Roof Drains


At this time there are several distinct varieties of roof water drains and roof drain pan in Saraland, AL and each is an unique solution to the variety of roof styles and their drainage issues. You must take into consideration the type of roof, its size, and the roof pitch to be able to pick the correct drain. You also need to think about the site of the drain, how much rainwater is expected and safety when selecting a roof drain for a home or commercial building.

Gambrel, dormers, hip and gable roofs shed water due to gravitational force. Flat roofs, conversely, accumulate water. Unless this water is directed out and away from the flat roof , it will most likely develop pools that may eventually leak and the amassed weight will subsequently result in damage to the structure. That is why roofs with a pitch of less than 2% should have roof drains positioned in the lowest spots on the roof in which water pools and need to be evenly spread all throughout the roof top.

Types of Roof Drains


There are several different alternatives of roof drains. They generally fall into two groups: pitched roof drains and flat roof drains. Pitched roof rainwater drains normally consist of gutters that collect rainwater which passes by means of gravity down to the roof edge. Gutters channel this water in the direction of downspouts which route the water flow down and far away from the building or in to sewers. Flat roof drains are 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 put in on a balcony or terrace. Small holes are cut into the side of the roof structure so rain water can flow out and drain the roof top. Scuppers can connect to a downspout, or can be extended to make sure that water is guided off of the building sides and foundation.

Inner Roof Drains


There are many types of inner drains for flat roofs. These are positioned at low areas on the roof and attach to interior drainage pipes that drive water outside or into a sewer system. Many styles of internal roof drains have domes, strainers or covers that prevent debris from blocking the roof drain pipe. These kinds of drains operate via gravitational force funneling standing water thru the roof drain system. They are made 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 allows both air and water to enter the drain system creating pipe space which is occupied by both air and water. By incorporating an engineered baffle to the sump of the drain system 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 draws water off the roof siphonically. Although used primarily 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 Saraland, Alabama, give us a call. We'd be glad to help.