Roof Drains


There are a few different kinds of roof drains and roof drain pipe in Attalla, AL and each one is a specific solution to the variety of roof types and their drainage challenges. You should consider the type of roof, its dimensions, and its roof pitch to be able to select the right drain. You also may want to think about the site of the drain, what amount of rainwater is anticipated and safe practices when choosing a roof water drain for a home or commercial structure.

Gambrel, dormers, hip and gable roofs shed rainwater water because of gravitational force. Flat roofs, alternatively, accumulate rain water. Until this water is directed out and away from the roof structure, it will develop pools that may inevitably leak and the accumulated weight will subsequently cause damage to the structure. That is why roofs with a pitch of less than 2% should have roof drains positioned at the lowest places on the roof where water pools and should be evenly spaced throughout the roof top.

Roof Drain Kinds


There are a number of different alternatives of roof drains. They generally fall into 2 groups: pitched roof drains and flat roof drains. Pitched roof drains normally comprise gutters which collect rainwater which passes by means of gravity to the roof edge. Gutters transport this water towards downspouts which direct the water flow down and away from the structure or in to sewers. Flat roof drains are one of three main types: scuppers, inner drains or siphonic drains.

Roof Drain Scuppers


Scuppers are located on the roof's periphery. They can also be placed on a balcony or terrace. Small holes are cut in the side of the roof structure so water can flow out and drain the roof top. Scuppers can hook up to a downspout, or could be extended so that water is directed off of the structure sides and foundation.

Inner Roof Drains


There are quite a few different kinds of inner drains for flat roofs. They are positioned at low areas on the roof and attach to inner drainage pipes that route water outdoors or in to a sewer system. Several styles of internal roof drains have domes, strainers or covers that keep trash from blocking the roof drain pipe. These types of drains operate via gravitational force 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 permits both air and water to go into the drain system producing pipe space which is occupied by both air and water. By incorporating an engineered baffle to the sump of the drain system it produces a siphonic drain which eliminates air from the system and permits smaller sized pipe diameters . When all 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 installed on pitched roofs.

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