Roof Drains


At this time there are a few different kinds of roof drains and roof drain pvc in Mobile, AL and each is an unique approach to the wide range of roof types and their drainage challenges. You should take into consideration the type of roof, its size, and its roof pitch to be able to choose the correct drain. You also need to take into consideration the location of the drain, how much rainwater is expected and safe practices when choosing a roof drain for a house or business structure.

Gambrel, dormers, hip and gable roofs shed rainwater water due to gravity. Flat roofs, alternatively, collect water. Until this water is directed out and away from the flat roof , it will create pools of water that may eventually leak and the accumulated weight may eventually result in compromising the integrity of the structure. That is why roofs with a pitch of less than 2% ought to have roof drains positioned at the lowest places on the roof where water pools and need to be evenly spaced all throughout the roof surface.

Types of Roof Drains


There are a number of different alternatives of roof drains. They generally fall into 2 categories: pitched roof drains and flat roof drains. Pitched roof rainwater drains usually consist of gutters which collect rainwater that passes via gravity down to the roof periphery. Gutters transport this water in the direction of downspouts which direct the water flow down and far away from the structure or in to sewer lines. Flat roof drains can be one of three primary types: scuppers, inner drains or siphonic drains.

Roof Rainwater Drain Scuppes


Scuppers are situated on a roof's perimeter. They can also be placed 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 could be extended to make sure 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 positioned at low areas in the roof and attach to inner drainage pipes that drive water outside or in to a sewer system. Many models of internal roof drains have domes, strainers or covers which prevent debris from obstructing the roof drain pipe. These types of drains operate via gravitational force funneling standing water through the roof drain system. They can be made of PVC, cast iron or cast aluminum.

Siphonic Roof Drains

Siphonic roof drains are a more efficient substitute for gravity drainage. Standard flat roof drainage permits 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 which removes air from the system and permits smaller pipe diameters . When all of the air is removed, a negative air pressure in the tail portion of the drain is set up which pulls water off the roof siphonically. Although 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 pvc in and around Mobile, Alabama, give us a call. We'd be glad to help.