Roof Drains


There are a few different types of roof water drains and roof drain pvc in Muscle Shoals, AL and each is a specific approach to the wide range of roof styles and their drainage concerns. You need to look at the type of roof, its dimensions, and its roof pitch to be able to pick the right drain. You also need to take into consideration the location of the drain, what amount of rainwater is expected and safe practices when choosing a roof drain for a house or business structure.

Hip roofs, dormers, gable and mansard roofs shed water thanks to gravity. Flat roofs, alternatively, accumulate water. Until the water is routed out and away from the flat roof , it will create pools that may eventually leak and the accumulated weight may eventually result in compromising the integrity of the structure. That is the reason that roofs with a slope of below two percent should have roof drains located in the lowest areas on the roof in which water pools and need to be evenly spaced all throughout the roof top.

Types of Roof Drains


There are a number of different alternatives of roof drains. They generally fall into 2 groups: pitched roof drains and flat roof drains. Pitched roof drains normally comprise gutters which accumulate rainwater that passes via gravity down to the roof periphery. Gutters transport this water in the direction of downspouts which steer the water flow down and 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 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 connect to a downspout, or can be lengthened so that water is directed away from the building sides and foundation.

Inner Roof Drains


There are quite a few different kinds of inner drains for flat roofs. They are installed at low places in the roof and attach to interior drainage pipes that drive water outside or in to a sewer system. Many models of inner roof drains have domes, strainers or covers which keep trash from obstructing the roof drain pipe. These types of drains operate via gravitational force funneling pooling 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 alternative to gravity drainage. Standard flat roof drainage allows both air and water to enter the drain system producing pipe space occupied by both air and water. By incorporating 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 attracts water off the roof siphonically. Though 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 pvc in and around Muscle Shoals, Alabama, give us a call. We'd be glad to help.