Roof Drains


There are several distinct kinds of roof water drains and roof drain pipe in Grand Bay, AL and each is a specific approach to the variety of roof types and their drainage concerns. You need to think about the type of roof, its dimensions, and the roof pitch to be able to pick the right drain. You also need to take into account the location of the drain, what amount of rainwater is expected and safety when selecting a roof water drain for a home or business structure.

Gable, dormer, mansard and hip roofs shed water due to gravity. Flat roofs, alternatively, collect rain water. Until this water is directed out and away from the flat roof , it will create pools of water that may inevitably leak and the amassed weight will eventually result in damage to the structure. That is why roofs with a slope of below 2% should have roof drains located at the lowest places on the roof in which water pools and need to be evenly spread all throughout the roof top.

Roof Drain Kinds


There are several different alternatives of roof drains. They basically fall into two groups: flat roof drains and pitched roof drains. Pitched roof drains normally comprise gutters which accumulate rainwater that travels via gravity to the roof edge. Gutters channel this water towards downspouts which route the water flow down and far away from the structure or in to sewer lines. Flat roof drains are one of three main types: scuppers, inner drains or siphonic drains.

Roof Rainwater Drain Scuppes


Scuppers are located on a roof's perimeter. They can also be installed on a balcony or terrace. Small holes are cut into the side of the roof structure so that rain water can empty and drain the roof surface. Scuppers can hook up to a downspout, or could be extended so that water is guided away from the building sides and foundation.

Inner Roof Drains


There are many kinds of inner drains for flat roofs. These are positioned at low spots on the roof and attach to interior drainage pipes that drive water outdoors or in to a sewer system. Several designs of internal roof drains have domes, strainers or covers that keep trash from blocking the roof drain pipe. These types of drains work via gravity funneling pooling water through the roof drain system. They can be constructed from PVC, cast iron or cast aluminum.

Siphonic Roof Drains

Siphonic roof drains are a more effective alternative to gravity drainage. Conventional flat roof drainage permits 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 body it produces a siphonic drain which removes air from the system and permits smaller pipe diameters . When all air is eliminated, a negative air pressure in the tail piece of the drain is established which attracts water 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 pipe in and around Grand Bay, Alabama, give us a call. We'd be glad to help.