Roof Drains


There are several different types of roof drains and roof drain strainer in Saraland, AL and each one is an unique answer to the variety of roof styles and their drainage concerns. You must take into consideration the type of roof, its size, and its roof pitch to be able to select the correct drain. You also may want to take into account the location of the drain, how much rainwater is anticipated and safety when choosing a roof water drain for a residence or commercial building.

Gable, dormer, mansard and hip roofs shed rainwater water because of gravity. Flat roofs, alternatively, accumulate water. Unless the water is routed out and away from the flat roof , it will create pools that could eventually leak and the amassed weight may eventually cause compromising the integrity of the structure. That is why roofs with a pitch of below two percent should have roof drains situated in the lowest spots on the roof where water pools and need to be uniformly spread all throughout the roof top.

Roof Drain Types


There are a number of distinct alternatives of roof drains. They generally fall into two groups: pitched roof drains and flat roof drains. Pitched roof drains normally comprise gutters which collect rainwater that travels by means of gravity to the roof edge. Gutters channel this water in the direction of downspouts which route the water flow down and away from the building or into sewer lines. Flat roof drains can be one of three primary types: scuppers, inner drains or siphonic drains.

Roof Drain Scuppers


Scuppers are situated on the roof's periphery. Scuppers can also be installed on a balcony or terrace. Small openings are cut into the side of the roof structure so that rain water can empty and drain the roof top. Scuppers can attach to a downspout, or could be lengthened so that water is guided off of 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 inner drainage pipes that drive water outside or in to a sewer system. Many versions of inner roof drains have domes, strainers or covers that keep debris from blocking the roof drain pipe. These types of drains operate via gravitational force funneling pooling 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 effective substitute for gravity drainage. Conventional flat roof drainage allows both air and water to go into the drain system creating pipe space which is occupied by both air and water. By adding an engineered baffle to the sump of the drain system it creates a siphonic drain that removes 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 set up which pulls water off the roof siphonically. Though used mainly for flat roofs, siphonic drains can also be installed on pitched roofs.

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