Roof Drains


At this time there are several different types of roof drains and cast iron roof drain in Jasper, AL and each one is a specific approach to the wide range of roof styles and their drainage challenges. You need to consider the type of roof, its dimensions, and its roof pitch to be able to select the right drain. You also need to think about the site of the drain, how much rainwater is anticipated and safe practices when choosing a roof drain for a home or business structure.

Gambrel, dormers, hip and gable roofs shed rainwater water due to gravitational force. Flat roofs, on the other hand, accumulate rain water. Until this water is routed out and away from the flat roof structure, it will most likely develop pools that could eventually leak and the accumulated weight may eventually result in damage to the structure. That is why roofs with a pitch of under 2% ought to have roof drains located at the lowest areas on the roof in which water pools and need to be uniformly spaced throughout the roof top.

Types of Roof Drains


There are a number of different alternatives of roof drains. They basically fall into 2 groups: flat roof drains and pitched roof drains. Pitched roof drains normally comprise gutters that accumulate rainwater that passes by means of gravity down to the roof edge. Gutters transport this water towards downspouts which route the water flow down and away from the building or in to sewer lines. 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 put in on a balcony or terrace. Small openings are cut into the side of the roof structure so that water can empty and drain the roof top. Scuppers can attach to a downspout, or can be lengthened so that water is guided away from the building sides and foundation.

Inner Roof Drains


There are many kinds of inner drains for flat roofs. These are positioned at low spots on the roof and connect to interior drainage pipes that drive water outdoors or into a sewer system. Many models of internal roof drains have domes, strainers or covers which keep debris from blocking the roof drain pipe. These kinds of drains operate via gravity funneling standing water through the roof drain system. They can be made 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 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 system it produces a siphonic drain that removes air from the system and allows for smaller pipe diameters . When all of the air is eliminated, a negative air pressure in the tail piece of the drain is set up which draws water off the roof siphonically. Although used mainly for flat roofs, siphonic drains can also be set up on pitched roofs.

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