Roof Drains


At this time there are a few distinct types of roof water drains and roof drain pipe in Pelham, AL and each is a specific answer to the variety of roof types and their drainage issues. You should 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, 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 water due to gravity. Flat roofs, alternatively, collect water. Unless the water is routed out and away from the roof structure, it will most likely create pools that may eventually leak and the accumulated weight will subsequently result in damage to the structure. That is why roofs with a pitch of under two percent ought to have roof drains situated in the lowest places on the roof in which water pools and should be evenly spread all throughout the roof surface.

Kinds of Roof Drains


There are a number of distinct alternatives of roof drains. They generally fall into two categories: flat roof drains and pitched roof drains. Pitched roof rainwater drains usually consist of gutters that accumulate rainwater that passes via gravity to the roof periphery. Gutters transport this water in the direction of downspouts which direct the water flow down and far away from the structure or into sewer lines. Flat roof drains are one of three main types: scuppers, inner drains or siphonic drains.

Roof Rainwater Drain Scuppes


Scuppers are located on the roof's perimeter. They can also be placed on a balcony or terrace. Small holes are cut in the side of the roof structure so rain water can empty and drain the roof surface. Scuppers can connect to a downspout, or can be lengthened to make sure that water is directed off of the building sides and foundation.

Inner Roof Drains


There are quite a few different kinds of inner drains for flat roofs. They are installed at low areas in the roof and connect to interior drainage pipes that drive water outside or in to a sewer system. Several styles of inner roof drains have domes, strainers or covers that keep debris from clogging the roof drain pipe. These kinds of drains work via gravitational force funneling pooling 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 efficient substitute for gravity drainage. Traditional flat roof drainage permits both air and water to enter the drain system producing pipe space which is occupied by both air and water. By adding an engineered baffle to the sump of the drain body it produces a siphonic drain which removes air from the system and allows for smaller sized pipe diameters to be used. When all of the air is eliminated, a negative air pressure in the tail piece of the drain is set up which pulls rainwater off the roof siphonically. Though used primarily for flat roofs, siphonic drains can also be set up on angled roofs.

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