Roof Drains


There are several different varieties of roof drains and roof drain pan in Grand Bay, AL and each is a specific solution to the variety of roof types and their drainage concerns. You need to think about the type of roof, its size, and its roof pitch to be able to choose the most suitable drain. You also may want to take into account the location of the drain, what amount of rainwater is expected and safe practices when choosing a roof water drain for a home or commercial building.

Hip roofs, dormers, gable and mansard roofs shed rainwater water due to gravitational force. Flat roofs, on the other hand, collect rain water. Unless the water is guided out and away from the flat roof , it will create pools that could eventually leak and the amassed weight may eventually cause damage to the structure. That is the reason that roofs with a slope of below 2% ought to have roof drains located at the lowest places on the roof where water puddles and need to be uniformly spaced throughout the roof top.

Roof Drain Kinds


There are several different alternatives of roof drains. They basically fall into 2 categories: pitched roof drains and flat roof drains. Pitched roof rainwater drains usually comprise gutters that accumulate rainwater which passes via gravity to the roof periphery. Gutters channel this water towards downspouts which direct the water flow down and away from the structure or in to sewers. Flat roof drains can be one of three primary types: scuppers, inner drains or siphonic drains.

Roof Drain Scuppers


Scuppers are situated on a roof's periphery. They can also be installed on a balcony or terrace. Small holes are cut in the side of the roof structure so rain water can flow out and drain the roof surface. Scuppers can hook up to a downspout, or can be extended so that water is directed away from the building sides and foundation.

Inner Roof Drains


There are quite a few different types of inner drains for flat roofs. These are positioned at low places on the roof and connect to inner drainage pipes that drive water outside or into a sewer system. Many versions of internal roof drains have domes, strainers or covers which prevent debris from obstructing the roof drain pipe. These types of drains operate via gravity funneling pooling water thru the roof drain system. They are 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 go into the drain system creating 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 eliminates air from the system and allows for smaller sized pipe diameters . When all of the air is removed, a negative air pressure in the tail portion of the drain is established which attracts 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 pan in and around Grand Bay, Alabama, give us a call. We'd be glad to help.