Roof Drains


There are a number of distinct types of roof drains and roof drain pipe in Hartselle, AL and each is a specific answer to the wide range of roof types and their drainage concerns. You need to think about the kind of roof, its size, and the roof pitch to be able to pick the most suitable drain. You also should take into account the site of the drain, what amount of rainwater is expected and safe practices when selecting 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, conversely, collect water. Until the water is routed out and away from the roof , it will most likely develop pools that may inevitably leak and the accumulated weight will subsequently cause structural damage. That is why roofs with a pitch of under two percent ought to have roof drains situated at the lowest places on the roof where water pools and need to be uniformly spaced all 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 rainwater drains usually comprise gutters which accumulate rainwater that passes by means of gravity down to the roof edge. Gutters transport this water in the direction of downspouts which route the water flow down and away from the structure or into sewers. Flat roof drains can be one of three main types: scuppers, inner drains or siphonic drains.

Roof Drain Scuppers


Scuppers are located on the roof's periphery. They can also be put in on a balcony or terrace. Small openings are cut in the side of the roof structure so that rain water can empty and drain the roof surface. Scuppers can attach to a downspout, or could be lengthened so that water is directed 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 positioned at low spots on the roof and attach to interior drainage pipes that direct water outdoors or in to a sewer system. Many versions of inner roof drains have domes, strainers or covers that prevent trash from blocking the roof drain pipe. These types 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 Drains

Siphonic roof drains are a more efficient alternative to gravity drainage. Traditional flat roof drainage permits both air and water to enter the drain system creating pipe space which is occupied by both air and water. By incorporating an engineered baffle to the sump of the drain body it produces a siphonic drain which eliminates air from the system and allows for smaller sized pipe diameters to be used. When all of the air is removed, a negative air pressure in the tail portion of the drain is set up which attracts rainwater off the roof siphonically. Though used mainly for flat roofs, siphonic drains can also be installed on angled roofs.

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