Roof Drains


At this time there are a number of different types of roof water drains and roof drain downspout in Moulton, AL and each one is a specific approach to the wide range of roof types and their drainage challenges. You should think about the kind of roof, its size, and the roof pitch to be able to select the most suitable drain. You also should think about the location of the drain, how much rainwater is anticipated and safe practices when choosing a roof water drain for a house or commercial structure.

Hip roofs, dormers, gable and mansard roofs shed rainwater water due to gravitational force. Flat roofs, on the other hand, collect water. Until this water is routed out and away from the flat roof structure, it will develop pools of water that may inevitably leak and the amassed weight may eventually cause structural damage. That is why roofs with a pitch of less than two percent ought to have roof drains located in the lowest spots on the roof where water pools and should be evenly spaced all throughout the roof top.

Types of Roof Drains


There are a number of different alternatives of roof drains. They basically fall into two groups: flat roof drains and pitched roof drains. Pitched roof drains normally comprise gutters that accumulate rainwater that passes by means of gravity down to the roof periphery. Gutters direct this water towards downspouts which direct 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 Rainwater Drain Scuppes


Scuppers are situated on a roof's periphery. They can also be placed on a balcony or terrace. Small holes are cut into the side of the roof structure so that water can flow out and drain the roof surface. Scuppers can connect to a downspout, or could be lengthened so that water is guided away from the building sides and foundation.

Inner Roof Drains


There are many types of inner drains for flat roofs. These are installed at low places in the roof and attach to interior drainage pipes that drive water outside or into a sewer system. Several models of internal roof drains have domes, strainers or covers that keep debris from obstructing the roof drain pipe. These kinds of drains operate via gravitational force funneling standing water thru the roof drain system. They can be constructed from PVC, cast iron or cast aluminum.

Siphonic Roof Drains

Siphonic roof drains are a more efficient substitute for gravity drainage. Standard flat roof drainage allows both air and water to go into 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 produces a siphonic drain that removes air from the system and permits smaller pipe diameters . When all of the air is eliminated, a negative air pressure in the tail piece of the drain is established which pulls rainwater 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 downspout in and around Moulton, Alabama, give us a call. We'd be glad to help.