A gravity drainage system on a flat roof differs from the gutter system you find on residential roofs in two key ways.
Internal flat roof drainage.
Or 12 drains required.
To keep damage like leaks from occurring water should not stand on a flat roof for more than 48 hours.
Watch for clogs blockage at the roof drain or scupper.
It is very critical to position drains for maximum effect.
Take the roof s total square footage and divide by the total square footage handled by one drain.
They assist in keeping any debris from clogging the drain.
Breaking down the pros and cons of flat roof drains.
A flat roof may use interior drains to collect water from the centre of the roof.
Roofs of this design will have one or more roof drains or scuppers installed.
Furthermore flat roofs with internal drainage are built to direct water to the central points of the structure with a concave shape the opposite of a pitched roof.
Unlike scupper or gutter drainage systems in which water flows off the side of the roof internal systems allow for drains to be strategically placed throughout a roof deck to ensure water doesn t pool.
So often we find that inner drains are high on the roof causing water to pool around them.
These drains are like the drain at the bottom of your shower except that the roof drain has a larger strainer to protect it from debris.
Most draining systems on flat roofs have a poor design or are not correctly installed.
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Drainage helpers drainage helpers are a good option if you already have a good flat roof drain system but want to provide your system with the ability to move more water if need be.
Drainage ditches are created in the roof in the lower insulated areas.
Poor drainage can lead to serious issues with flat roofing from leaks to structural damage.
There are three types of drain systems on a flat roof.
Inner drains are customizable as an attractive feature of your flat roof.
Unlike other roofing types that are slanted or sloped to allow water to drain automatically flat roofs need a built in drainage system to help remove moisture and debris.
The one challenge with flat roofing is ensuring proper drainage.
On large flat roofs mainly on commercial buildings or large residential complexes you ll likely find internal drainage systems.
At page top and at left our photos show a low slope roof surrounded by a parapet.
There must be some momentum for the water to move into the flat roof drainage system.
The drainage requirements for flat roofs on buildings present some special problems that we describe and illustrate here.
Strainers for inner drains are best when custom made to fit your roof and your particular climate.
For flat roof drainage where you place your drains scuppers and the final material of the roofing is more important.
The result is the number of drains needed.
