Roof Drains


There are several distinct types of roof water drains and roof drain dome in Grand Bay, AL and each is a specific answer to the variety of roof styles and their drainage challenges. You should consider the kind of roof, its size, and its roof pitch to be able to choose the most suitable drain. You also should think about the location of the drain, what amount of rainwater is anticipated and safe practices when choosing a roof water drain for a residence or commercial structure.

Gable, dormer, mansard and hip roofs shed rainwater water thanks to gravity. Flat roofs, on the other hand, collect rain water. Unless the water is routed out and away from the flat roof structure, it will most likely develop pools of water that could eventually leak and the accumulated weight will subsequently result in damage to the structure. That is why roofs with a pitch of less than 2% ought to have roof drains located in the lowest areas on the roof where water pools and need to be uniformly spread all throughout the roof top.

Types 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 drains usually comprise gutters that collect rainwater that travels by means of gravity down to the roof edge. Gutters channel this water in the direction of downspouts which route the water flow down and away from the structure or in to sewers. Flat roof drains can be one of three main types: scuppers, inner drains or siphonic drains.

Roof Drain Scuppers


Scuppers are situated 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 rain water can empty and drain the roof top. Scuppers can connect to a downspout, or can be lengthened to make sure that water is directed off of the structure sides and foundation.

Inner Roof Drains


There are many kinds of inner drains for flat roofs. They are positioned at low areas on the roof and attach to interior drainage pipes that direct water outside or in to a sewer system. Several models of inner roof drains have domes, strainers or covers which keep debris from obstructing the roof drain pipe. These kinds of drains work via gravity 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 effective substitute for gravity drainage. Traditional flat roof drainage allows both air and water to enter the drain system producing pipe space occupied by both air and water. By adding an engineered baffle to the sump of the drain system it creates a siphonic drain that eliminates air from the system and allows for smaller sized pipe diameters to be used. When all air is removed, a negative air pressure in the tail piece of the drain is set up which draws water off the roof siphonically. Although 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 dome in and around Grand Bay, Alabama, give us a call. We'd be glad to help.