Roof Drains


There are a number of different kinds of roof drains and roof drain scupper in Montevallo, AL and each is a specific answer to the wide range of roof styles and their drainage challenges. You need to think about the kind of roof, its dimensions, and the roof pitch to be able to choose the correct drain. You also should take into account the site of the drain, how much rainwater is expected and safe practices when selecting a roof water drain for a house or business building.

Gambrel, dormers, hip and gable roofs shed rainwater water because of gravitational force. Flat roofs, alternatively, collect rain water. Unless the water is routed out and away from the roof structure, it will most likely create pools of water that may eventually leak and the accumulated weight will subsequently result in compromising the integrity of the structure. That is why roofs with a pitch of less than 2% ought to have roof drains located in the lowest places on the roof where water puddles 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 categories: pitched roof drains and flat roof drains. Pitched roof rainwater drains normally comprise gutters that collect rainwater which passes by means of gravity down to the roof periphery. Gutters channel this water towards downspouts which route the water flow down and far away from the building or into sewers. Flat roof drains are one of three primary types: scuppers, inner drains or siphonic drains.

Roof Rainwater Drain Scuppes


Scuppers are situated on the roof's periphery. They can also be installed 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 could be extended so that water is guided away from the structure sides and foundation.

Interior Roof Drains


There are quite a few different types of inner drains for flat roofs. These are installed at low areas in the roof and connect to interior drainage pipes that direct water outside or into a sewer system. Many designs of internal roof drains have domes, strainers or covers that keep debris from clogging the roof drain pipe. These types of drains work via gravity funneling standing water through the roof drain system. They are made of PVC, cast iron or cast aluminum.

Siphonic Roof Drains

Siphonic roof drains are a more effective alternative to gravity drainage. Standard flat roof drainage allows both air and water to enter the drain system producing pipe space occupied by both air and water. By incorporating an engineered baffle to the sump of the drain body it creates a siphonic drain that removes air from the system and permits smaller pipe diameters . When all of the 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 primarily for flat roofs, siphonic drains can also be installed on angled roofs.

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