There are a few distinct varieties of roof drains and roof drain pan in Hartselle, AL and each one is an unique approach to the wide range of roof types and their drainage issues. You should look at the kind of roof, its dimensions, and the roof pitch to be able to choose the right drain. You also need to take into account the site of the drain, how much rainwater is expected and safety when choosing a roof water drain for a residence or commercial building. Gable, dormer, mansard and hip roofs shed rainwater water thanks to gravitational force. Flat roofs, alternatively, collect water. Unless the water is routed out and away from the flat roof structure, it will develop pools that may inevitably leak and the accumulated weight may eventually result in compromising the integrity of the structure. That is why roofs with a slope of below 2% ought to have roof drains situated at the lowest places on the roof where water puddles and need to be evenly spaced throughout the roof top.
Types of Roof Drains
There are several different alternatives of roof drains. They basically fall into two categories: pitched roof drains and flat roof drains. Pitched roof drains usually consist of gutters that collect rainwater which passes by means of gravity down to the roof periphery. Gutters direct this water in the direction of downspouts which direct the water flow down and away from the structure or into sewer lines. Flat roof drains are one of three primary types: scuppers, inner drains or siphonic drains.
Roof Drain Scuppers
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 rain water can empty and drain the roof top. Scuppers can attach to a downspout, or could be lengthened so that water is guided away from the building sides and foundation.
Interior Roof Drains
There are quite a few different types of inner drains for flat roofs. They are installed at low spots in the roof and connect to interior drainage pipes that route water outdoors or in to a sewer system. Many versions of inner roof drains have domes, strainers or covers which prevent trash from clogging the roof drain pipe. These kinds of drains operate via gravity funneling standing water through the roof drain system. They are made of PVC, cast iron or cast aluminum.
Siphonic Roof DrainsSiphonic 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 system it produces a siphonic drain which eliminates air from the system and permits smaller sized pipe diameters . When all air is removed, a negative air pressure in the tail piece of the drain is established which pulls rainwater 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 pan in and around Hartselle, Alabama, give us a call. We'd be glad to help.