a sewer system. Many designs of internal roof drains have domes, strainers or covers which keep debris from obstructing the roof drain pipe. These kinds of drains work 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 alternative to gravity drainage. Traditional flat roof drainage allows both air and water to enter the drain system creating pipe space occupied by both air and water. By adding an engineered baffle to the sump of the drain system it creates a siphonic drain that removes air from the system and permits smaller sized pipe diameters . When all air is eliminated, a negative air pressure in the tail piece of the drain is established which pulls rainwater off the roof siphonically. Though 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 Opelika, Alabama, give us a call. We'd be glad to help.