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.
Rain pipe roof.
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There are many possible parts of the roof potentially leaking but one of the most common ones is the area around the roof vent.
Gutter downspouts often carry huge amounts of water from a large area of the roof.
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When your roof was installed each vent pipe received a flexible boot to seal water around the round surface of the vent pipe.
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The roof vent pipe is installed cut through the roof and around the pipe attached to the roof is surrounded with rubber boot as insulation for the gap between the pipe and roof.
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This will cause heavy drainage issues from your gutters and downspouts.
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The calculations below are meant for drainage from flat roofs where water are expected to spread over the entire flat roof during rain.
Vent pipe leaks during heavy rain can occur if you have cracks in your vent pipe boot or flashing.
The first step in sizing a roof drain is to calculate the surface area of the roof that the drains will be covering as well as the average hourly rainfall rate at the building location.
Water collected by a rain gutter is fed usually via a downpipe also called a leader or conductor from the roof edge to the base of the building where it is either discharged or collected.
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These boots vary in quality flexibility and longevity.
The next step is to determine each roof area that will be served by a separate leader drain pipe scupper or downspout.
Sizing a roof water drain.