Roof Drains


At this time there are a few different varieties of roof water drains and roof drain strainer in Hartselle, AL and each one is an unique answer to the variety of roof types and their drainage concerns. You must consider the kind of roof, its dimensions, and the roof pitch to be able to pick the most suitable drain. You also need to take into account the location of the drain, what amount of rainwater is anticipated and safe practices when selecting a roof drain for a house or commercial building.

Gable, dormer, mansard and hip roofs shed water due to gravity. Flat roofs, conversely, accumulate water. Unless the water is routed out and away from the flat roof structure, it will most likely create pools that may inevitably leak and the accumulated weight will eventually result in damage to the structure. That is why roofs with a pitch of less than two percent should have roof drains situated in the lowest spots on the roof where water puddles and should be evenly spaced all throughout the roof top.

Kinds of Roof Drains


There are a number of distinct variations of roof drains. They basically fall into two categories: pitched roof drains and flat roof drains. Pitched roof rainwater drains usually consist of gutters that collect rainwater that travels by means of gravity down to the roof edge. Gutters channel this water towards downspouts which steer the water flow down and far away from the structure or into sewer lines. Flat roof drains are one of three main types: scuppers, inner drains or siphonic drains.

Roof Drain Scuppers


Scuppers are situated on the roof's perimeter. Scuppers can also be put in on a balcony or terrace. Small openings are cut into the side of the roof structure so water can empty and drain the roof surface. Scuppers can hook up to a downspout, or could be extended so that water is guided off of the building sides and foundation.

Interior Roof Drains


There are quite a few different kinds of inner drains for flat roofs. These are installed at low spots on the roof and connect to inner drainage pipes that drive water outside or into a sewer system. Several styles of internal roof drains have domes, strainers or covers that keep debris from blocking the roof drain pipe. These types of drains operate via gravity channeling standing water through the roof drain system. They can be made 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 enter the drain system producing pipe space occupied by both air and water. By adding an engineered baffle to the sump of the drain body it creates a siphonic drain that removes air from the system and permits 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 attracts rainwater off the roof siphonically. Although used mainly 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 strainer in and around Hartselle, Alabama, give us a call. We'd be glad to help.