The scuppers are the openings in the outside walls specifically designed to allow water but not debris to wash off your roof.
How do flat roofs drain water.
Puddles or ponding water is water from rainstorms and snow melts that collects on a flat roof and doesn t drain or evaporate after 48 hours.
Calculate drains needed.
For a large roof it is recommended to have drains placed at multiple locations within the area of the roof.
Increasing the angle of a flat roof will always.
How water runs off a roof depends on the amount of rainfall and how quickly it needs to drain.
A flat roof may use interior drains to collect water from the centre of the roof.
A low slope roof tilts slightly downhill from its center or from one side so water rolls off to parapet scuppers and down the hopper downspout.
Flat roofs by their very nature will collect some water when it rains.
The above sizing data is offered as a guide only.
The most critical of these issues is the flat roof drainage systems.
Take the roof s total square footage and divide by the total square footage handled by one drain.
Your building and location can help determine which drain will fit your roof needs.
The one challenge with flat roofing is ensuring proper drainage.
Poor drainage can lead to serious issues with flat roofing from leaks to structural damage.
The main benefit of inner drains is that the system is hidden from view.
Inner roof drains are used on flat roofs and include a low section or channel that collects water and feeds it into a concealed drain that leads to an underground drainage system.
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.
This table is based on zurn s roof drain vertical requirement for horizontal roof areas at various rainfall rates table.
The water pools after days or hours of steady precipitation due to a variety of causes such as a clogged drain or structural issues that inhibit drainage.
Along with the benefits of a flat roof come unique challenges.
It may also void your warranty.
Of course the best designed flat roof has the correct amount of pitch to drain the water off naturally.
Still the function of the two drains is the same.
The drainage system of any roof can be located at the edge or in the middle of the roof.
So if your flat roof is collecting water that doesn t drain or evaporate within 48 hours you will need to fix it.
Inner roof drains.
However excessive ponding threatens your roof.
Water falls on the roof and gravity draws it into the drain and down the.
The result is the number of drains needed.
How to fix ponding on a flat roof depends on the cause of the ponding.
The roof is designed to have a gentle slope towards that drain from where the water is piped away from the walls and foundations.
