Roof Drains


At this time there are several different varieties of roof water drains and roof drain strainer in Montgomery, AL and each is an unique answer to the variety of roof types and their drainage concerns. You need to take into consideration the kind of roof, its dimensions, and the roof pitch to be able to select the most suitable drain. You also need to take into account the location of the drain, how much rainwater is anticipated and safe practices when choosing a roof water drain for a home or commercial structure.

Gable, dormer, mansard and hip roofs shed rainwater water due to gravity. Flat roofs, on the other hand, accumulate rain water. Unless this water is guided out and away from the flat roof , it will most likely develop pools of water that may inevitably leak and the accumulated weight will eventually result in structural damage. That is the reason that roofs with a slope of below 2% should have roof drains situated in the lowest areas on the roof in which water puddles and should be uniformly spaced throughout the roof surface.

Roof Drain Kinds


There are a number of different alternatives of roof drains. They basically fall into 2 categories: flat roof drains and pitched roof drains. Pitched roof rainwater drains normally comprise gutters which collect rainwater that travels by means of gravity down to the roof edge. Gutters direct this water in the direction of downspouts which steer the water flow down and far away from the building or into sewers. Flat roof drains can be one of three main types: scuppers, inner drains or siphonic drains.

Roof Rainwater Drain Scuppes


Scuppers are located on the roof's periphery. Scuppers 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 flow out 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.

Interior Roof Drains


There are quite a few different kinds of inner drains for flat roofs. They are installed at low areas on the roof and connect to interior drainage pipes that drive water outside or in to a sewer system. Many models of internal roof drains have domes, strainers or covers that keep debris from obstructing the roof drain pipe. These types of drains operate via gravitational force funneling standing water through 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 alternative to gravity drainage. Conventional flat roof drainage permits both air and water to go into the drain system creating 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 . When all of the air is removed, a negative air pressure in the tail piece of the drain is established which draws water off the roof siphonically. Though 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 strainer in and around Montgomery, Alabama, give us a call. We'd be glad to help.