There are three types of drain systems commonly used on flat roofs.
Flat roof drainage pipe.
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The roof drainage outlets and rainwater downpipes are calculated based on the design principles for gravity drainage systems established in ss525 2006 code of practice for drainage of roofs.
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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.
Most flat roofs suffer from poor drain locations or drain levels that are high.
When designing a roof it is essential to pay close attention to where the drains are.
Gutters and down pipes should be adequately sized to deal with storm conditions in accordance with bs en 12056 3.
On many occasions drains are too high and water cannot flow off.
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.
Having sufficient drainage on a flat roof is vital.
Some pipes are too small to handle the volume of the water.
Your building and location can help determine which drain will fit your roof needs.
Inner drains are resistant to freezing but can require careful maintenance to prevent problems.
Flat roofs should be designed to drain the roof to one or two edges towards gutters and outlets.
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Water pooling in a yard can kill grass attract mosquitoes and create mud patches.
Of course the best designed flat roof has the correct amount of pitch to drain the water off naturally.
Install a french drain one of the top yard drainage solutions to divert water away from problem areas.
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The one challenge with flat roofing is ensuring proper drainage.
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There are roof coating products available if there isn t enough slant or slope to accomplish this.
A major maintenance issue shared between all types of roof drains is debris removal.
The calculations below are meant for drainage from flat roofs where water are expected to spread over the entire flat roof during rain.