Roof Drains


There are a number of distinct varieties of roof drains and roof drain cover in Pelham, AL and each is an unique solution to the variety of roof types and their drainage concerns. You must take into consideration the kind of roof, its dimensions, and its roof pitch to be able to pick the most suitable drain. You also should take into account the location of the drain, what amount of rainwater is expected and safe practices when selecting a roof drain for a residence or commercial structure.

Gambrel, dormers, hip and gable roofs shed rainwater water because of gravity. Flat roofs, conversely, accumulate rain water. Until this water is guided out and away from the flat roof , it will most likely create pools of water that could inevitably leak and the amassed weight will subsequently cause compromising the integrity of the structure. That is the reason that roofs with a pitch of less than 2% ought to have roof drains located at the lowest areas on the roof in which water pools and need to be evenly spread throughout the roof surface.

Types of Roof Drains


There are several different alternatives of roof drains. They basically fall into two categories: flat roof drains and pitched roof drains. Pitched roof rainwater drains usually comprise gutters which collect 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 structure or in to sewers. Flat roof drains can be one of three main types: scuppers, inner drains or siphonic drains.

Roof Rainwater Drain Scuppes


Scuppers are situated on a roof's perimeter. Scuppers can also be installed on a balcony or terrace. Small holes are cut into the side of the roof structure so water can flow out and drain the roof surface. Scuppers can hook up to a downspout, or could be extended 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 installed at low places in the roof and attach to interior drainage pipes that route water outdoors or into a sewer system. Several models of internal roof drains have domes, strainers or covers which keep trash from obstructing the roof drain pipe. These kinds of drains operate via gravitational force funneling standing water through the roof drain system. They are constructed from 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 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 that removes air from the system and allows for smaller sized pipe diameters . When all air is eliminated, a negative air pressure in the tail piece of the drain is set up which draws rainwater off the roof siphonically. Although used primarily for flat roofs, siphonic drains can also be set up on pitched roofs.

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