Roof Drains


There are several different varieties of roof water drains and roof drain pan in Pelham, AL and each is a specific solution to the variety of roof styles and their drainage concerns. You must consider the type of roof, its dimensions, and its roof pitch to be able to choose the correct drain. You also should take into consideration the site of the drain, what amount of rainwater is anticipated and safety when selecting a roof water drain for a home or business building.

Gable, dormer, mansard and hip roofs shed rainwater water because of gravitational force. Flat roofs, alternatively, accumulate rain water. Until the water is routed out and away from the flat roof structure, it will most likely create pools of water that could eventually leak and the amassed weight may subsequently result in damage to the structure. That is the reason that roofs with a pitch of below two percent ought to have roof drains positioned at the lowest spots on the roof in which water puddles and need to be uniformly spaced throughout the roof top.

Types of Roof Drains


There are a number of different variations of roof drains. They generally fall into two groups: pitched roof drains and flat roof drains. Pitched roof drains usually consist of gutters which collect rainwater which travels via gravity down to the roof periphery. Gutters direct this water towards downspouts which steer the water flow down and away from the building or in to sewers. Flat roof drains are one of three main 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 into the side of the roof structure so that water can flow out and drain the roof surface. Scuppers can hook up to a downspout, or can be extended to make sure that water is guided off of the structure sides and foundation.

Interior Roof Drains


There are many kinds of inner drains for flat roofs. These are installed at low spots on the roof and connect to inner drainage pipes that drive water outdoors or into a sewer system. Several models of inner roof drains have domes, strainers or covers that prevent trash from clogging the roof drain pipe. These kinds of drains work via gravity channeling standing water thru 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. Standard flat roof drainage allows both air and water to enter 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 body it creates a siphonic drain that removes air from the system and permits smaller sized pipe diameters . When all of the air is eliminated, a negative air pressure in the tail piece of the drain is established which draws 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 pan in and around Pelham, Alabama, give us a call. We'd be glad to help.