Roof Drains


There are several different kinds of roof drains and roof drain dome in Harvest, AL and each is an unique answer to the variety of roof styles and their drainage challenges. You should consider the type of roof, its size, and its roof pitch to be able to choose the most suitable drain. You also should think about the site of the drain, what amount of rainwater is expected and safe practices when choosing a roof water drain for a home or commercial building.

Hip roofs, dormers, gable and mansard roofs shed rainwater water due to gravity. Flat roofs, on the other hand, collect rain water. Unless this water is routed out and away from the roof , it will develop pools that may eventually leak and the accumulated weight will subsequently cause compromising the integrity of the structure. That is why roofs with a pitch of less than 2% ought to have roof drains positioned in the lowest spots on the roof in which water pools and need to be uniformly spread throughout the roof top.

Kinds of Roof Drains


There are a number of different variations of roof drains. They generally fall into two groups: flat roof drains and pitched roof drains. Pitched roof drains normally consist of gutters that accumulate rainwater that passes via gravity to the roof periphery. Gutters channel this water in the direction of downspouts which direct the water flow down and far away from the structure or into sewers. Flat roof drains are one of three primary types: scuppers, inner drains or siphonic drains.

Roof Rainwater Drain Scuppes


Scuppers are located on the roof's perimeter. Scuppers can also be put in on a balcony or terrace. Small holes are cut into the side of the roof structure so that water can empty and drain the roof surface. Scuppers can connect to a downspout, or could be extended so 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 attach to interior drainage pipes that drive water outside or in to a sewer system. Many designs of internal roof drains have domes, strainers or covers which keep trash from blocking the roof drain pipe. These types of drains operate via gravity funneling standing water thru the roof drain system. They can be constructed from PVC, cast iron or cast aluminum.

Siphonic Roof Drains

Siphonic roof drains are a more efficient alternative to gravity drainage. Standard flat roof drainage permits both air and water to enter the drain system creating pipe space which is occupied by both air and water. By incorporating an engineered baffle to the sump of the drain system it creates a siphonic drain which eliminates air from the system and permits smaller pipe diameters . When all air is eliminated, 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 set up on angled roofs.

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